Top Data Annotation Companies in London

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All Data Annotation Specialists in London

Sigli
5
(11 reviews)
Software development, Web development, Data Solutions, AI, ML.
Highly recommended
Sigli is a forward-thinking software development company specializing in digital product development and digital transformation. Our mission, ‘ Data Science with Purpose, Innovation with Impact ’, drives us to transform innovative ideas into practical solutions. Our services encompass the entire development lifecycle, from initial concept to implementation, ensuring every product we build is high-quality, scalable, and future-proof. Sigli assists businesses in navigating the complexities of digital transformation, modernizing their operations, enhancing customer experiences, and maintaining a competitive edge in the ever-evolving digital landscape. Our team's deep expertise, combined with a commitment to leveraging the latest technologies and best practices, ensures we deliver impactful results for our clients. Our dedication to excellence is further demonstrated by our ISO/IEC 27001 certification, the leading standard for Information Security Management Systems (ISMS). This certification underscores our commitment to maintaining the highest standards of information security, making us a trusted partner for businesses looking to thrive in the digital age.
Looking for work in Data Annotation
Located in London, United Kingdom (+2)
From €1,000 for Data Annotation
Worked in Software & Computer Services (+12)
Speaks English, Dutch(+3)
51-200 members
Timspark
5
(3 reviews)
Core Teams for complex builds—custom software, AI/ML, data, cloud, and DevOps.
Top awarded
Timspark is a custom software partner that goes beyond headcount. We curate pre-built Core Teams—architects, engineers, QA, and DevOps with clear ownership—to deliver measurable outcomes, not just CVs. Clients choose us to build modern web and mobile apps, move to cloud-native architectures, implement AI/ML and data platforms, and optimize CI/CD—plus Salesforce integrations and QA. Recent wins span microlearning platforms, cybersecurity scale-ups, IoT telemetry, BIM/point-cloud automation, and pharma analytics. Whether you need team augmentation or end-to-end delivery, we plug in quickly, de-risk execution, and help you scale with confidence. Services: Custom Software • Team Augmentation • Dedicated/Core Teams • Mobile • Cloud & DevOps • AI/ML & Data • Salesforce • QA & Automation.
Looking for work in Data Annotation
Located in London, United Kingdom (+1)
From €3,000 for Data Annotation
Worked in Media (+15)
Speaks English, Armenian(+6)
51-200 members
ConTesta
5
(20 reviews)
Sell More. Live Better.
Highly recommended
Top awarded
We are a 360° marketing agency that provides comprehensive services so that, with a personalised approach, you can grow, evolve and take your business to the next level. We have clients in 8 countries and we speak English, Spanish, French and German. Our speciality is the personalisation of each campaign we execute, whether they are B2B, B2C, SMEs or large companies. We have an interdisciplinary team of experts in Social Media, Influencer Marketing, SEO, SEM, Web Design & Development and Planning . Our goal is to help you sell more so that you can live better. Contact us and we’ll get back to you within 24h.
Looking for work in Data Annotation
Located in London, United Kingdom (+4)
From €300 for Data Annotation
Worked in Technology Hardware & Equipment (+21)
Speaks English, French(+3)
11-50 members
Digismarties
4.9
(7 reviews)
Driving Digital Transformation for Startups and Enterprises Worldwide
Highly recommended
An Innovation driven company providing highly scalable solutions with innovative approaches and advanced methodologies. The company has focused on developing products and providing end-to-end solutions in web application engineering, since 2008. We concentrate on web strategy consulting analysis and web design with seamless integration. We work with clients in a variety of industries on a wide range of web solutions, such as information architecture, creative web design, web analytics, web usability, web strategy, email marketing, database development, search engine marketing, eCommerce solutions, content management systems, web hosting, domain name registrations, mobile application development and many more.
