23 back end engineer jobs found

Back-end Engineer (contract) Opus have partnered with an cutting-edge AI focused HealthTech start-up with a mission-driven culture and ethical AI approach. The successful candidate will be making a real impact to patient care outcomes.  Contract Specifics: Rate: £400 per day, Outside IR35 Duration: 3 months  Start date: ASAP, Immediate starter  Working Patterns: Full-time, 1 day p/w in London-offices. Essential:  Confident working across data infrastructure, distributed systems, APIS and AI-services  Proven experience in building/designing scalable backend services Strong experience building and maintaining APIs (REST, GraphQL and/or gRPC). Knowledge of Docker and AWS (ideally in a recent project) Essential - must have strong coding skills in Python, Typescript, Node and SQL. Nice to have: Docker, ECS, Kubernetes or similar container platform experience  Familiarity with Django frameworks and IaC (e.g. Terraform)  Experience with the deploying and operating ML or...

Back End Engineer (contract) Opus have partnered with an cutting-edge AI focused HealthTech start-up with a mission-driven culture and ethical AI approach. The successful candidate will be making a real impact to patient care outcomes. Contract Specifics: Rate: £400 per day, Outside IR35 Duration: 3 months Start date: ASAP, Immediate starter Working Patterns: Full-time, 1 day p/w in London-offices. Essential: Confident working across data infrastructure, distributed systems, APIS and AI-services Proven experience in building/designing scalable Back End services Strong experience building and maintaining APIs (REST, GraphQL and/or gRPC). Knowledge of Docker and AWS (ideally in a recent project) Essential - must have strong coding skills in Python, Typescript, Node and SQL. Nice to have : Docker, ECS, Kubernetes or similar container platform experience Familiarity with Django frameworks and IaC (eg Terraform) Experience with the deploying...

Back-end Engineer (contract) Opus have partnered with an cutting-edge AI focused HealthTech start-up with a mission-driven culture and ethical AI approach. The successful candidate will be making a real impact to patient care outcomes. Contract Specifics: Rate: £400 per day, Outside IR35 Duration: 3 months Start date: ASAP, Immediate starter Working Patterns: Full-time, 1 day p/w in London-offices. Essential: Confident working across data infrastructure, distributed systems, APIS and AI-services Proven experience in building/designing scalable backend services Strong experience building and maintaining APIs (REST, GraphQL and/or gRPC). Knowledge of Docker and AWS (ideally in a recent project) Essential - must have strong coding skills in Python, Typescript, Node and SQL. Nice to have : Docker, ECS, Kubernetes or similar container platform experience Familiarity with Django frameworks and IaC (e.g. Terraform)...

Who are OnCommerce?   OnCommerce is a global selling platform that powers a growing network of retail channels, including: OnBuy - The only marketplace in the world to give customers instant Cashback on everything easyShop - An all-new marketplace created in collaboration with the easy® family of brands Comet - The iconic UK tech brand making its return later this year   OnCommerce is growing fast, launching new brands and scaling to power the future of ecommerce.   Be Part of the Story OnCommerce is constantly evolving. Everyone here plays a hands-on role in shaping what comes next, building brands that make an impact across global markets. There’s no red tape or rigid corporate structure; just smart people taking ownership and figuring things out as we build something big together. The pace is fast, priorities shift, things aren’t always perfectly set up, and you’ll often need to get stuck in and...

Join a central government organisation where your Oracle Cloud expertise will maintain critical national infrastructure in a high-security environment. Salary: £550 - 575 per day + Outside IR35 Job Specification: DV Cleared-Oracle Cloud Engineer Employment Type: Full-Time Location: Milton Keynes UK-based working required, 3 days on site in MK Clearance Required: DV (Developed Vetting) Position Type: Contract (Outside IR-35) The Role A central government organisation is seeking to recruit a DV cleared Oracle Cloud Engineer on an initial 3 month contract basis, 2-3 days per week in Milton Keynes (high likelihood of extension), paying £550/day outside IR35 to start asap (potential for increase in rate). Under the applications sits an OCI estate of production and non-production environments, and this role owns keeping that estate healthy, current, recoverable and affordable. Builds are scripted, restores are rehearsed, patching runs to a clock, and there is a...

