21 back end developer jobs found in London

Waracle are looking for a Senior Mobile Security Developer (Inside IR35) for an exciting new 6-month initial contract joining our world-class digital technology consultancy, home to a diverse, smart, curious and ambitious community of specialists in technology-driven transformation.   We work with ambitious clients to help them solve their biggest business and customer challenges. We help our clients to innovate and create intelligent digital products and services. We thrive on complex challenges and deliver business-critical IT transformation projects, moving seamlessly from strategy, design and delivery to operations.   This is a UK-based Inside IR35 Contract role, offering the flexibility to balance your professional and personal life, with 2 days a week spent connecting with colleagues in our London or Edinburgh office or on client site. The Role As a Senior Mobile Security Developer, you will define squad-level technical architecture...

Waracle are looking for a Senior Mobile Security Developer (Inside IR35) for an exciting new 6-month initial contract joining our world-class digital technology consultancy, home to a diverse, smart, curious and ambitious community of specialists in technology-driven transformation.   We work with ambitious clients to help them solve their biggest business and customer challenges. We help our clients to innovate and create intelligent digital products and services. We thrive on complex challenges and deliver business-critical IT transformation projects, moving seamlessly from strategy, design and delivery to operations.   This is a UK-based Inside IR35 Contract role, offering the flexibility to balance your professional and personal life, with 2 days a week spent connecting with colleagues in our London or Edinburgh office or on client site. The Role As a Senior Mobile Security Developer, you will define squad-level technical architecture...

Waracle are looking for a Senior Mobile Security Developer (Inside IR35) for an exciting new 6-month initial contract joining our world-class digital technology consultancy, home to a diverse, smart, curious and ambitious community of specialists in technology-driven transformation.   We work with ambitious clients to help them solve their biggest business and customer challenges. We help our clients to innovate and create intelligent digital products and services. We thrive on complex challenges and deliver business-critical IT transformation projects, moving seamlessly from strategy, design and delivery to operations.   This is a UK-based Inside IR35 Contract role, offering the flexibility to balance your professional and personal life, with 2 days a week spent connecting with colleagues in our London or Edinburgh office or on client site. The Role As a Senior Mobile Security Developer, you will define squad-level technical architecture...

AI Data Scientist (12 Month Day Rate Contractor) Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions, and deliver sustainable, high-quality solutions. We value engineering excellence, pragmatic problem-solving, and strong collaboration across technology, business, and risk. We offer technologists the opportunity to build lasting careers, deepen...

Posted 1 hour ago  Contract  Competitive     AI Engineer - 12 Month Day Rate Contract Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions, and deliver sustainable, high-quality solutions. We value engineering excellence, pragmatic problem-solving, and strong collaboration across technology, business, and...

Automation Tester (Day rate contract) Contract Type Day Rate Contractor Closing Date 18 November, 2026 Job Category Tech, Data and Digital Business Unit Quality Assurance (UKTX-Q) Location London, United Kingdom Posted on 19 October, 2026 Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions,...

Principal Information Security Consultant (Day rate Contract) Contract Type Day Rate Contractor Closing Date 18 November, 2026 Job Category Tech, Data and Digital Business Unit Information Security & Privacy (UKTI) Location London, United Kingdom Posted on 19 October, 2026 Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to...

Job Title: AI Roku Developer Location: London Company: BritBox International Reporting to: SVP of Technology and Content Delivery Contract Type: Day rate Contractor, 3-month About Us BBC Studios’ Direct-to-Consumer (DTC) business brings premium content directly to North American audiences through two distinctive streaming brands: BritBox and BBC Select. BritBox , the ultimate streaming destination for British TV. We offer an unparalleled collection of thoughtfully curated entertainment—cleverly crafted and full of the charm, wit, and heart that define British storytelling. Born from the BBC, our mission is to bring authentic British stories to our audiences. Launched in 2017, we are a small but mighty streamer that punches above our weight—available on every major platform and even featured among the bright lights of Times Square—and we’re just getting started. BBC Select is a documentary streaming service that has been...

Network Solution Architect/Technical Lead Location: London (2-3 days/Hybrid) Job Overview We are seeking an experienced Network Solution Architect/Technical Lead to lead the end-to-end design, delivery and implementation of enterprise network solutions across LAN, WAN, WLAN, Data Centre, SD-WAN, Security and Cloud environments. The successful candidate will act as the technical authority, ensuring network solutions are scalable, secure, resilient and aligned with business requirements and technical standards. Key Responsibilities Lead network architecture, solution design and technical governance across enterprise infrastructure projects. Develop, review and approve High-Level Designs (HLDs), Low-Level Designs (LLDs) and technical documentation. Provide technical expertise across LAN, WAN, WLAN, Data Centre, SD-WAN, Security and Cloud connectivity. Conduct requirements gathering, project scoping, technical assessments and risk analysis. Review...

We’re on a mission to back the UK’s small businesses like no one else Small businesses are the backbone of the economy, and we’re here to help them win. We’ve built a platform that uses clever data to get them the funding they need in minutes, not weeks.   At Funding Circle, we have the restless energy of a fintech start-up with the stability of a public company. It’s a unique mix that gives Circlers the autonomy to take ownership and the scale to make an impact that truly counts.   We’re a high-performing team that chooses to lift each other up. We challenge, we champion, and we have each other’s backs - because we know that when we stand together, we move faster and build better.   The impact is real: Last year alone, the businesses on our platform generated £7.2bn for the UK economy Come and join a mission that matters! [Read our Impact Report] | [See our Trustpilot]  ...

