Best Software Performance Optimization Companies in the UK

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    Targets we’ve achieved:
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    Increased US Software Development Company's annually acquired clients by 400% *
    Generated 50+ business opportunities for UK Architecture & Design Services Provider *
    Reduced cost per lead by over 6X for Dutch Event Technology Company *
    Reached out to 13,000 target prospects and generated 400 opportunities for Swiss Sports Tech Provider *
    Boosted conversion rate of Ukrainian IT Company by 53.6% *
    AI Summary
    Sergii Steshenko
    CEO & Co-Founder @ Lengreo

      Introduction

      In today’s fast-paced digital world, slow or inefficient software can significantly impact business performance. That’s where software performance optimization companies come in. Based in the UK, these specialists help businesses enhance the speed, reliability, and scalability of their software systems – whether it’s improving load times, reducing downtime, or fine-tuning backend processes. In this article, we explore the top UK-based firms that excel in optimizing software for peak performance.

      1. LenGreo

      1. LenGreo

      We provide a mix of digital marketing and development services in the UK and Central Europe, working with B2B companies to help improve their online presence and performance. Our website development work includes front-end design that aligns with usability, speed, and performance goals. By focusing on both strategy and execution, we support businesses in building digital platforms that are functional and scalable across devices.

      Alongside development, we offer SEO, lead generation, and content services, which contribute to the performance and visibility of customer-facing applications. We take a practical approach by integrating with internal teams and focusing on clear communication, helping improve the overall delivery and consistency of front-end systems and related marketing channels.

       

      Key Highlights:

      • Works with B2B clients on digital strategy and development
      • Offers front-end website development with performance in mind
      • Supports lead generation and online visibility through SEO and content
      • Available for in-person collaboration in Central Europe and UK

       

      Services:

      • Front-end website development
      • SEO and on-site optimisation
      • B2B digital marketing strategy
      • Content and social media marketing
      • Lead generation and appointment setting
      • Paid advertising and demand generation

       

      Contact and Social Media Information:

      • clutch logo
      • trustpilot logo
      Our cases
      SEO for BIM & VDC Services Provider
      SEO for BIM & VDC Services Provider
      PPC For Adult Content Platform
      PPC For Adult Content Platform
      Biological Age Blood Testing Kit
      Biological Age Blood Testing Kit
      2. Simple ITS

      2. Simple ITS

      Simple ITS provides IT services and support for home users and small businesses in Greater Manchester. Their work covers a wide range of clients including law firms, call centers, letting agencies, distribution companies, and accountants. They offer IT solutions with a focus on reliability and direct communication. Their engineers bring hands-on experience in solving both hardware and software issues, along with managing IT infrastructure for day-to-day operations.

      While not strictly focused on front-end development, their services touch on areas such as system support and optimization that can impact user-facing software performance. They assist clients in maintaining consistent operations, ensuring their technology setup supports business productivity. The team works closely with clients to deliver practical IT solutions and minimize disruptions in service.

       

      Key Highlights:

      • Operates across Greater Manchester
      • Works with small businesses in sectors like legal, distribution, and property
      • Focuses on IT reliability and infrastructure support
      • Provides experienced, hands-on technical engineers

       

      Services:

      • IT support for businesses and home users
      • Network setup and maintenance
      • Hardware and software troubleshooting
      • System optimization and monitoring
      • Data backup and recovery

       

      Contact Information:

      • Website: simpleits.co.uk
      • E-mail: support@simpleits.co.uk
      • Address: Seymour Grove Manchester, M16 0FJ
      • Phone: 07759 222418

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        3. Scott Logic

        3. Scott Logic

        Scott Logic is a UK-based software consultancy that develops custom software solutions for large organizations. Their teams work closely with clients to design and build scalable systems, often integrating front-end and back-end components with a focus on performance, usability, and maintainability. They use short development cycles to create software that evolves based on user feedback and business needs.

        In the context of front-end development, they handle the delivery of responsive interfaces and data-driven applications. Their consultants often collaborate with internal teams to improve digital platforms, making them more efficient and reliable. Their work emphasizes clear communication, frequent iteration, and alignment with client goals.