Join a central government organisation where your Oracle Cloud expertise will maintain critical national infrastructure in a high-security environment. Salary: £550 - 575 per day + Outside IR35 Job Specification: DV Cleared-Oracle Cloud Engineer Employment Type: Full-Time Location: Milton Keynes UK-based working required, 3 days on site in MK Clearance Required: DV (Developed Vetting) Position Type: Contract (Outside IR-35) The Role A central government organisation is seeking to recruit a DV cleared Oracle Cloud Engineer on an initial 3 month contract basis, 2-3 days per week in Milton Keynes (high likelihood of extension), paying £550/day outside IR35 to start asap (potential for increase in rate). Under the applications sits an OCI estate of production and non-production environments, and this role owns keeping that estate healthy, current, recoverable and affordable. Builds are scripted, restores are rehearsed,...

Senior Software Engineer - Kotlin £550-£650 per day | Outside IR35 Hybrid | London (3 days onsite) A leading UK financial services organisation is seeking a Senior Software Engineer to play a central role in a large-scale platform transformation programme. The business is rebuilding a critical part of its digital infrastructure to support a broad range of transaction methods and channels across both in-person and digital environments. This is hands-on Back End engineering at scale, with real ownership and direct exposure to architecture decisions from day one. Key Responsibilities as a Senior Software Engineer: Design and build Kotlin Back End services for a new payments platform Own the architecture and design of key components, taking high-level requirements and turning them into structured, deliverable backlogs Write clean, well-tested, production-ready code that the team can rely on Work closely with Product and Engineering to break down complex...

Technical Lead/Senior Full Stack Developer | .NET, SQL, GDS The Rate - £550 per day IR35 Status - Outside IR35 The Location - UK (remote) The Working Pattern - Remote Duration - August 2026 to late March 2027 About the Client Digital Skills are working with a niche data and public sector technology consultancy supporting a consortium of UK Local Authorities. The programme centres on scaling a secure data platform used for national reporting, policy development and cross-authority data standardisation. About the Role This is a blended Technical Lead and Senior Full Stack Developer role, combining hands-on engineering with delivery leadership. You will own technical direction while actively contributing to development, leading the platform through public Beta in line with GDS standards. Responsibilities A key responsibility for this role is to lead the project as it undergoes GDS Service Assessment. Lead delivery of a GDS-aligned digital service...

ML Engineer (Early Career - Mid-level) New contract role | Immediate starter - Just in! Opus have partnered with an cutting-edge AI focused HealthTech start-up with a mission-driven culture and ethical AI approach. The successful candidate will be making a real impact to patient care outcomes.  Contract Specifics: Rate: £400 per day, Outside IR35 Duration: 3 months  Start date: ASAP, Immediate starter  Working Patterns: Full-time, 1 day p/w in London-offices. Person Specification:  - Solid skills in Python, SQL and AWS.  - Background in Software Engineering / Data Engineering | Previous back-end work is nice to have  - Experience working with ML models (productisation, not just for research / prototyping)  Nice to have:  - A deeper understanding on ML Models / ML Data Science from an API perspective (GraphQL, gRPC, REST)  - Start-up or HealthTech experience.  This is an urgent requirement, please reach out ASAP to Adam Akhtar today (17th July) to avoid missing out! 

ML Engineer (Early Career - Mid-level) New contract role | Immediate starter - Just in! Opus have partnered with an cutting-edge AI focused HealthTech start-up with a mission-driven culture and ethical AI approach. The successful candidate will be making a real impact to patient care outcomes. Contract Specifics: Rate: £400 per day, Outside IR35 Duration: 3 months Start date: ASAP, Immediate starter Working Patterns: Full-time, 1 day p/w in London-offices. Person Specification: - Solid skills in Python, SQL and AWS. - Background in Software Engineering/Data Engineering | Previous Back End work is nice to have - Experience working with ML models (productisation, not just for research/prototyping) Nice to have: - A deeper understanding on ML Models/ML Data Science from an API perspective (GraphQL, gRPC, REST) - Start-up or HealthTech experience. This is an urgent requirement, please reach out ASAP to Adam Akhtar today (17th July) to...

