13 senior software engineer jobs found in London

Senior Software Engineer - APIs & Integration (Azure & Kafka) Contract Length: 6 months Initial Rate: £500-£525 per day Location: Remote IR35: Outside We're supporting a major cloud transformation programme and are looking for an experienced API Architect to help modernise a critical enterprise platform. This role is focused on transforming a large API estate, migrating services from on-premise infrastructure into Azure, and evolving a monolithic architecture into a modern, scalable, event-driven ecosystem. This is a hands-on architecture role where you'll work closely with engineering teams to define architectural standards, guide implementation, and support the delivery of a long-term modernisation strategy. The Opportunity You'll play a key role in: Leading the migration of business-critical APIs from on-premise environments into Azure Defining and driving API architecture across a complex technology landscape Decomposing a large API monolith into...

Software Engineer (Golang) - Contract 6 months initial | Outside IR35 | Remote (occasional travel to Manchester/London) | BPSS required Client: Pixel Global (DWP) We're looking for a Golang Software Engineer to drive automation and process optimisation across a major government programme What you'll be doing: Building in Golang, creating frameworks to enable scalable automation Working with stakeholders to pilot and embed repeatable automated processes Shaping automation approaches aligned to defined standards (TS Red Lines) Challenging manual processes and identifying where automation adds real value What we need: Strong Golang development experience Experience building automation frameworks or tooling Confident engaging stakeholders and challenging existing processes Ability to assess automation vs manual trade-offs This is an immediate impact role with strong extension potential beyond 2026. Please click on the link to apply, for consideration.

Software Engineer (Golang) - Contract 6 months initial | Outside IR35 | Remote (occasional travel to Manchester / London) | BPSS required Client: Pixel Global (DWP) We 're looking for a Golang Software Engineer to drive automation and process optimisation across a major government programme What you 'll be doing: Building in Golang, creating frameworks to enable scalable automation Working with stakeholders to pilot and embed repeatable automated processes Shaping automation approaches aligned to defined standards (TS Red Lines) Challenging manual processes and identifying where automation adds real value What we need: Strong Golang development experience Experience building automation frameworks or tooling Confident engaging stakeholders and challenging existing processes Ability to assess automation vs manual trade-offs This is an immediate impact role with strong extension potential beyond 2026. Please click on the...

I have partnered with a top-tier business intelligence provider who are looking for a Senior .NET/Angular contractor to help them out over their next few sprints. 💷 Up to £500 per day (Outside IR35) 🏢 once a week in London office (mandatory) 📅 3 initially with possibility of extension 🧐 Focus: working on highly performant web apps ad backend systems as well as integration across multiple services and databases. ⚙️ Skills: Angular, .NET Core 7/8, API development, MongoDB, MySQL, Entity, AWS, Claude & Cursor 👉 Advantageous skills: knowledge of Python/Gen AI application and database deployment ❗ Must have UK right to work and be able to commute to London once a week.

🚀 𝗦𝗲𝗻𝗶𝗼𝗿 𝗔𝗜 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿 / 𝗔𝗜 𝗧𝗲𝗰𝗵 𝗟𝗲𝗮𝗱 - 𝗖𝗹𝗮𝘂𝗱𝗲 I𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁𝗮𝘁𝗶𝗼𝗻 🚀 📍 London (Hybrid) 📅 Start Date: ASAP ⏳ Initial 3-6 Months (multiple contracts) 💰 Outside IR35 - rate depending on experience I'm working with a consultancy delivering multiple AI engineering engagements for enterprise clients looking to accelerate software delivery through AI-native engineering practices. We're looking for experienced engineers who have worked hands-on with Claude Code and can help engineering teams adopt AI-assisted development at scale. 🔑 The Role 👉 Roll out Claude Code across engineering organisations and delivery teams 👉 Build custom agents and AI-powered workflows to improve software delivery 👉 Embed alongside engineering teams to drive adoption and best practice 👉 Accelerate technical design, code review, testing and SDLC processes 🎯 Requirements 👉 Strong Software Engineering background 👉 Excellent Python experience 👉 Hands-on experience with Claude Code,...

Senior Data & ML Engineer Contract - Outside IR35 - Initial 6 month contract £650-£750 per day London - Hybrid working We are partnering with a rapidly growing financial services business that is investing heavily in its machine learning and data platform capabilities. This is a hands-on engineering role focused on helping Data Science teams build, deploy, and scale machine learning solutions in production. The work sits at the intersection of data engineering, machine learning engineering, and MLOps, with a strong focus on production systems, feature engineering, workflow orchestration, and model lifecycle management. What you'll be doing Design and build scalable data and feature engineering pipelines to support machine learning workloads Work closely with Data Scientists to operationalise models and improve the end-to-end machine learning lifecycle Develop and optimise PySpark-based data processing workflows and training pipelines Build and...