         

        Key Highlights:

        • UK-wide presence with 400+ consultants
        • Custom software delivery across sectors
        • Emphasis on iterative development and collaboration
        • Engages in performance-oriented front-end work

         

        Services:

        • Custom front-end and back-end software development
        • UI/UX development and optimization
        • Agile consulting and delivery practices
        • System integration and modernization
        • Technical architecture and design

         

        Contact Information:

        • Website: www.scottlogic.com
        • LinkedIn: www.linkedin.com/company/scott-logic-limited
        • Address: 6th Floor, The Lumen St James Boulevard Newcastle Helix Newcastle upon Tyne NE4 5BZ
        • Phone: +44 20 3787 4085
        4. Redgate

        4. Redgate

        Redgate focuses on database management solutions that support DevOps processes and improve software delivery across organizations. Their products help teams automate deployment, manage test data, and monitor performance, especially in environments with complex data requirements. While their core work is in backend systems and databases, their impact often extends to front-end performance by supporting stable and efficient data operations.

        Their tools are used by development and operations teams to manage data more effectively, reduce errors in release processes, and ensure compliance. By improving the stability of the database layer, they indirectly support user-facing application performance, especially in systems where data speed and availability are critical.

         

        Key Highlights:

        • Focus on DevOps and database management
        • Tools that integrate across development and operations
        • Supports stable application performance through backend optimization
        • Used across industries with complex data needs

         

        Services:

        • Database deployment automation
        • Test data management
        • Performance monitoring for data systems
        • Compliance and risk management
        • DevOps toolchain integration

         

        Contact Information:

        • Website: www.red-gate.com
        • E-mail: info@red-gate.com
        • Facebook: www.facebook.com/RedGateSoftwareTools
        • Twitter: x.com/redgate
        • LinkedIn: www.linkedin.com/company/red-gate-software
        • Address: Cavendish House Cambridge Business Park Cambridge CB4 0XB United Kingdom
        • Phone: +44 (0)1223 420 397
        5. Agilisys

        5. Agilisys

        Agilisys works with public sector organisations across the UK, providing a mix of software products and IT services. Their work includes support for modernising citizen-facing platforms, improving internal systems, and managing infrastructure and cloud services. While their primary focus is not front-end development, their solutions often involve user-facing digital tools aimed at improving accessibility and usability for public services.

        They also assist in strategic consulting and automation, helping local governments deliver more responsive and secure digital experiences. Their role in software performance optimization is tied to broader systems integration and digital transformation initiatives, including projects that require careful coordination between front-end interfaces and backend processes.

         

        Key Highlights:

        • Works primarily with the UK public sector
        • Offers both software products and IT service delivery
        • Focus on modernising digital public services
        • Engages in cloud and infrastructure management

         

        Services:

        • Strategic IT consulting
        • Software development and automation
        • Front-end updates for citizen-facing portals
        • Managed services and infrastructure support
        • AI-enabled tools for public sector workflows

         

        Contact Information:

        • Website: www.agilisys.co.uk
        • E-mail: info@agilisys.co.uk
        • LinkedIn: www.linkedin.com/company/agilisys
        • Address: Scale Space, 2nd floor, Imperial College White City Campus, Scale, 58 Wood Ln, London W12 7RZ, UK
        • Phone: +44 845 450 1131
        6. NA Software

        6. NA Software

        NA Software is a UK-based company focused on scientific and technical software development, with particular expertise in signal processing and performance-intensive applications. Their work supports sectors such as defence and aerospace, where real-time data handling and processing are essential. Though their services are mostly centered around backend algorithms and hardware efficiency, their expertise contributes to improving system-wide performance, which can impact front-end responsiveness in complex applications.

        They also create and maintain optimised libraries and custom APIs that support high-speed operations across various hardware platforms. Their approach to software performance is deeply technical, often addressing processing bottlenecks and ensuring smooth integration between different system layers, which indirectly affects the performance of user-facing components in specialised applications.

         

        Key Highlights:

        • Works with defence and aerospace sectors
        • Develops high-performance DSP libraries and tools
        • Focuses on backend optimisation and hardware efficiency
        • Experienced in cross-platform software support

         

        Services:

        • Custom software for signal processing
        • DSP library development and integration
        • Hardware-specific performance tuning
        • Software consultancy for scientific applications
        • Processor migration and conversion support

         

        Contact Information:

        • Website: www.nasoftware.co.uk
        • E-mail: marketing@nasoftware.co.uk
        • Address: 115 Lovell House, 412 The Quadrant, Birchwood Park, Warrington, Cheshire. WA3 6FW. UK.
        • Phone: +44 1925 811114
        7. Technosoftwares

        7. Technosoftwares

        Technosoftwares provides enterprise-level software development services, including systems for process automation, resource planning, and client management. Their work includes building large-scale applications with integrated front-end interfaces that connect to back-office systems. They offer cross-platform development, ensuring that software solutions are accessible across devices and environments.