Looking for work in Data Annotation
Located in London, United Kingdom (+2)
From €1,000 for Data Annotation
Worked in Home Services (+6)
Speaks English, Hindi(+1)
51-200 members
Debut Infotech
5
(8 reviews)
Results, Not Promises
Recommended
Debut Infotech is an AI-augmented blockchain and software development company helping organizations across financial services, healthcare, supply chain, and digital platforms build systems that perform reliably in complex, regulated environments. Founded in 2011 and blockchain-native since 2015, the company brings engineering discipline and technology depth to enterprises moving from fragmented pilots to production-grade systems. With delivery centers across the USA, UK, Canada, and India, Debut Infotech combines regional market understanding with globally distributed engineering capability — enabling clients to move with speed, consistency, and governance. Service areas: Artificial intelligence and generative AI — Enterprise LLM integration, AI agent development, retrieval-augmented generation (RAG) pipelines, predictive analytics, computer vision, and intelligent process automation embedded at the system architecture level. Blockchain and Web3 development — Smart contract engineering, DeFi protocol development, real world asset (RWA) tokenization, cryptocurrency exchange infrastructure, and enterprise blockchain on Hyperledger Fabric and Corda. Mobile application development — Native iOS, Android, and cross-platform applications (React Native, Flutter) architected for AI integration, enterprise-grade security, and sustained performance under production load. Web and software development — Full-stack web platforms, SaaS products, and enterprise software systems engineered API-first, designed for long-term maintainability and organizational scale Proven Delivery: $62M+ raised across client platforms including Ifinca, IntegraLedger, Everledger, and TĒM 90% customer success score across enterprise engagements 15 years of enterprise software delivery Fortune 500 clients and high-growth startups across 25+ industry verticals 50–249 engineers spanning AI, blockchain, and software disciplines
Looking for work in Data Annotation
Located in Chandigarh, India (+2)
From €10,000 for Data Annotation
Worked in Others (+11)
Speaks English
51-200 members
ELEKS
5
(1 review)
Your trusted partner for guaranteed software delivery
Top awarded
ELEKS is your trusted partner for guaranteed software delivery. Combining over 30 years of industry insight with cutting-edge AI technology, we help businesses worldwide deliver their unique software vision through bespoke full-cycle solutions.
Looking for work in Data Annotation
Located in Berlin, Germany (+14)
From €20,000 for Data Annotation
Worked in Energy & Oil (+10)
Speaks English, German(+1)
1001-5000 members
Evangelist Apps
4.9
(6 reviews)
UK’s Leading AI, Software & Mobile App Agency
Recommended
Top awarded
At Evangelist Apps, we don’t just build apps, we craft intelligent mobile solutions tailored to business needs. With over two decades of experience, we guide our clients with best practices, smart architecture, and forward-thinking UX/UI. Our team has delivered high-performance apps for some of the world’s most trusted brands including British Airways, BBC, UBS, KLM Airlines, Virgin Money, Channel 4, Hastens, and BMJ. From concept to launch, we deliver quality, agility, and cost-efficiency every time. BTW, we are also an official Microsoft Cloud AI Partner! Whether you’re a startup or an enterprise, we help bring your ideas to life with pixel-perfect design, robust engineering, and unmatched reliability. Why Choose Us • 23+ years of mobile expertise • A seasoned, cross-functional app development team • Agile delivery with regular builds and updates • Cost-effective offshore development without quality compromise • End-to-end ownership from discovery to deployment Our Expertise • Native iOS and Android apps • Cross-platform apps using React Native & Flutter • Clean, user-focused UX/UI design • Scalable backend & API integrations • Dedicated teams for QA, DevOps, and Project Management
Looking for work in Data Annotation
Located in Hampshire, United Kingdom
From €2,000 for Data Annotation
Worked in Banking & Financials (+5)
Speaks English
51-200 members
BRIVOX TECHNOLOGIES LTD
(0 review)
Digital Product Engineering for SaaS, AI and Secure Web Platforms.
BRIVOX TECHNOLOGIES LTD is a UK-registered digital product engineering company building custom software systems for startups, agencies, e-commerce brands, and growing businesses. We specialize in custom SaaS platforms, web applications, dashboards, AI-powered solutions, e-commerce systems, cloud-ready deployment, and cybersecurity-ready digital products. Our work is built around an engineering-first approach: clear product architecture, strong UI/UX, secure backend systems, scalable frontend development, reliable APIs, payment flows, automation, and long-term technical foundations. BRIVOX is best suited for businesses that need more than a basic website — they need a serious technical partner capable of turning ideas, operations, and digital products into reliable software.
