31 senior software engineer jobs found in London

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...

Senior Software Engineer | :£950/day Outside IR35 | 6-months initial contract | London Industry: Trading Location: London - 4 days in office Job Type: Contract - 6-month initial Our client is building the next generation of execution and order management (EMS/OMS) infrastructure for global commodities trading. You will join a small, fast-moving engineering team designing and delivering a cloud-native trading platform from the ground up, tightly integrated with risk, pricing, and market data systems to support high-performance trading environments. This is a senior, hands-on role for an engineer who wants end-to-end ownership — from low-level protocol integration through to distributed execution services and trader-facing tooling. What You’ll Be Doing Design and build core components of a modern EMS/OMS platform, including order routing, order lifecycle management, venue connectivity, and execution analytics. Implement and maintain FIX protocol and...

Senior Software Engineer - Geospatial Data (Contract) Location: Farnborough (3 days per week onsite) Contract Length: Initial 3-month contract IR35 Status: Outside IR35 Security Clearance: All candidates must be eligible for security clearance prior to appointment click apply for full job details

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.

Opportunity for a Senior Software Engineer to work for a retail company near Manchester going through a large digital transformation. This is an initial 6-month contract outside IR35 to help deliver re-platforming of existing systems to an event-driven MACH architecture. Skills: TypeScript, Node, React AWS, Lambdas Event-driven MACH architecture CI/CD In return they're offering an initial 6-month outside IR35 contract paying up to £500/day. If you're interested and would like to know more, please apply through this advert and I'll be in touch.

Senior Java Developer / AI Engineer - Design & Build Payment Product / Fintech / Banking. Spring Boot, Claude/Codex also essential. ANY PAYMENT PRODUCT CONSIDERD from Current Account OR SAVINGS OR ISA's OR Fixed Term Deposits, Lending etc. £600-£650/DAY OUTSIDE IR35 PAY. Our Fintech Challenger Bank client based in Central London seeks a dynamic, eager to learn and technically astute Java Software Engineer who has extensive experience in Designing & Building a Payment Product *NOT PAYMENT PLATFORM* so the ideal candidate will come from for e.g. a Challenger Bank or Fintech Payment Product Company. STRONG skills in Java, Spring Boot, AI (Claude or Codex), working in a Fintech Payment domain. YOU WILL NOT BE CONSIDERED IF YOU DO NOT HAVE FINTECH & DESIGN & BUILD PAYMENT PRODUCT EXPERIENCE WITH JAVA, SPRING & STRONG AI! Our client is hiring a hands-on SENIOR Software Engineer / Java Developer to support delivery and development of Savings products...

Senior Software Engineer 📍 Leeds (3 Days On-Site) | 💰 £400/day Outside IR35 We're supporting a growing UK business on the search for a Senior Software Engineer to play a key role in the evolution of their bespoke CRM platform. This is an opportunity to join a business at an exciting stage of growth. With ambitious plans to double revenue, expand internationally and pursue acquisitions, technology sits at the heart of the next phase of the journey. Working directly with the Founder and wider business teams, you'll be responsible for developing new CRM functionality, automating manual processes and removing operational bottlenecks that impact the business day-to-day. What You'll Be Doing Developing and extending a bespoke CRM platform built in PHP Working closely with business stakeholders to gather requirements and identify opportunities for improvement Building solutions across areas such as stock management, job scheduling and workflow automation...

Senior AI Engineer | Agentic AI / Machine Learning | UK | Contract Conquer AI is hiring Senior AI Engineers. We’re looking for hands-on engineers who can build practical AI systems that solve real operational problems for enterprise clients. This is an Outside IR35 contract working on greenfield AI projects for enterprise clients. This is not a pure ML research role. It’s applied, product-minded, and delivery-focused. You’ll work on systems that extract information, reason over documents, automate workflows, connect into business tools, support decision-making, and reduce manual effort for client teams. You’ll be close to clients, close to the problem, and close to the code. What you’ll work on: Agentic AI workflows LLM-powered applications RAG and knowledge systems Document extraction and classification Workflow automation API and system integrations Client-facing prototypes and production builds Internal Conquer AI product development What...

Senior AI Engineer (LLM/Agentic AI) | London (Hybrid) | £600–£700/day | Outside IR35 | 6 months Role: Senior AI Engineer (LLM/Agentic AI) Location: London (Hybrid – 1 day per week onsite in Victoria) Rate: £600–£700 per day IR35 Status: Outside IR35 Duration: 6 months (extension likely) Project Overview You'll join a major AI transformation programme within a global organisation focused on building production-grade AI systems at scale. The initiative spans both customer-facing AI products and internal business transformation, with a strong emphasis on delivering systems that are deployed, used, and continuously improved. We're seeking a Senior or Lead Machine Learning Scientist to design, build, and deploy AI agents and LLM-powered systems in real-world production environments. The team is building next-generation AI solutions using Large Language Models, Agentic AI, Retrieval-Augmented Generation (RAG), and intelligent automation to...

Principal/Lead Engineer Python/Cloud/Terraform/IAM/DevOps/infrastructure-as-a-code IaC Rate: Circa £600 - £700 PD (Outside IR35), 6 months Location: London/Hybrid x2 days 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 foundations. 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 lasting impact. Role & Responsibilities Technical Leadership...