        In addition to front-end work, they support backend infrastructure, automation tools, and compliance requirements. Their staff augmentation service allows clients to scale development teams flexibly. Their role in software performance optimization is seen in how they design and maintain scalable front-end solutions and ensure consistent performance through DevOps and QA processes.

         

        Key Highlights:

        • Offers enterprise-level software systems
        • Supports front-end and back-end integration
        • Provides staff augmentation for development needs
        • Focuses on cross-platform compatibility

         

        Services:

        • Front-end application development
        • ERP, CRM, and project management tools
        • DevOps and CI/CD pipeline support
        • Mobile and web compatibility solutions
        • Security and compliance services

         

        Contact Information:

        • Website: technosoftwares.com
        • E-mail: sales@technosoftwares.com
        • Phone: +44-204-577-1819
        8. Northdoor

        8. Northdoor

        Northdoor provides data-focused technology services that support businesses in managing and protecting their information. Their work covers the full data lifecycle, from creation and governance to storage and analysis. While their core focus is on infrastructure, security, and analytics, their role can extend into software performance optimization by improving data access, system integration, and platform responsiveness that support front-end applications.

        They help organisations maintain well-structured, accessible data systems that are available for use in customer-facing software and internal platforms. This contributes to more consistent user experiences and better system performance overall. Their services are shaped around practical business needs and supported by partnerships with major IT vendors.

         

        Key Highlights:

        • Focused on end-to-end data management and security
        • Works across industries with structured and unstructured data
        • Engages in platform optimisation and system integration
        • Partners with large-scale technology vendors

         

        Services:

        • Data governance and compliance support
        • Application and infrastructure consultancy
        • System security and risk mitigation
        • Analytics and AI integration
        • Managed services and platform optimisation

         

        Contact Information:

        • Website: www.northdoor.co.uk
        • E-mail: info@northdoor.co.uk
        • Facebook: www.facebook.com/Northdoorplc
        • Twitter: x.com/Northdoorplc
        • LinkedIn: www.linkedin.com/company/northdoor-plc
        • Address: 3rd Floor, Bentima House 168-172 Old Street London, EC1V 9BP United Kingdom
        • Phone: 020 7448 8500
        9. DigitilizeWeb

        9. DigitilizeWeb

        DigitilizeWeb is a UK-based company focused on website development, mobile apps, and e-commerce platforms. They build and maintain front-end applications that align with modern design and usability standards. Their work supports clients looking to strengthen their digital presence through responsive websites, mobile compatibility, and reliable user interfaces.

        They also offer services such as digital marketing and web maintenance, which contribute to long-term performance and visibility. Their approach includes adapting to changing web trends and ensuring that sites remain fast, secure, and easy to navigate across devices.

         

        Key Highlights:

        • Works on front-end web and mobile development
        • Provides services to improve user engagement and site performance
        • Offers continuous web maintenance and updates
        • Supports e-commerce and digital marketing needs

         

        Services:

        • Front-end website design and development
        • Mobile app development
        • E-commerce platform setup
        • Web performance maintenance
        • Digital marketing and SEO support

         

        Contact Information:

        • Website: www.digitilizeweb.com
        • E-mail: info@digitilizeweb.com
        • Facebook: www.facebook.com/DigitilizeWeb
        • Twitter: x.com/digitilizeweb
        • LinkedIn: www.linkedin.com/company/digitilizeweb
        • Instagram: www.instagram.com/digitilizeweb
        • Address: Office 327 Broadstone Mill Broadstone Road Stockport, England SK5 7DL
        • Phone: +447947430685
        10. Testhouse

        10. Testhouse

        Testhouse focuses on software performance optimization and quality assurance for organizations across various sectors. They work with businesses in finance, healthcare, energy, retail, and public sectors, applying test frameworks that match specific industry needs. Their methodology is built around automation, aiming to shorten testing cycles while maintaining comprehensive coverage. They prioritize integrating quality into all phases of development, aligning testing strategies with both technical and business objectives.