Senior Software Engineer - Kotlin & Coroutines. £500/day LTD CO OUTSIDE IR35. 100% REMOTE. An interest in AI (Agentic AI, AI tooling, Claude, Codex or Co-Pilot) highly advantageous but not essential. We are looking for a Senior Backend Engineer (Kotlin & Coroutines essential) to build the integrations that connect AI companion with senior care and hospital software platforms. In this role, you will design, build, and maintain robust Back End services and integrations that enable seamless data exchange between the company and partner systems. You'll take end-to-end ownership of integration projects-from discovery and architecture through implementation, deployment, and continuous improvement. Key Responsibilities for the Kotlin & Coroutines Developer are: Design, develop, and maintain integrations between my clients platform and third-party healthcare and senior care software systems. Build scalable, secure, and maintainable Back End services and APIs using...

Leading eCommerce client now requires a Senior Backend Engineer to join their Platform Team and contribute towards the design and development of high volume, scalable and resilient E-commerce platforms. The role: Building Back End services and APIs in Node.js. Working with AWS SQS, SNS, and Lambda for event-driven architecture. Practicing TDD and applying DDD to model complex business domains. Collaborating with a platform team on systems handling serious traffic and transaction volume. Key Requirements: Strong senior-level Node.js and TypeScript experience. Hands-on cloud experience with AWS (SQS, SNS, Lambda). Solid API design and development background. Real hands-on experience with TDD and DDD, not just familiarity. Microservices experience, CI/CD, observability tooling. Excellent communicator with a strong background in pair programming and cross functional collaboration. This is an initial 6-month contract role which provides a daily rate...

hackajob is collaborating with Solirius Reply to connect them with exceptional professionals for this role. Front End Engineer - React, Next.js, JavaScript (Remote, Contract - Outside IR35) The Role We are looking for an experienced Front End Engineer on an Outside IR35 contract basis to deliver user-centric digital services for our public sector clients. This is a fully remote role focused on building accessible, performant web applications aligned with GDS standards. You will work within multidisciplinary agile teams to produce production-quality front-end solutions that make a real difference to public services. Key Responsibilities Develop and maintain front-end applications using React and Next.js Build accessible, responsive interfaces compliant with WCAG 2.2 AA and GDS Design System Collaborate with designers, product owners, and back-end engineers in Agile delivery teams Write clean, testable JavaScript/TypeScript with comprehensive unit and integration...

Quality Assurance Engineer 6-month contract Remote Working (UK-based) Outside IR35 £350 to £375 per day Start - ASAP The Opportunity: We are supporting a confidential programme for a major central government project (Government Digital Services) and are seeking an experienced Quality Assurance Engineer to join a multidisciplinary Agile delivery team working on the development of modern, cloud-based data platforms and user-facing digital services. This role is ideally suited to a QA professional with experience testing data-driven systems, validating end-to-end data pipelines and assuring the quality of applications that consume and present complex datasets. You'll work closely with Product Owners, Data Engineers, Developers and Business Analysts to ensure that data is processed accurately, integrations perform reliably and end users receive high-quality, trusted information. Experience with cloud-based data platforms, REST APIs and geospatial...

AI Integration Engineer (Defence & National Security) Location: London (Hybrid) Contract Rate: £600/day (Outside IR35) Requirement: Active UK SC Clearance (Mandatory) We are hiring on behalf of our client, a specialised defence consultancy, who is looking for an AI Integration Engineer with active SC clearance to join them on a contract basis in London. Key Skills Required Active UK SC Clearance (Mandatory - applications without this cannot be considered) Core Engineering: Strong Back End development skills (Python, Go, or C++) with solid API design and data pipeline experience AI Tooling: Hands-on experience integrating LLMs, handling vector databases, and building robust chunking/embedding strategies Secure Architecture: Deploying LLM pipelines, RAG systems, and orchestration layers within secure, classification-bound environments Local Implementations: Self-hosting, optimising, and containerising open-source models (eg, Llama,...