Looking for work in Data Annotation
Located in London, United Kingdom
From €400 for Data Annotation
Worked in Software & Computer Services (+3)
Speaks English, Arabic
1-10 members
Future Processing
(0 review)
Achieve your business goals with technology
We are a technology consultancy & software delivery partner .  We advise on the most efficient IT solutions, optimise operations, and drive revenue growth for clients globally. Leveraging our expertise in software and technology, we’ve successfully delivered hundreds of software products for both SMEs and market-leading brands, including Fortune 500 companies. Our approach transforms strategic insights into impactful outcomes, ensuring every solution is designed to deliver measurable business value .  We listen, advise, design and deliver world-class, user-friendly IT products for clients in an agile way. How? Our competences and value-added services are tailored to solve their key business challenges. AI & Automation - Transform into an AI-boosted business. Discover how our services will cut costs, improve productivity, test your ideas, and maximise ROI. Data Science & Engineering - Enrich your data-driven operations, unlock insights, and drive efficiency with modern data science and engineering solutions. Infrastructure & Security - Design and manage resilient infrastructure while strengthening your security posture, including support for regulatory requirements. By shifting from traditional cost-saving to data-driven insights, we prioritise business outcomes. We assist clients with AI & ML, Cloud, Consulting, Cybersecurity, Data Solutions, Digital Product , and Software Development . Get to know us better here: www.future-processing.com
Looking for work in Data Annotation
Located in Gliwice, Poland (+4)
From €1,000 for Data Annotation
Worked in Legal Services
Speaks English, German(+1)
501-1000 members
Hut Eight Digital
(0 review)
Turning complex challenges into digital solutions
We’re a London based team blending custom development, UX/UI design, and performance-driven SEO. We create fast, discoverable, and resilient digital products that deliver results.
Looking for work in Data Annotation
Located in City of London, United Kingdom
From €1,000 for Data Annotation
Worked in Insurance (+3)
Speaks English
11-50 members
Plexteq
(0 review)
Trusted partner for guaranteed software engineering excellence, quality and transparency.
Plexteq is a trusted digital consulting and software engineering company that delivers solutions at the cutting edge of technology, with R&D centers in Ukraine, Estonia and UK. Founded in 2014, Plexteq focuses on professional consulting and end-to-end software engineering services primarily in the SaaS domain. Plexteq customers comprise large and well-known companies operating in the hi-tech, healthcare, telecom, e-government, online conferencing, and data recovery industries, where software innovation is most intense. Plexteq offers its clients across the corporate market, high-quality services in software engineering, software architecture, DevOps, quality assurance, business intelligence, and data engineering to build and deliver next-generation products and digital experiences. Key benefits: - Operational costs reduction and productivity increase through Agile processes that follow CMMv3, ISO/IEC 25010:2011, ISO/IEC 27001:2013 - Flawless integration of teams and processes to minimize downtime and speed execution - End-to-end project oversight and management, ensuring issues are identified and managed before they become problems
Looking for work in Data Annotation
Located in Tallinn, Estonia
From €3,000 for Data Annotation
Worked in Energy & Oil (+6)
Speaks English, Estonian(+3)
51-200 members
DevArion Solution
(0 review)
Transforming business with vision
DevArion Solution is a full-service digital technology company dedicated to helping businesses innovate and grow in today’s fast-paced digital world. Founded in 2025, we partner with startups, SMEs, and enterprises to transform their ideas into reliable and scalable solutions. We specialize in delivering a complete range of services including web and mobile application development, UI/UX design, custom software engineering, e-commerce solutions, cloud integration, and data-driven analytics. Our approach is built on a deep understanding of our clients’ challenges ensuring every solution we create is practical, innovative, and aligned with their business goals. At DevArion Solution, we believe in combining creativity, technology, and strategy to deliver products that not only look great but also perform seamlessly. Whether it’s building a user-friendly app, modernizing enterprise software, or developing a data platform that drives insights, our mission is to create digital experiences that truly make an impact. What sets us apart is our commitment to quality, transparency, and long-term partnerships. With a talented team and a client-first mindset, we go beyond code to deliver measurable results and lasting value. From idea to execution DevArion Solution is your trusted technology partner for end-to-end digital innovation.
Looking for work in Data Annotation
Located in Lahore, Pakistan
From €3,000 for Data Annotation
Worked in Hospitals & Healthcare (+1)
Speaks English
11-50 members

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