159 software engineer jobs found

Rate: £470 per day Inside IR35 Location: Hybrid with occasional onsite attendance in Newcastle or Manchester Clearance: Active SC Clearance or eligibility to obtain SC Clearance required Contract Type: Contract Overview We are seeking an experienced SFIA Level 4 Software Engineer to join a high-profile public sector delivery programme. The successful candidate will be a strong full-stack engineer with extensive experience across Java-based Back End technologies and modern web development frameworks. You will work within agile, multidisciplinary teams to design, develop, test, and deliver scalable digital services supporting critical government and public sector initiatives. Key Responsibilities Design, develop and maintain high-quality software solutions across the full technology stack. Build and enhance Back End services using Java and Spring-based technologies. Develop and maintain RESTful APIs and microservices architectures....

OB Collective develops independent verification technology for organisations operating in government, regulated and high-assurance environments. Our work is concerned with establishing reliable evidence about information and automated actions before organisations rely on them.   We’re building a senior technical team for a six-to-twelve-month engagement on a UK public-sector R&D programme focused on the cybersecurity and operational assurance of AI agents. We’re looking for a Senior Software Engineer – AI Agent Integrations to develop the integrations connecting agent environments and enterprise systems with our existing verification capability.   As AI agents gain access to organisational data, credentials, tools, APIs and enterprise systems, organisations need stronger ways to understand what agents are permitted to do, what systems they can access and the actions they actually perform. The programme will extend an existing...

About Us: Based in San Francisco, California, Turing is the world’s leading research accelerator for frontier AI labs and a trusted partner for global enterprises deploying advanced AI systems.   Turing supports customers in two ways: first, by accelerating frontier research with high-quality data, advanced training pipelines, plus top AI researchers who specialize in software engineering, logical reasoning, STEM, multilinguality, multimodality, and agents; and second, by applying that expertise to help enterprises transform AI from proof of concept into proprietary intelligence with systems that perform reliably, deliver measurable impact, and drive lasting results on the P&L.   Project Overview: As a Software Engineering evaluator, you will create cutting-edge datasets for training, benchmarking, and advancing large language models, collaborating closely with researchers. This includes curating code examples, providing precise...

Rate: £470 per day Inside IR35 Location: Hybrid with occasional onsite attendance in Newcastle or Manchester Clearance: Active SC Clearance or eligibility to obtain SC Clearance required Contract Type: Contract Overview We are seeking an experienced SFIA Level 4 Software Engineer to join a high-profile public sector delivery programme. The successful candidate will be a strong full-stack engineer with extensive experience across Java-based Back End technologies and modern web development frameworks. You will work within agile, multidisciplinary teams to design, develop, test, and deliver scalable digital services supporting critical government and public sector initiatives. Key Responsibilities Design, develop and maintain high-quality software solutions across the full technology stack. Build and enhance Back End services using Java and Spring-based technologies. Develop and maintain RESTful APIs and microservices architectures....

Embedded within a dedicated feature squad, you will build cross-functional expertise across business domain logic, core applications, data architecture, and underlying infrastructure while collaborating with domain architects, principal engineers, and key business partners to align platform performance with organisational goals. In this role, you will execute backlog items through Agile workflows to craft durable, future-proof software, balancing deliberate architecture with experimental design and hands-on prototyping. Additionally, you will engineer scalable systems around a foundation of automated testing, building, and deployment using continuous execution patterns. Key Responsibilities Architect and deliver robust, highly available distributed systems using Agile practices. Drive CI/CD excellence, automating build, test, and deployment workflows with executable patterns. Prototype emergent designs alongside principal engineers, balancing intentional...

  Start of main content         Search     Senior Software Engineer - £day rate (outside IR35) Red Badger   London Freelance Apply now           Job details Here’s how the job details align with your profile .   Job type Freelance         Full job description Joining a new project Ideally have worked on Financial Services Projects before (Payments would be...

