25 senior software engineer jobs found in London

Senior Software Engineer - Node & React Remote with very occasional client visits £420 - £440pd Outside IR35 3-month contract Our client, an established and successful Consultancy are looking for an experienced Developer to join them on a contract basis. With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders This is a completely hands-on role where you will develop and maintain scalable, full-stack web applications using Next.js and Node.js We are looking for: Demonstrable and proven experience in full-stack applications (inc. working knowledge of a range of technologies such as React, Node.js and TypeScript). Experience with Azure and ARM templates including dev and deployment of supporting cloud infrastructure (inc. pipelines). Excellent, in-depth understanding of BDD, TDD and SOLID principles. In-depth...

Senior Software Engineer - Node & React Remote with very occasional client visits £420 - £440pd Outside IR35 3-month contract Our client, an established and successful Consultancy are looking for an experienced Developer to join them on a contract basis click apply for full job details

CONTRACT SENIOR SOFTWARE ENGINEER - eDV CLEARED NEW CONTRACT JOB OPPORTUNITY AVAILABLE WITHIN A LEADING NATIONAL SECURITY COMPANY FOR A SENIOR SOFTWARE ENGINEER WITH eDV CLEARANCE Contract job opportunity for a Senior Software Engineer Globally leading defence / cyber security company £500 - £750 per day (inside and outside IR35 roles available) London based organisation in an easily accessible location Contract Senior Software Engineer To apply please call or email WHO WE ARE? We are recruiting multiple contract Senior Software Engineers to work with various clients in London ranging from R &D companies, Multi-National Consultancies to SME 's and product based companies. Due to the nature of the work these clients do, you must hold enhanced DV Security Clearance. WHAT WILL THE SENIOR SOFTWARE ENGINEER BE DOING? As a Senior Software Engineer, you will work with an experienced agile team to design and deliver...

Senior Software Engineer | Python | Outside IR35 | Remote We are supporting a high-profile public sector programme delivering an AI-enabled product from proof of concept through to user testing. This is a hands-on Senior Software Engineer role where you will take significant ownership of delivery, working as part of a multidisciplinary team to build, iterate and operationalise an AI use-case MVP. The Role As a Senior Software Engineer, you will play a key role in delivering a greenfield AI solution from early-stage prototype into a robust, testable product. Working closely with engineers, data scientists and a User-Centred Designer, you will help shape the architecture, build a new user interface, and ensure the solution is production-ready within a secure cloud-native environment. This is a senior, hands-on engineering role suited to someone comfortable taking ownership of significant components or services across the full lifecycle - from design and build through to...

We 're partnering with a fast-growing sports/entertainment business to hire a Senior Backend Engineer with hands-on experience in HubSpot and complex backend systems. This is a 6-month contract, outside IR35, with potential for extension or permanent conversion. The Role You 'll take full ownership of the Commercial Data Manager (CDM) platform and the HubSpot ecosystem, bringing previously external-managed systems fully in-house. This role combines backend development, integrations, and stakeholder collaboration, giving you real technical leadership and system ownership from day one. Key Responsibilities: Lead the CDM platform (70%) and HubSpot system (30%) Take over HubSpot maintenance, expansion, and integrations Collaborate closely with commercial stakeholders to implement new fields/features Mentor engineers and shape team practices Drive architecture and integration decisions across multiple services Team...

Senior Software Engineer | Python | Outside IR35 | Remote Cloud, Data & AI Platforms We are supporting a consultancy with a substantial UK portfolio as it accelerates its digital, data and AI capability. As part of a wider transformation programme, we're looking for a Senior Software Engineer to help design and deliver scalable cloud-native platforms, with increasing adoption of AI and machine learning to drive smarter decision-making. This is a senior, hands-on role within a multidisciplinary engineering environment, blending modern software delivery, cloud platform engineering and emerging AI/ML integration. The Role As a Senior Software Engineer, you will contribute to the design and build of robust digital and data services, while enabling the integration of AI/ML capabilities into core platforms. You'll work closely with data engineers, data scientists and product teams to ensure models and analytics solutions are production-ready, scalable and secure....

Senior C# Developer - Commodities Trading - Outside IR35 Exciting opportunity for an experienced senior developer to build on their experience in Commodities or similar trading development role in this successful Commodities Trading company. £750 - 800 per day Outside IR35 The Senior C# Developer will have significant prior experience as a Senior Software Engineer/Senior Developer working as C# Developer in a Commodities trading environment where they will have gained knowledge of the full trade life cycle and feel comfortable speaking directly to traders and senior stakeholders in the business as well as senior technical colleagues such as architects. Central London location, with Hybrid working expected. Very strong core skills in C# are expected Good knowledge of Commodities Trading is also required. Please apply now if your curious to learn more, for a confidential discussion about the role and company Guidant, Carbon60, Lorien & SRG - The Impellam Group...