        Their approach supports continuous delivery by embedding quality at each step of the DevOps lifecycle. This includes early and late-stage testing, aiming to reduce defects and improve traceability. Testhouse emphasizes reusable components and tools to accelerate processes without compromising standards, making their services adaptable to a wide range of software development environments.

         

        Key Highlights:

        • Works across multiple sectors including finance, healthcare, energy, and public services
        • Uses automation and reusable accelerators to speed up testing
        • Embeds quality into the DevOps lifecycle
        • Supports shift-left and shift-right testing
        • Aligns testing with business and technical outcomes

         

        Services:

        • Software performance optimization
        • Automation testing
        • Continuous delivery support
        • Quality engineering consulting
        • DevOps lifecycle integration
        • Test strategy development and implementation

         

        Contact Information:

        • Website: www.testhouse.net
        • Facebook: www.facebook.com/pages/Testhouse
        • Twitter: x.com/testhouseuk
        • LinkedIn: www.linkedin.com/company/testhouse
        • Instagram: www.instagram.com/testhouse
        • Address: Level 18, 40 Bank Street, Canary Wharf, London E14 5NR, United Kingdom
        • Phone: +44 20 8555 5577
        11. Application Performance

        11. Application Performance

        Application Performance is a UK-based software consulting company that focuses on improving the speed and reliability of applications and websites. They combine their in-house software with third-party tools to help clients monitor, analyse, and optimise application performance. Their work supports front-end systems by identifying bottlenecks and improving user-facing response times through better resource management and code-level insights.

        They do not offer fixed service packages but instead assess each client’s technical environment to apply suitable solutions. Their work contributes to improving front-end performance by supporting the overall infrastructure and application architecture. This includes tools and techniques aimed at enhancing responsiveness and maintaining system health across different platforms.

         

        Key Highlights:

        • Based in the UK with global client support
        • Focus on custom performance monitoring and optimisation
        • Uses both in-house and external software tools
        • Addresses code-level and infrastructure-level issues

         

        Services:

        • Application performance monitoring
        • Front-end and backend optimisation
        • Code quality analysis
        • Infrastructure health checks
        • Custom tool integration and consulting

         

        Contact Information:

        • Website: www.applicationperformance.com
        • E-mail: info@applicationperformance.com
        • Facebook: www.facebook.com/applicationperformance
        • Twitter: x.com/appperf
        • LinkedIn: www.linkedin.com/company/application-performance-ltd
        • Address: Centaur House  Ancells Business Park  Ancells Road Fleet  GU51 2UJ 
        • Phone: +44 (0)330 3230571
        12. Square Root Solutions

        12. Square Root Solutions

        Square Root Solutions provides software development services across the UK with a focus on building scalable, high-performance applications. Their front-end work includes developing responsive web and mobile interfaces aligned with modern user expectations. They use Agile development and certified engineering practices to deliver structured, multi-platform software for startups, SMEs, and enterprise clients.

        They support the full lifecycle of application development, including UI design, testing, version control, and performance optimization. Their front-end development is backed by systems designed for speed and flexibility, contributing to consistent performance and usability across devices. Their teams work closely with UK-based clients to maintain project transparency and timely delivery.

         

        Key Highlights:

        • Offers full-cycle software development for UK businesses
        • Uses Agile methods and ISO-certified practices
        • Focuses on front-end responsiveness and scalability
        • Supports multi-platform deployment

         

        Services:

        • Front-end web and mobile app development
        • UI/UX design and testing
        • Cloud-native application services
        • Microservices and multi-platform support
        • Project management and version control

         

        Contact Information:

        • Website: square-root.co.uk
        • E-mail: info@square-root.co.uk
        • Facebook: www.facebook.com/squareroot.ie
        • Twitter: x.com/squareroot_ie
        • LinkedIn: ie.linkedin.com/company/square-root-solutions
        • Address: 55 Lordship Rd, London N16 0QJ, United Kingdom
        • Phone: +44 2034 688802
        13. Red Oak Consulting

        13. Red Oak Consulting

        Red Oak Consulting works with organisations that require high-performance computing (HPC), cloud, and research computing solutions. Their services are aimed at clients with complex computing needs, including those running scientific and data-heavy workloads. While they focus more on backend performance, their infrastructure support can impact front-end applications by enabling smoother data flow and reduced processing delays.