Senior Front End Engineer, React, Next, AWS, based West London, Hybrid working, 2 days week on site. Outside IR35. 6 months initial, likely extensions. The Role Create extremely well-crafted Front End web applications using React.js and NextJS Support and Develop Server Side Rendered web applications, making use of AWS Lambda Write resilient code that will be continuously tested, deployed and performed at scale Test Front End application e2e with unit, functional, integration, visual regression and lighthouse testing Cross functional Agile team, building high traffic eCommerce and Service web applications Contribute to technical direction and the improvement of its tools and processes Ensure that the code written is performant, resilient, secure and well monitored and alerted web applications Skills Solid commercial experience in React/Redux development Good understanding of development best practices such as TDD, continuous integration and continuous...

Senior AI Engineer (Contract) Rate: £700 / day IR35 Status: Outside IR35 Duration: 6 months (with high likelihood of extension) Location: Hybrid / Remote options available (UK-based) Security Clearance: DV Cleared The Role We are looking for a Senior AI Engineer to design, build, and deploy production-ready GenAI applications and multi-agent systems within secure environments. This role requires a strong hybrid of advanced AI orchestration and robust cloud-native engineering, specifically focusing on scaling workloads via Kubernetes. Because of the nature of this work, you must hold active UK Developed Vetting (DV) security clearance to be considered. Key Responsibilities Agentic Workflows: Design, implement, and optimize multi-agent frameworks and stateful LLM applications. Kubernetes Orchestration: Containerize, deploy, and scale AI models, APIs, and microservices across production Kubernetes (K8s) clusters. Infrastructure &...

Senior Data Engineer Location: London (Hybrid Working) Type: Contract Pay Rate: £350-£400 (Outside IR35) We're looking for a Senior Data Engineer to join a high-performing data team responsible for delivering scalable, reliable, and innovative data solutions that power analytics and decision-making across a global streaming and digital ecosystem. This is an opportunity to work with modern cloud technologies, large-scale datasets, and a collaborative engineering culture where you'll help shape the future of data platforms used by millions of customers worldwide. What You'll Be Doing Design, build, and support scalable data models and distributed ETL pipelines using modern big data technologies. Collaborate with stakeholders across multiple business functions to understand data challenges and translate requirements into robust technical solutions. Champion DataOps principles, engineering best practices, and continuous improvement initiatives....

Lead Platform Engineer Python | Cloud | Terraform | IAM | DevOps | Infrastructure-as-Code (IaC) Rate: Circa £700–£800 per day (Outside IR35) Contract Length: 6 Months Location: London / Hybrid (2 days per week) Overview We are seeking an experienced Principal / Lead Engineer to join a highly ambitious organisation building a large-scale, mission-critical data and technology platform. This is a unique opportunity to join at the earliest stages of a major programme and play a key role in shaping its technical foundation. Working closely with the CTO and a small team of senior engineers, you will lead the design and implementation of core infrastructure, establish engineering standards and practices, and make architectural decisions that will have long-term strategic impact. If you enjoy solving complex technical challenges, influencing technology strategy, and creating robust engineering foundations, this role offers an exceptional opportunity to make a...

🚀 Senior Front-End Engineer – Investment Banking | Contract Upto £800 p/d (Outside IR35) | London / Hybrid (1 Day/Week in Office) We are partnering with a global investment bank to hire a Senior Front-End Engineer to join a flagship team delivering a next-generation, single-page application (SPA) platform for high-performance derivatives trading. This is a high-profile role on a mission-critical, front-office system with exceptional technical standards. You’ll work at the cutting edge of financial technology, contributing to a modern, reactive web platform used across trading desks. This is not your typical enterprise UI – it’s fast, data-intensive, and built to scale with real-time demands in a trading environment. 💼 The Opportunity Collaborate with elite engineers on a SPA used across the investment bank for derivatives trading. Build elegant, high-performance UIs with real-time data updates and functional programming paradigms. Shape a front-end...

My client is seeking an experienced Contract Site Reliability Engineer Team Lead to join their team. This is a hands-on leadership role requiring a strong technical background alongside the ability to lead, mentor, and develop a high-performing SRE function. There will be occasional travel to the client's offices in Central London. Responsibilities of the Site Reliability Team Lead Provide technical leadership for the Site Reliability Engineering function, driving reliability, scalability, and performance improvements across critical production systems. Lead, mentor, and coach a team of SREs and engineers, fostering a culture of operational excellence, collaboration, and continuous improvement. Remain hands-on with the design, implementation, and support of cloud infrastructure, automation, observability, and platform reliability initiatives. Define, implement, and govern SLOs, SLIs, and error budgets, ensuring alignment between engineering priorities and business...

Joining a cross functional Delivery team (software engineers, delivery, QA, UX, design) Client is in financial services domain ILarge platform and product build inc. customer journeys. Ideal start date 23rd July 2026 6 months contract - likely to extend £day rate / outside IR35 2 days / week in person working Immediate interviews. Red Badger Founded in 2010 by Stuart, Cain and David, we help large organisations improve their speed to market whilst focusing on delivering value to their users and customers. We work with our clients to understand their problems and validate ideas in order to deliver improved process efficiencies, strategic enhancements and new digital products and services (or make significant improvements to existing ones). The best bit about Red Badger is, of course, the team. We've been around for 10+ years now and we are 100 strong. We are really proud of our people; we support and learn a lot from each other; we work really hard...