DV Cleared Senior Software Engineer Aldermaston - Onsite 12-month contract Outside IR35 Are you a DV cleared Software Engineer who can take full ownership of software delivery on site? Do you enjoy building Siemens PLC solutions from scratch in secure, regulated environments? Looking for a long-term contract with a strong on-site engineering focus? What's in it for you £650 to £750 per day Outside IR35 1 click apply for full job details

Senior GraphQL Engineer (Federation) - TypeScript | Node.js | Kubernetes - Contract (Outside IR35) Location: West London (Hybrid - 2 days/week on-site) Contract: 6 months initial (extensions highly likely) Start: ASAP Eligibility: UK-based candidates only Rate: Market rates (Outside IR35) We're hiring a Senior GraphQL Engineer (GraphQL Federation) to design, build and scale high-performance GraphQL APIs in a modern TypeScript/Node.js stack, deployed to Kubernetes in a cloud-native environment. This is an ideal contract for a GraphQL specialist who loves clean schemas, resilient services, and production-grade delivery. The Role (Key Responsibilities) Own end-to-end GraphQL API delivery : schema design through to production integration, focusing on performance, maintainability, security, and scalability . GraphQL Federation expertise : design and implement supergraphs, subgraphs, resolvers , and governance patterns (versioning,...

Senior C# Software Engineer (Contract) Location: London (Hybrid) Rate: £500 per day IR35 Status: Outside IR35 Duration: 6 Months (Initial) The Opportunity Join a high-performing engineering team within a London-based powerhouse that is currently dominating its sector. This company has moved past the startup phase into a period of sophisticated, sustainable growth, and they are now maturing their global platform to be truly cloud-agnostic. This role is perfect for a Senior Engineer who thrives on architectural variety. You won’t just be maintaining a single environment; you will be building high-throughput systems that leverage the best features across AWS, Azure, and GCP . The Role As a Senior C# Engineer, you will lead the development of mission-critical services that form the backbone of a rapidly scaling infrastructure. Your focus will be: Backend Development: Writing clean, testable, and high-performance code using the latest...

C# | .NET | Azure | Docker | Kubernetes | Microservices | Hybrid | £750pd | Outside IR35 One of our leading clients in the Energy Trading space is looking for a software engineer to join there team building new features across their trading suite. They are looking for a Senior .NET Engineer who is strong working in backend systems, as well as being comfortable building and maintaining pipelines using CI/CD, Docker and Kubernetes. The reason for the additional headcount is due to the client heavily investing in new emerging commodities markets, you will be joining a squad of senior engineers, so for this role you do not need to have previous energy trading experience. However if you do this would be advantageous. Contract Details: 6 months rolling contract Outside IR35 Hybrid - 3 days a week onsite in London Up to £750 per day Tech Stack: C# .NET Azure / AWS (the client is cloud agnostic) Docker / Kubernetes / AKS CI/CD Microservices If...

Senior Data Engineer | Azure | Snowflake | Fivetran | DBT | ETL / ELT | APIs Rate: £225 per day (Outside IR35) Contract: Initially 9 months - likely to extend Start: ASAP Working model: Remote depending on location or Hybrid 1 day p/w Working hours: UK (GMT) Required: Azure, Fivetran, Snowflake, Python & APIs (Non Negotiable) ℹ️ Only candidates with relevant Fivetran experience will be considered for this role. 🚨 Non‑Negotiables - Please only apply if you have ALL of the following 🚨 Core technologies: Snowflake (data warehouse) Fivetran (data connectors) DBT (data transformation) Python (including building custom API connectors) Environment: Strong experience working in Azure‑based data environments Proven, hands‑on experience as a Data Engineer Strong experience building and maintaining ETL/ELT pipelines Solid understanding of data warehousing and data modelling concepts Key skills: Experience...

Job Description About us At Technip Energies, we believe in a better tomorrow and we believe we can make tomorrow better. With approximately 15,000 talented women and men, we are a global and leading engineering and technology company, with a clear vision to accelerate the energy transition. Designing and delivering added value energy solutions is what we do. Genesis Energies is a global business unit of Technip Energies, providing impartial, high-value advisory services for the energy industry. We have an unrivalled track record of bringing high-impact solutions to clients. As trusted advisors committed to a sustainable future, we have extensive experience working in true partnership with our clients while providing innovative, robust and sustainable solutions. This is what differentiates Genesis in today’s market. From Engineers and Specialists to Project Managers and Support Staff, spread across 15 countries, our people thrive in a dynamic, proactive business that’s...