        Their approach includes technical consulting, cost modelling, and risk management to support large-scale digital transformation projects. They help clients plan and deliver systems that meet performance targets, which can include applications that rely on front-end interfaces for data access and interaction. Their work supports long-term performance and operational efficiency across computing platforms.

         

        Key Highlights:

        • Focus on HPC and research computing services
        • Works with clients in scientific and technical sectors
        • Supports performance-focused infrastructure planning
        • Certified in cloud and security standards

         

        Services:

        • HPC and cloud computing consulting
        • Infrastructure performance planning
        • Digital transformation support
        • Cost modelling and financial planning
        • Risk mitigation and technical strategy

         

        Contact Information:

        • Website: www.redoakconsulting.co.uk
        • E-mail: info@redoakconsulting.co.uk
        • Twitter: x.com/redoakHPC
        • LinkedIn: www.linkedin.com/company/red-oak-consulting
        • Address: 36 Pure Offices Cheltenham Office Park Hatherley Lane Cheltenham GL51 6SH United Kingdom
        • Phone: +44 (0)1242 806 188
        14. Sollers Consulting

        14. Sollers Consulting

        Sollers Consulting is a software integration and advisory firm that works with insurers, banks, and leasing companies. Their projects often involve helping clients modernise systems and adopt digital solutions. While their focus is primarily on large-scale system transformation, they also contribute to front-end development through tools like their RIFE™ platform, which enables the rapid delivery of new insurance products and improves the customer-facing experience.

        They collaborate with various technology providers and operate internationally, including in the UK. Their role in software performance often involves improving system architecture and integration to ensure stable and efficient front-end functionality. This includes projects where fast delivery and configurability are important for customer platforms.

         

        Key Highlights:

        • Works with financial institutions and insurers
        • Supports technology integration and digital transformation
        • Involved in both back-end and front-end system improvements
        • Operates across multiple countries including the UK

         

        Services:

        • Front-end platform implementation (e.g. RIFE™)
        • Software integration and system configuration
        • Digital transformation advisory
        • Low-code development for product delivery
        • Partnerships with global tech providers

         

        Contact Information:

        • Website: sollers.eu
        • E-mail: contact@sollers.eu
        • Facebook: www.facebook.com/SollersConsulting
        • Twitter: x.com/sollers_
        • Instagram: www.instagram.com/sollersconsulting
        • Address: 14 Cullum Street, EC3M 7JJ London
        15. Qualitest

        15. Qualitest

        Qualitest is a quality engineering company offering testing and digital assurance services. Their work includes performance testing, automation, and quality control for applications across multiple industries. Although testing is their core area, their services impact front-end development by improving application responsiveness, reducing defects, and ensuring consistent user experience across platforms.

        They also offer digital engineering services, including DevOps and enterprise application support. These activities help improve release cycles and front-end stability in complex systems. By working with AI and automation, they support businesses in maintaining quality at scale while keeping user interfaces functional and accessible.

         

        Key Highlights:

        • Focuses on quality engineering and performance assurance
        • Offers digital and enterprise engineering services
        • Works across industries including finance and tech
        • Provides support for front-end performance through testing

         

        Services:

        • Front-end and UI testing
        • Automated QA processes
        • DevOps integration
        • Application performance testing
        • Enterprise software engineering support

         

        Contact Information:

        • Website: www.qualitestgroup.com
        • Facebook: www.facebook.com/Qualitestgroup
        • Twitter: x.com/QualiTest
        • LinkedIn: www.linkedin.com/company/qualitest
        • Instagram: www.instagram.com/lifeatqualitest
        • Address: Level 2, Equitable House 47 King William Street EC4R 9AF

        Conclusion

        Software performance optimization plays a key role in ensuring applications run smoothly, load quickly, and meet user expectations across devices. In the UK, a range of companies offer services that support this goal-from front-end development and user interface improvements to backend integration, quality assurance, and infrastructure planning. Each company brings its own focus and methods, but all contribute to the broader objective of delivering efficient, reliable digital experiences. Choosing the right partner depends on specific needs, technical environments, and long-term goals.

        AI Summary