About The Role Alignerr is building a dataset of expert tasks that train and evaluate advanced AI agents on real enterprise engineering work. As a Task Author, you will design and calibrate authentic engineering challenges — diagnosing failing integrations from logs, tracing bugs through codebases, and writing and verifying real fixes — that genuinely push the limits of capable AI agents. London's engineering scene spans fintech, enterprise SaaS, and deep-tech — and this role is built for engineers who operate in that world. If you debug real systems, write infrastructure code, and understand what a production failure actually looks like, your expertise is exactly what we need. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: Flexible, task-based Key Responsibilities Author realistic engineering task prompts covering integration failures, log-based debugging, bug traces through source code, and...

Embedded within a dedicated feature squad, you will build cross-functional expertise across business domain logic, core applications, data architecture, and underlying infrastructure while collaborating with domain architects, principal engineers, and key business partners to align platform performance with organisational goals. In this role, you will execute backlog items through Agile workflows to craft durable, future-proof software, balancing deliberate architecture with experimental design and hands-on prototyping. Additionally, you will engineer scalable systems around a foundation of automated testing, building, and deployment using continuous execution patterns. Key Responsibilities Architect and deliver robust, highly available distributed systems using Agile practices. Drive CI/CD excellence, automating build, test, and deployment workflows with executable patterns. Prototype emergent designs alongside principal engineers, balancing intentional...

About The Role What if the code you write could directly shape how the next generation of AI understands and generates software? We're looking for Software Engineers in London to build, evaluate, and improve AI-generated code — helping train AI systems to think like real developers. You'll write solutions, review AI outputs, and provide the expert-level feedback that makes AI coding assistants smarter, safer, and more reliable. This is hands-on engineering work at the frontier of AI development — not theoretical, not bureaucratic, and not boring. This is a fully remote, flexible contract role. If you can write clean code and explain your reasoning, we want to hear from you. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: 10–40 hours/week What You'll Do Write, debug, and optimize code across a range of languages, frameworks, and problem domains Review and evaluate AI-generated code for correctness,...

Key Accountabilities Responsibilities will include: · Design, develop and maintain highly available, secure, and performant backend REST API services along with frontend client using Python , Golang, Docker and Cloud-Native services . · Implement and manage database schema changes using Liquibase , ensuring alignment with compliance and audit standards. · Collaborate closely with Architecture and DevOps teams to enhance, maintain and mature Product capabilities/features. · Perform root cause analysis and implement solutions for incidents and performance bottlenecks. Qualifications and experience The ideal candidate for this role will have the below experience and qualifications: · Bachelor’s or Master’s degree in Computer Science or equivalent industry experience. · Comes from Software Engineering background with infrastructure experience. · 5+ years of development experience...

Key Accountabilities Responsibilities will include: · Design, develop and maintain highly available, secure, and performant backend REST API services along with frontend client using Python , Golang, Docker and Cloud-Native services . · Implement and manage database schema changes using Liquibase , ensuring alignment with compliance and audit standards. · Collaborate closely with Architecture and DevOps teams to enhance, maintain and mature Product capabilities/features. · Perform root cause analysis and implement solutions for incidents and performance bottlenecks. Qualifications and experience The ideal candidate for this role will have the below experience and qualifications: · Bachelor’s or Master’s degree in Computer Science or equivalent industry experience. · Comes from Software Engineering background with infrastructure experience. · 5+ years of development experience with a...

Key Accountabilities Responsibilities will include: · Design, develop and maintain highly available, secure, and performant backend REST API services along with frontend client using Python , Golang, Docker and Cloud-Native services . · Implement and manage database schema changes using Liquibase , ensuring alignment with compliance and audit standards. · Collaborate closely with Architecture and DevOps teams to enhance, maintain and mature Product capabilities/features. · Perform root cause analysis and implement solutions for incidents and performance bottlenecks. Qualifications and experience The ideal candidate for this role will have the below experience and qualifications: · Bachelor’s or Master’s degree in Computer Science or equivalent industry experience. · Comes from Software Engineering background with infrastructure experience. · 5+ years of development experience with...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Fullstack Experience Tech Stack - Kotlin Backend, JS/TS React Frontend Start date ASAP Duration 6 months (Likely to extend) 2/3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of

