29 senior software engineer jobs found

Senior Software Engineer - Outside IR35 - Contract (Energy) About the role We are looking for a Senior Software Engineer (ideally with some Data Engineering experience) to join our client team in the energy trading sector. End date is not certain, but likely to be December 2026 or early Q1 2027. We are looking for experience in the following technologies: Microsoft Azure ecosystem Understanding of networking & security options in Microsoft Azure Infrastructure-as-code (preferably Bicep) Python Experience in the below would also be beneficial: Azure DevOps (pipelines) SQL We generally spend 2 days per week on-site with the client in central London (Monday & Thursday). £500-600 per day outside IR35 Start date: 10/08/2026 End date: December 2026 or early Q1 2027 About Softwire Softwire is a leading UK technology and strategy consultancy. From enterprise to government, we help visionary organisations turn...

Java Developer / Software Engineer - Design & Build Fintech Product / Banking - Spring Boot, Claude/Codex also essential. *YOU MUST HAVE BEEN INVOLVED IN DESIGN, ARCHITECTURE AND BUILD OF ANY FINTECH PRODUCT* for e.g. Current Account OR SAVINGS OR ISA's OR Fixed Term Deposits, Lending, Mortgages 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...

Software Engineer/AI Engineer Fintech & Payments Domain. £600-£650/day LTD CO OUTSIDE IR35 PAY 1-2 days onsite London. Our Fintech Financial Service/Banking & Payment Service Client based in Central London seeks a proactive, hands-on Senior Software Engineer & AI Engineer with Claude or Codex & Java Development skills, with a particular importance to solid expertise in Claude or Codex AI Tooling, Agentic AI, Java Development using Spring Boot within a Fintech Payment Domain setting. YOU WILL NOT BE CONSIDERED IF YOU DO NOT HAVE FINTECH & PAYMENTS & JAVA & STRONG AI! The ideal candidate MUST HAVE previous experience working in a startup/scaleup Fintech Financial Services environment. Any ISA product implementation/integration experience is an advantage but not essential. AI skills in Codex, Claude is highly sought as my client is looking for someone who is an AI Enthusiast. Our client is hiring a hands-on Software Engineer/Java Developer to support...

Contract AI Engineer (Claude Code Specialist) Greater Manchester (2-3 days onsite per week) Outside IR35 3 - 6 months (with view to extend) Competitive Market Rate (dependent on experience) ASAP The Role We are seeking an experienced Contract AI Engineer (Claude Code Specialist) to lead the integration and optimisation of Anthropic's Claude Code ecosystem into our development workflows. You will build, fine-tune, and deploy agentic AI coding assistants to accelerate our software delivery. Key Responsibilities Requirements Local to or able to commute to Greater Manchester 2-3 days a week. Experience with automated testing and continuous integration tools. Strong programming skills (Python, TypeScript, or Go preferred). Deep understanding of LLM architectures, prompt engineering, and context management. Direct hands-on experience deploying and configuring Claude Code or similar agentic coding tools. Proven track record as an AI Engineer or...

Senior/Lead Software Engineer (Java) | Outside IR35 | Hybrid (2 Days Onsite in central London) A large retailer urgently seeks an experienced Senior Software Engineer with extensive Java expertise to take a lead role in the design,development and support of scalable, cloud-native Back End applications. Working within an Agile, DevOps environment, you'll help build high-performance microservices, APIs and event-driven solutions powering a next-generation fulfilment platform used at significant scale. This is an exciting greenfield programme, working alongside engineers, operations and product teams to deliver software that supports critical business operations. Essential Experience Extensive commercial experience developing enterprise applications with Java and Spring Boot Proven track record designing and delivering high-throughput, distributed microservices at scale Strong experience building event-driven architectures using Kafka Expertise with PostgreSQL and...

Senior Software Engineer (C++) - Contract Join a globally recognised technology business supporting one of the world 's leading online gaming platforms. This is an opportunity to work on a large-scale, business-critical C++ platform, helping modernise legacy systems while supporting a major cloud migration programme. Role Overview Location: Remote, must be based in UK Package: £600 - £650pd Outside IR35 Duration: 3 months (Sept - Dec) Industry: Technology / iGaming What You'll Be Doing Develop high-quality C++ within a large, established production codebase. Play a key role in migrating core platform capabilities from Windows to Linux as part of a wider modernisation programme. Refactor and modernise legacy components while maintaining stability and existing functionality. Build and enhance high-performance, low-latency, server-side systems supporting a live platform. Integrate platform services with AWS where required as...

Senior Mobile Engineer Tech: Kotlin / Swift / Flutter / BLE / NFC Location: Hybrid (Angel, London – 2 - 4 days per month in office) Contract: Outside IR35 (client is exempt) Duration: 8–12 weeks Start: ASAP Rate: £400 - £525 per day The Opportunity: We're partnering with an innovative IoT technology business looking for a Senior Mobile Engineer to lead the build of a brand-new mobile activation app and SDK. This is a greenfield project, replacing a legacy application with a lightweight solution focused on BLE, NFC and background scanning for enterprise customers. You'll own the project from architecture through to delivery, working directly with the Head of Software in a fast-moving, engineering-led environment. What You'll Do: Build a new mobile app and SDK from scratch Develop BLE background scanning and NFC activation Work on both native iOS and native Android and use Flutter for some basic UI screens. Deliver production-ready...