Senior Databricks Architect/Lead Databricks Engineer - Salesforce Data Architecture exp is a MUST Remote (UK) £700/day Outside IR35 Initial 12-Month Contract | Long-Term Programme | Poosible Extension We're seeking an exceptional Senior Databricks Architect with a strong hands-on Data Engineering background to join a major long-term transformation programme. This is not a pure architecture role. You'll be a Databricks specialist who remains close to the technology, designing and building enterprise-scale data solutions while driving engineering excellence across critical data platforms. You'll take ownership of delivering robust, scalable, and production-grade data solutions within a modern Databricks ecosystem, ensuring platforms are governed, secure, maintainable, and optimised for long-term growth. Key Responsibilities Architect, build and optimise enterprise-grade data solutions within Databricks Design and...

Principal / Lead Engineer Python / Cloud / Terraform / IAM / DevOps / infrastructure-as-a-code IaC Rate: Circa £600 - £700 PD (Outside IR35), 6 Months Location: London / Hybrid x2 days 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 foundations. 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 lasting impact. Role &...

🚀 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...

Senior Databricks Architect/Databricks Engineer- Contract- Remote Rate- £700/day Outside IR35 Work from Home Duration- 12 months minimum (with possible extensions) This is a Senior Databricks hands-on Architect who is a Databricks engineer by trade. This is a long-term contract engagementto provide dedicated data engineering depth within the Databricks and Shared IEP Services data layer, owning delivery across these workstreams and ensuring the resulting pipelines and schemas are production-grade, governed, and maintainable by the permanent team. The contractor will operate primarily within the Databricks and Shared IEP Services data layer, owning data engineering delivery across three areas: 1) Product data ingestion - Building and maintaining daily pipelines from content and assessment products into the shared back-office data layer. 2) AI feature enablement - Designing and maintaining the schemas and data pipelines that power LLM-based features (GenAI...

Tech Lead - Python / Financial Modelling / AI - Pensions £650 - £750 per day Outside IR35 6 Month Contract Remote (Occasional London Travel) Overview I'm currently working with a leading financial services technology consultancy that is looking to bring in an experienced Tech Lead to support the delivery of modern software solutions for a major pensions client. This role sits at the intersection of financial modelling and modern engineering, supporting the development of platforms used for forward-looking financial analysis, including discounted cashflow projections and Monte Carlo simulations. This is a hands-on leadership role, splitting your time between full-stack engineering and leading a team of senior developers. You'll also play a key role in shaping AI-assisted and agentic development workflows, helping embed these approaches into day-to-day engineering practices. The Role You will lead a team of four experienced engineers while...

Senior Data / ML Platform Engineer Contract | Outside IR35 | London - Hybrid £600-£700 (negotiable) DW Search is partnering with a rapidly growing organisation undertaking a significant data and machine learning transformation. We're looking for a senior engineer who can help bridge the gap between data engineering, platform engineering, and machine learning operations. This role focuses on building the systems, workflows, and infrastructure that enable machine learning models to move from experimentation into reliable production use. This is not a research or modelling role. Instead, you'll work closely with Data Scientists and engineering teams to productionise machine learning workflows, improve platform capabilities, and build scalable foundations for future AI and ML initiatives. What you'll be doing Build and optimise production-grade data and machine learning pipelines Develop feature engineering workflows that support model training and...

Senior Python Engineer | FinTech | UK Based- Fully remote | Outside IR35 We're partnering with an innovative and rapidly growing fintech organisation that is transforming the way small businesses manage their finances .As a Senior Python Engineer, you'll play a key role in designing, building, and scaling backend services within a modern microservices architecture. You'll collaborate with product, data, web, and mobile teams to deliver robust solutions while mentoring fellow engineers and driving engineering excellence . What You'll Be Doing Designing, building, owning and scaling cloud-native backend services Working across the full software development lifecycle in an agile environment Collaborating with Product Managers and stakeholders to shape technical solutions Building and integrating RESTful APIs Contributing to architecture decisions and technical best practices Mentoring engineers and supporting team growth Ensuring systems are reliable,...

Principal / Lead Engineer Python / Cloud / Terraform / IAM / DevOps / infrastructure-as-a-code IaC Rate: Circa £750 - £800 PD (Outside IR35), 6 Months Location: London / Hybrid x2 days 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 foundations. 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 lasting impact. Role &...

Tech Lead - Python/Financial Modelling/AI - Pensions £650 - £750 per day Outside IR35 6 Month Contract Remote (Occasional London Travel) Overview I'm currently working with a leading financial services technology consultancy that is looking to bring in an experienced Tech Lead to support the delivery of modern software solutions for a major pensions client. This role sits at the intersection of financial modelling and modern engineering, supporting the development of platforms used for forward-looking financial analysis, including discounted cashflow projections and Monte Carlo simulations. This is a hands-on leadership role, splitting your time between full-stack engineering and leading a team of senior developers. You'll also play a key role in shaping AI-assisted and agentic development workflows, helping embed these approaches into day-to-day engineering practices. The Role You will lead a team of four experienced engineers while remaining actively involved in the...