About The Role What if your machine learning expertise could directly influence how the most advanced AI systems in the world think, reason, and write code? We're looking for experienced ML engineers in London to evaluate AI-generated machine learning solutions — catching errors, improving quality, and helping frontier AI models get genuinely better at one of the hardest things they do. This is a fully remote, flexible contract role. Work asynchronously on your own schedule, from wherever you are. No fixed hours, no meetings — just high-impact, expert work that matters. Organization: Alignerr Type: Hourly Contract Location: Remote (UK-based) Commitment: Flexible, project-based What You'll Do Review and evaluate AI-generated machine learning code — including Python, TensorFlow, PyTorch, and scikit-learn — for correctness, efficiency, scalability, and clarity Write high-quality ML solutions to modeling, data processing,...

**Don't use auto apply. Please email us***   Optific+   Initial 2–3 month contract, potential to extend or go full-time UK based, ideally London. Elsewhere in the UK is fine if you can get to London for team days.   About us Optific+ is building the AI intelligence layer for optical businesses. Optical groups have their information scattered across practice management systems, tills, reporting tools and documents. We connect those sources and let teams ask questions about their business in plain language, with every answer cited back to the source record. We are moving into enterprise pilots and need someone to own the technical implementation of them.   The role Your first focus is a pilot with a multi-site optical group. You will work out how to get at their data, build the integration, map it into something we can query reliably, configure the product around the agreed use cases and keep it working through the...

Location: UK Remote (GMT timezone) Department: Engineering Employment Type: Contract (B2B)   About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done.   About the role As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and enthusiastic. You should be skilled in...

Role description Location: London (Hybrid – 3 days onsite, mandatory) Employment Type : Permanent | Fixed-Term Contract | Contract (Inside IR35) Start Date : Immediate/ Short Notice period About the Role We are seeking a Senior Platform Engineer (AI, AWS & Developer Experience) to help design and build the platform from the ground up. This is a hands-on engineering role focused on AWS-native application development, internal developer platforms, agentic AI, automation, and engineering governance. You will create the tools, APIs, developer workflows, AI services, and platform capabilities that accelerate software delivery while embedding security, compliance, and operational excellence by default. Key Responsibilities Build cloud-native platform services, APIs, developer tooling, and automation on AWS. Design and develop AI-powered engineering capabilities using AWS Bedrock and agentic AI frameworks. Create reusable platform...

About The Role What if the code you write could directly power the AI systems shaping how millions of people interact with technology? We're looking for Back End Developers based in London to design, build, and optimize the server-side systems and APIs that drive cutting-edge AI products — from data pipelines and model-serving infrastructure to scalable microservices that handle real-world traffic at scale. This is a fully remote, flexible contract role. Whether you're a seasoned engineer looking for meaningful project work or a strong developer ready to apply your skills to AI-adjacent infrastructure, this is your chance to build things that matter. Organization: Alignerr Type: Hourly Contract Location: Remote Commitment: 10–40 hours/week What You'll Do Design, develop, and maintain robust back end services, APIs, and data pipelines Build scalable, high-performance server-side architecture to support AI training and inference...

Senior SC Cleared AI Engineer | Defence | Remote (Contract) Remote (UK) with occasional client site visits £550-£650 per day with extensions up to 1 year Initial 6-Month Contract Active SC Clearance & Current BPSS Required Elenta is seeking an experienced Senior AI Engineer to support the delivery of AI solutions across Defence and secure Government environments. You'll be responsible for designing, developing, deploying, and supporting production-grade AI solutions whilst working closely with technical teams and customer stakeholders. The role requires a strong engineering mindset, with the ability to design and deliver robust solutions from ambiguous requirements whilst maintaining high standards of documentation, security, and code quality. You will work across AI platforms, concept applications, proof-of-value solutions, and production systems, helping shape ideas from early-stage concepts through to operational deployment....