Azure | Databricks | SQL | Outside IR35 | Hybrid THE COMPANY We 're partnering with a global mining organisation that is investing heavily in the evolution of its enterprise data platform. Following significant growth and a wider transformation programme, they 're looking to bring in an experienced Senior Data Engineer to strengthen the technical capability of the team and support the delivery of several high-profile data initiatives. This is a business that places real value on engineering best practice and is looking for someone who can provide immediate technical expertise, influence engineering standards through delivery and help solve complex data engineering challenges across the organisation. THE ROLE This is a hands-on Senior Data Engineering contract where you 'll operate as a senior individual contributor within a highly collaborative team. Rather than leading people, you 'll lead technically, owning complex engineering problems, partnering with...

Opportunity for Senior Java Engineers to join a software consultancy and play an important role delivering a greenfield project for a large client in the iGaming industry. You’d join a product-based team within a large engineering department and would be responsible for owning all aspects of the systems you work on, from design through to deployment and supporting them in production. You must have prior experience in the iGaming, betting or FS industries. Skills: • Java, Spring, REST APIs, AWS • Microservices and Distributed Systems • Kafka or RabbitMQ • TDD and CI/CD • Observability In return they're offering an initial 6-month outside IR35 contract paying up to £500pd. If youre interested and would like to know more, please apply through this advert and Ill be in touch.

Opportunity for Senior Java Engineers to join a software consultancy and play an important role delivering a greenfield project for a large client in the iGaming industry. You'd join a product-based team within a large engineering department and would be responsible for owning all aspects of the systems you work on, from design through to deployment and supporting them in production. You must have prior experience in the iGaming, betting or FS industries. Skills: Java, Spring, REST APIs, AWS Microservices and Distributed Systems Kafka or RabbitMQ TDD and CI/CD Observability In return they're offering an initial 6-month outside IR35 contract paying up to £500pd. If youre interested and would like to know more, please apply through this advert and Ill be in touch.

Engineering Manager/Principle Engineer (Contract) - Pricing Transformation Programme Location: Bristol (3 days per week onsite) Duration: Initial 3-Month Contract - Strong scope for extension Rate: Up to £700 per day (Outside IR35) The Opportunity We're supporting a leading financial services organisation undertaking a major pricing transformation programme focused on modernising core products, platforms and engineering tooling. They are seeking an experienced Engineering Manager to provide technical leadership across a complex technology landscape, balancing the challenges of Legacy systems with the adoption of modern cloud-native technologies. This role will suit an engineering leader who is comfortable operating as a technology generalist, engaging with both technical teams and senior business stakeholders to shape engineering strategy, modernisation plans and delivery outcomes. Key Responsibilities Lead engineering activities across a significant pricing...

Senior Infrastructure Engineer - Central London £550 - £600 p/d (outside IR35) 3 month initial contract A leading engineering business is seeking a Senior Infrastructure Engineer to join their team. They are a well-established business about to enter a period of considerable operational change, including merger and acquisition activity, making it an exciting time to join and be part of their journey. Reporting into the Infrastructure Manager, you will oversee core infrastructure and networking. You'll work closely with managed service providers to ensure seamless operations and business continuity, whilst taking a lead on regular site set-ups and supporting infrastructure integration across newly acquired entities. Key Responsibilities: Lead and manage office and site networks, aligning with business strategy Act as an escalation point for the Service Desk Team Set up and configure Local Area Networks (LANs), including hardware deployment and support Coordinate with...

Senior DevOps Engineer 6-month contract Remote Working Outside IR35 Market Rates (c£500 to £525 per day) The Opportunity: Our client is supporting a major UK Government Agency on the delivery and operation of critical cloud-based digital services and is looking to appoint an experienced DevOps Engineer to join an established engineering team. This is an excellent opportunity to work within a modern AWS cloud environment, supporting the deployment, monitoring and continuous improvement of live services used across a high-profile government programme. The successful candidate will be a hands-on DevOps Engineer with strong AWS expertise, excellent troubleshooting skills and experience supporting production environments. You'll work closely with software engineers, architects and client stakeholders to ensure services remain secure, resilient and highly available. Skills and Experience: Essential Proven commercial experience as a DevOps Engineer, Cloud Engineer or...

Senior DevOps Engineer 6-month contract Remote Working Outside IR35 Market Rates (c£500 to £525 per day) The Opportunity: Our client is supporting a major UK Government Agency on the delivery and operation of critical cloud-based digital services and is looking to appoint an experienced DevOps Engineer to join an established engineering team. This is an excellent opportunity to work within a modern AWS cloud environment, supporting the deployment, monitoring and continuous improvement of live services used across a high-profile government programme. The successful candidate will be a hands-on DevOps Engineer with strong AWS expertise, excellent troubleshooting skills and experience supporting production environments. You'll work closely with software engineers, architects and client stakeholders to ensure services remain secure, resilient and highly available. Skills and Experience: Essential Proven commercial experience as a DevOps...

