9 senior backend developer jobs found

PLEASE NOTE: SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ) preference may be given to candidates who meet all of the essential criteria and hold active security clearance.   As a Senior Developer you will play a key role in delivering robust and maintainable software that meets user needs. You will contribute across the full software development lifecycle, from design and implementation through to deployment and production support. You will build a deep understanding of the wider service and use that knowledge to solve technical problems, improve system reliability, and help shape practical solutions. Alongside your development work, you will contribute to a strong engineering culture by reviewing code, sharing expertise, and supporting...

PLEASE NOTE: SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ) preference may be given to candidates who meet all of the essential criteria and hold active security clearance.   As a Senior Developer you will play a key role in delivering robust and maintainable software that meets user needs. You will contribute across the full software development lifecycle, from design and implementation through to deployment and production support. You will build a deep understanding of the wider service and use that knowledge to solve technical problems, improve system reliability, and help shape practical solutions. Alongside your development work, you will contribute to a strong engineering culture by reviewing code, sharing expertise, and supporting...

PLEASE NOTE: SC Clearance is an essential requirement for this role, as a minimum you must be willing & eligible to undergo checks. Please note, due to the exceptional requirements of this position (short-term nature of this role and speed at which we require a postholder in situ) preference may be given to candidates who meet all of the essential criteria and hold active security clearance.   As a Senior Developer you will play a key role in delivering robust and maintainable software that meets user needs. You will contribute across the full software development lifecycle, from design and implementation through to deployment and production support. You will build a deep understanding of the wider service and use that knowledge to solve technical problems, improve system reliability, and help shape practical solutions. Alongside your development work, you will contribute to a strong engineering culture by reviewing code, sharing expertise, and supporting...

Job Title: Software Developer Team Lead Location: London (3 days onsite) Duration: 12 Month Contract Start Date: ASAP IR35: Inside Clearance: Active DV Security Clearance required   Deloitte Working with the Deloitte Associate (Contractor) Programme means we can offer you the opportunity to work on a variation of industry and client related projects. Our aim is to retain the best talent and so when your project end date nears our team of Talent Community Advisors will be working with you to look at alternative projects within the firm that suit your experience should you wish to continue with Deloitte.   Role We are seeking an experienced Senior Developer to provide technical leadership for the delivery of an AI-enabled Defence tasking and workflow platform. The role will help shape a secure application that combines Python/FastAPI services, React and TypeScript user interfaces, Camunda workflow...

Fully remote, outside IR35 contract role until 31/05/2027 - up to £750 per day Reapit - Who are we? Reapit is the original end-to-end business technology provider for estate agencies of all sizes. We've been helping sales and lettings agents build relationships and grow their businesses for more than 25 years. Our technology empowers property professionals across Europe, the Middle East, Australia, and New Zealand to work with buyers, sellers, tenants, and landlords to deliver a dream home experience. Worldwide, over 100,000 agents across more than 15,000 branches use Reapit to run their businesses, manage properties, collect rent, engage clients, and provide outstanding customer service every time. What you'll be doing Reporting to the Director of Engineering, you'll operate as a highly senior, technically hands-on Back End engineer, Embedded into a squad and owning delivery of substantive, cloud-native services end-to-end. Ad-hoc client...

Job Title: Software Developer Team Lead Location: London (3 days onsite) Duration: 12 Month Contract Start Date: ASAP IR35: Inside Clearance: Active DV Security Clearance required   Deloitte Working with the Deloitte Associate (Contractor) Programme means we can offer you the opportunity to work on a variation of industry and client related projects. Our aim is to retain the best talent and so when your project end date nears our team of Talent Community Advisors will be working with you to look at alternative projects within the firm that suit your experience should you wish to continue with Deloitte.   Role We are seeking an experienced Senior Developer to provide technical leadership for the delivery of an AI-enabled Defence tasking and workflow platform. The role will help shape a secure application that combines Python/FastAPI services, React and TypeScript user interfaces, Camunda workflow...

Role description Senior AI Infrastructure Engineer (Agent Runtime Platforms) London – Hybrid ASAP 6 month Contract Inside IR35/ Fixed Term Employment   UST is looking for a Senior AI Infrastructure Engineer with deep experience building and operating production-scale agentic AI systems. You'll work with leading agent runtime platforms such as Amazon AgentCore Runtime (or similar) to deploy, secure, and scale AI agents and multi-agent workflows across enterprise environments.   What You'll Do: Deploy and manage AI agents and multi-agent systems in production Configure agent runtimes, tool integrations, permissions, and access controls Design memory, state management, and context-handling architectures Implement AI guardrails, governance, monitoring, and observability Build Python-based APIs, platform services, and orchestration layers Develop scalable, cloud-native AI solutions on AWS Contribute reusable...

Delivery Lead - Websites (Contract) Who we’re looking for An experienced Senior Delivery Lead or Project Manager with experience delivering complex, business-critical change programmes. You'll be an exceptional stakeholder manager, comfortable influencing senior leaders and leading cross-functional teams to achieve successful outcomes. Experience of content-focused initiatives and content platforms, coupled with a strong delivery mindset and the ability to operate effectively in complex environments, will be key to success in this role. This is an initial 6 month contract with the potential for extension.   About Us Schroders is a global investment manager which provides active asset management, wealth management and investment solutions. We aim to provide excellent investment performance to clients through active management. We serve a diverse client base that includes pension schemes, insurance companies, sovereign wealth funds, endowments,...

Full Stack Developer (React + Python/FastAPI) Healthcare Software Glasgow, Scotland (hybrid, 2 days a week in the office) | £350 375/day | 6-month contract, Outside IR35 | Start 20/10/2026 MindClon builds healthcare and medicolegal software that handles sensitive personal data under UK GDPR and clinical governance obligations. We're moving our clinical-records product off Firebase onto a new platform: a React Front End, a Python/FastAPI API and background worker, PostgreSQL, and self-hosted language and speech models. The same containers run on Google Cloud and in on-premise installations with no Internet access. You'll build this platform with a small engineering team and the Chief Technical Officer. This is a mid-level role. You'll own features from requirement to production, with design review and support around you. What you'll do Build features end to end: React and TypeScript in the browser, and FastAPI endpoints with Pydantic validation, business...