Day rate: £700 - £800 p/d (OUTSIDE IR35) Location: London (Hybrid - 1 day/week in the office, rest flexible) Start Date: ASAP 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 architecture...

We are seeking a Security Architect/Senior Security Engineer to support the design and implementation of security controls for the rollout of Cloud Adoption Framework (CAF) compliance activities within an AWS-based software delivery programme. The role will work closely with senior architects, engineers, and security stakeholders to help ensure solutions align with GDS Service Manual principles , supporting secure and resilient delivery across Privileged Access Workstations (PAWs) , SOC integration , and device security . This is a hands-on role suited to someone with solid cloud security experience who is looking to step further into architecture and assurance responsibilities within a UK public-sector environment. Key Responsibilities Security Architecture & Design Contribute to the definition and maintenance of security architecture for PAWs and AWS workloads in line with CAF and GDS standards. Support the development of secure patterns for application and...

We 're partnering with a fast-growing sports/entertainment business looking to hire a Senior Backend Engineer on a 6-month contract (outside IR35), with potential to convert to permanent ( £95k). This is a hands-on tech lead role with ownership of core platform systems powering multiple websites and internal services. The Role You 'll take full technical ownership of the NextGen CMS and Master Data (MDM) systems, designing, developing, and mentoring a small team of engineers. This role is perfect for someone who thrives in complex, high-scale environments and wants real impact from day one. Key Responsibilities: Lead development across CMS and MDM systems Maintain and expand complex backend systems (not standard CMS) Mentor engineers and set engineering standards/patterns Drive architecture, integrations, and system scalability Work closely with stakeholders to deliver features and improvements Team Environment:...

We 're partnering with a fast-growing sports/entertainment business looking to hire a Senior Backend Engineer on a 6-month contract (outside IR35), with potential to convert to permanent ( £95k). This is a hands-on tech lead role with ownership of core platform systems powering multiple websites and internal services. The Role You 'll take full technical ownership of the NextGen CMS and Master Data (MDM) systems, designing, developing, and mentoring a small team of engineers. This role is perfect for someone who thrives in complex, high-scale environments and wants real impact from day one. Key Responsibilities: Lead development across CMS and MDM systems Maintain and expand complex backend systems (not standard CMS) Mentor engineers and set engineering standards/patterns Drive architecture, integrations, and system scalability Work closely with stakeholders to deliver features and improvements Team Environment:...

🚀 Senior Front-End Engineer – Investment Banking | £700-800 (Outside IR35) London / Hybrid (1 Day/Week in Office) 📅 Details Day rate: £700 - £800 p/d (OUTSIDE IR35) Location : London (Hybrid – 1 day/week in the office , rest flexible) Start Date : ASAP 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...

Cloud/AWS Infrastructure Engineer Location: London, UK Employment Type: TP (Outside IR35) Duration: 6-12 Months Job Responsibilities: · Maintain and improve AWS cloud infrastructure for 24/7 bank operations, focusing on stability, performance, security, and compliance · Enhance connectivity between AWS accounts, client, and third parties to ensure secure and reliable customer experiences · Design and create automation scripts and tooling using Bash, Python, or Go · Build and support cloud platforms for application developers, improving SDLC and developer experience · Manage vendor relationships and coordinate project efforts across business areas · Participate in on-call rotation to support platform reliability Required Qualifications, Capabilities, and Skills: · Formal training or certification on software engineering concepts and advanced applied experience · Hands-on experience with AWS and infrastructure as code (Terraform) · Understanding of...

Software Engineer - Node & React Remote with very occasional client visits £400 - £420pd Outside IR35 3-month contract, potential for extension Our client, an established and successful Consultancy are looking for a number of experienced Developers to join them on a contract basis With head offices in the north of the UK and branches spreading across the globe, they're a dynamic technology consultancy leader with a dedicated team of professionals, partnering with sector leaders This is a completely hands-on role where you will develop and maintain scalable, full-stack web applications using Next.js and Node.js We are looking for: Demonstrable and proven experience in full-stack applications (inc. working knowledge of a range of technologies such as React, Node.js and TypeScript). Experience with Azure and ARM templates including dev and deployment of supporting cloud infrastructure (inc. pipelines). Excellent, in-depth understanding of BDD, TDD and SOLID...