Job Title: SC Cleared Senior FPGA / Embedded Systems Engineer (Xilinx Zynq UltraScale+ & Yocto) Location: Hybrid/London/Bristol as and when required Rate: Up to £650 per day Outside IR35 Duration: 6 months with possible extension Must be willing and eligible to go through the SC Clearance process Our Client is hiring for a reputed client seeking a hands-on FPGA and embedded Linux expert to help design, integrate and verify high-performance hardware and software components. If you enjoy working at the boundary of silicon and systems-optimising throughput, latency and power-this could be a fantastic next step. What you'll be doing: Design, implement and verify custom FPGA IP modules, DSP pipelines and high-speed communications interfaces using VHDL or Verilog/SystemVerilog in AMD/Xilinx Vivado Lead SoC hardware/software co-design by configuring and integrating the Processing System (PS) and Programmable Logic (PL) on Zynq UltraScale+ devices, using AXI interfaces Build,...

Job Title: SC Cleared Field Solutions Engineer Location: Hybrid/London/Bristol as and when required Duration: 6 months with possible extension Rate: Up to £650 per day Outside IR35 Must be willing and eligible to go through the SC Clearance process Our Client is hiring for a reputed client looking for a confident Field Solutions Engineer to act as the technical bridge between clients and the team. If you enjoy hands-on technical work and turning complex security needs into clear demonstrations and guidance, this role could be a great fit. What you'll be doing: Provide technical liaison support to clients, helping shape secure infrastructure solutions Deliver product demos and build proof-of-concepts (POCs), including lab environments where needed Translate client requirements into technical approaches and clearly articulate security benefits Offer technical guidance and support during pre-sales and post-sales activity Communicate technical architectures effectively with...

Senior/Lead Software Engineer (Java) - o/s IR35 - Hybrid (2 dpw in office) A large retailer urgently seeks an experienced Senior Software Development Engineer to take a lead role in the design, development and support of scalable, cloud-native Java applications Working in an Agile, DevOps environment, you'll build microservices, APIs and event-driven solutions while collaborating with engineers, data scientists and operations teams to deliver high-quality software. The role is outside IR35 and requires 2 days per week in the office. Responsibilities include: Design and develop scalable Java applications and microservices Build and maintain cloud-native solutions using Azure Improve system performance, reliability and scalability Develop APIs and event-driven services with Kafka Mentor engineers and promote engineering best practices Support software throughout its full lifecycle in a CI/CD environment Essential Experience Experience of designing and...

🚨 Active DV Cleared Full Stack Engineers 🚨 I'm working with a leading UK defence client on a major AI programme and am looking to speak with experienced DV Cleared Full Stack Engineers for a long-term contract opportunity. The Role 12-month contract Outside IR35 £500–£600 per day London (4 days onsite) You'll be joining a multidisciplinary engineering team delivering secure, mission-critical software on one of the UK's most exciting defence programmes. We're keen to hear from engineers with experience in areas such as: Python Java React MongoDB AI / Machine Learning Kubernetes VMware AWS or Azure Essential: Active UK DV Clearance Happy to work onsite in London four days per week If you're looking for your next contract within the defence sector, I'd be happy to tell you more.

Product Engineer (Backend-Leaning) | Python, TypeScript, AWS | Billing, Pricing & Commercial Platforms | Energy / Trading | UK Remote | £500-550/day | 3-6 months | Outside IR35 The Company We're partnering with an ambitious technology business building software within a highly regulated, data-intensive industry, where billions of data points, complex business rules and commercial workflows need to be processed accurately and at scale. They're now looking for an experienced Product Engineer to help build the next generation of their commercial platform, with a particular focus on billing, pricing, settlements and high-volume transactional systems. This is an opportunity to join a small, high-calibre engineering team where you'll have genuine ownership, influence technical direction, and solve challenging engineering problems from first principles. The Role - Product Engineer (Backend-Leaning) | Python, TypeScript, AWS | Billing, Pricing &...

Product Engineer (Backend-Leaning) | Python, TypeScript, AWS | Billing, Pricing & Commercial Platforms | Energy / Trading | UK Remote | £500-550/day | 3-6 months | Outside IR35 The Company We're partnering with an ambitious technology business building software within a highly regulated, data-intensive industry, where billions of data points, complex business rules and commercial workflows need to be processed accurately and at scale. They're now looking for an experienced Product Engineer to help build the next generation of their commercial platform, with a particular focus on billing, pricing, settlements and high-volume transactional systems. This is an opportunity to join a small, high-calibre engineering team where you'll have genuine ownership, influence technical direction, and solve challenging engineering problems from first principles. The Role - Product Engineer (Backend-Leaning) | Python, TypeScript, AWS | Billing, Pricing &...