Forward Deployed AI Engineer Location:  London, United Kingdom. Contract:  Freelance, with the possibility of future full-time employment. About the job: AI is forcing engineers to evolve like never before. The role is increasingly defined by deciding what a system should do and which specs and evals to write, then handing execution to agents and carefully checking what comes back. The best engineers we know still understand every layer underneath and are eager to spend more time thinking about how and why the solutions they build get used. That’s who we want to work with at Calibr, a startup founded by  Peter Wood  and  Marlene Leiss , and part of The Apprentify Group, one of the UK’s leading AI and tech training providers. We build tailored AI solutions for companies going through AI transformation, then help their teams build the skills to run, extend and own those systems themselves. As a Forward Deployed AI Engineer,...

AI Engineer - 12 Month Day Rate Contract Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions, and deliver sustainable, high-quality solutions. We value engineering excellence, pragmatic problem-solving, and strong collaboration across technology, business, and risk. We offer technologists the opportunity to build lasting careers, deepen their...

The Bank of England is the UK 's central bank. Our mission is to deliver monetary and financial stability for the British people.   The Bank of England is a diverse organisation. Each of its 4,000 people are committed to public service and dedicated to promoting the good of the people of the United Kingdom by maintaining monetary and financial stability.   As a Senior Data Engineer , your main responsibilities will be: Refactor legacy applications and data workflows into scalable, maintainable and reusable components aligned with modern engineering standards. Design, build and optimise end-to-end data pipelines for reliable ingestion, transformation, processing and delivery of large-scale datasets. Modernise existing ETL/ELT processes, improving performance, resilience, scalability and maintainability. Develop modular, production-quality code with strong testing, version control and CI/CD practices. Integrate applications and data...

AI Engineer - 12 Month Day Rate Contract Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions, and deliver sustainable, high-quality solutions. We value engineering excellence, pragmatic problem-solving, and strong collaboration across technology, business, and risk. We offer technologists the opportunity to build lasting careers,...

We’re on a mission to back the UK’s small businesses like no one else Small businesses are the backbone of the economy, and we’re here to help them win. We’ve built a platform that uses clever data to get them the funding they need in minutes, not weeks.   At Funding Circle, we have the restless energy of a fintech start-up with the stability of a public company. It’s a unique mix that gives Circlers the autonomy to take ownership and the scale to make an impact that truly counts.   We’re a high-performing team that chooses to lift each other up. We challenge, we champion, and we have each other’s backs - because we know that when we stand together, we move faster and build better.   The impact is real: Last year alone, the businesses on our platform generated £7.2bn for the UK economy Come and join a mission that matters! [Read our Impact Report] | [See our Trustpilot]   The...

Business Operations Transformation Consultant (Contract) About the role Tecknuovo has grown quickly, and many of the processes, controls and ways of working that support our business have evolved organically alongside that growth. As we look ahead, we want to take a more deliberate approach to how our internal business operations work together, ensuring we have the right foundations to support our next stage of growth. Our business operations remit extends beyond our core corporate functions of Legal, Governance, Risk and Compliance (GRC), IT, People and Finance. It also includes the operational infrastructure supporting our consultant community, quality assurance, frameworks and accreditations, business systems, suppliers, health and safety, and facilities. While these areas are functioning, ownership and responsibilities have developed across different teams over time. This has created opportunities to improve how processes connect, clarify accountability, reduce...

Salesforce Developer (12m Day Rate Contractor) Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions, and deliver sustainable, high-quality solutions. We value engineering excellence, pragmatic problem-solving, and strong collaboration across technology, business, and risk. We offer technologists the opportunity to build lasting careers, deepen...

Digital Product Owner - Mobile (12 month contract) Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions, and deliver sustainable, high-quality solutions. We value engineering excellence, pragmatic problem-solving, and strong collaboration across technology, business, and risk. We offer technologists the opportunity to build lasting careers,...

Location: UK-based - Remote (Course Delivered Virtually). Two required visits to the office in London Term: Freelance: 16 weeks, Monday to Friday. Core programme hours are 10:00am – 4:00pm with availability required from 9:00am – 5:00pm Salary: £200 per day Contract type: 16 Weeks Fixed term   Coding Black Females Coding Black Females was established in 2017 to address the underrepresentation of black women in tech. We are a non-profit organisation with the aim to grow and inspire the community of black female developers. We are the largest network of black female developers in the UK.   Mission Our mission is to grow the community of black women in software development and technical roles, from entry level to executive level. We will remove the barriers to enter the industry and progress within roles.   Aim Our main aims are: Build the community by removing barriers, showcasing talent and...

Salesforce Developer (12m Day Rate Contractor) Job Introduction Handelsbanken combines a long-established relationship banking model with secure, resilient, and customer-focused technology. Our technology teams enable the Bank's decentralised way of working, delivering systems built for stability, trust, and long-term value. We are on a multi-year technology and digital transformation journey to enhance customer experience and improve how colleagues work together. By modernising platforms, simplifying processes, and better connecting data and systems, we help relationship teams focus on customers and less on complexity. Our decentralised culture extends to technology. Teams are trusted to take ownership, make informed decisions, and deliver sustainable, high-quality solutions. We value engineering excellence, pragmatic problem-solving, and strong collaboration across technology, business, and risk. We offer technologists the opportunity to build lasting careers, deepen...