MES Technical Project Manager - 6 months - Outside IR35 - Must be UK Based We are seeking an experienced MES Technical Project Manager to lead large-scale Manufacturing Execution System (MES) and Smart Factory transformation programmes for global manufacturing organisations. Key accountabilities Lead end-to-end MES implementation programmes from initiation through to go-live and hypercare. Manage project scope, timelines, budgets, resources, risks, dependencies, and delivery milestones. Own project governance including RAID management, reporting, steering committees, and executive updates. Lead cross-functional teams including Solution Architects, Developers, Infrastructure Teams, Automation Engineers, QA Teams, and Manufacturing stakeholders. Provide technical leadership across MES architecture, solution design, integration, deployment, and troubleshooting activities. Drive implementation and rollout of GE Proficy MES solutions, including Plant Applications,...

Our Telecoms client is looking for a Project Network Engineer to join their team in Glasgow. This is a 6 months contract initially and the role is outside IR35. Please note that due to the nature of the role candidates are required 5 days per week onsite at offices just north of Glasgow. Key Responsibilities Create and maintain technical documentation and ensure customer networks are documented as part of project handovers Install, configure, fault find, report and maintain routers, switches and firewalls Completion of site surveys to enable installation Rack, charger and telecoms equipment installation and commissioning to an excellent standard Create Health and Safety documentation such as RAMS, POWRA to ensure H&S measures are adhered to. Required Experience Proven experience in monitoring, maintaining, and troubleshooting network and system environments. Strong background in IP networking, including CCNA-level knowledge, WAN, LAN, and...

🚨 Senior Playwright SDET | £700/day | Outside IR35 | Front Office Trading | London I'm working with a leading global investment bank looking to hire an exceptional Playwright SDET to join their Front Office Derivatives Technology team. This isn't your typical automation role. You'll be embedded within a high-performing engineering team, working directly alongside developers on a strategic front end trading platform. The rate reflects the calibre of engineer they're looking for. 💰 Package £700 per day Outside IR35 12-month rolling contract 1 day per week in the London office What they're looking for This role is suited to a highly technical SDET who is passionate about automation and enjoys writing production-quality code. You must have: ✅ Strong commercial experience with Playwright ✅ Excellent coding skills in JavaScript and TypeScript ✅ Experience building and maintaining automation frameworks ✅ Previous experience working on...

Network Infrastructure Engineer needed (Outside IR35) Who we are We are a company looking for an experienced Infrastructure Engineer to join our VPN team on a contract basis (Initial 6 months) with the possibility to go permanent if the fit is right. Where are we? This can be a fully remote role, however we would ideally like someone to be able to commute to our office in Haslingden once or twice a month. Job Spec Key Skills - Networking, Virtualisation, Linux and VPN. Job Responsibilities: Moving internal servers to cloud based software, with full integrated back ups on each A new VPN protocol needs to be built, and integrated into our system which runs on an SQL database. We already have a built VPN system, but using obsolete technology, new script, integrating and testing required on multiple routers Migrating current Radius servers to cloud based rather than hardware based.  IP networking and network engineering, assist...

Azure Data Engineer (Government Digital Services) 6-month contract Remote working (UK) Outside IR35 £475 per day The Opportunity: We are supporting a major public sector organisation on the appointment of an experienced Azure Data Engineer to join a high-profile data and analytics programme on an initial 6-month contract basis. This is a backend-focused Data Engineering role centred on building and maintaining scalable data services, pipelines and platform capabilities using Azure Databricks within a containerised Docker environment. Working within a multidisciplinary data team across Agile delivery environments, you will play a key role in designing, developing and optimising modern cloud-based data solutions that support critical environmental, scientific and operational decision-making across the organisation. This role offers the opportunity to work with large-scale data platforms, geospatial datasets and advanced analytics capabilities, helping to drive...