26 to 50 of 105 Senior Software Engineer Jobs in the City of London

Senior Software Engineer – Python/Golang – Hedge Fund. A leading hedge fund is developing a new orchestration platform and are looking for a senior software engineer to play a key role on the build of an enterprise workflow orchestration platform. You will work with a large existing codebase which is written in Golang, to … Golang experience, who is an expert in another language, i.e. Python, Java, C# etc., who can work autonomously and make a fast impact in a dynamic environment. 10+ years software engineering experience in enterprise environments 1+ years golang experience and understanding of its unique applications Strong background in multiple other major programming languages Financial markets experience is preferred but More ❯

Job Title: Senior Software Engineer Location: London About the role: My client are looking for a senior software engineer with a strong background in infrastructure, DevOps, and security best practices, along with advanced Python development skills. In this role, you’ll play a pivotal part in designing and leading infrastructure focused projects, helping them … goals Improve observability, incident response, and system reliability Help shape our cloud strategy, ideally with experience in AWS account and resource management Requirements: 5+ years of experience as a software engineer with a focus on infrastructure or DevOps Advanced skills in Python and experience writing production grade code and tools Proven experience leading infrastructure or platform engineering projects More ❯

Senior Software Engineer (Clinical Software) We are partnering with an exciting growth business who are making huge strides in their field of within HealthTech. Due to that growth and the ever changing progression of their software they are looking for an experienced Software Engineer to support the business on their journey and play … team to tackle practical challenges. Work across a modern stack including Go, Java, TypeScript/React, and MySQL. Key skills and experience: At least 5 years of hands-on software development, from design through testing and maintenance. Proficiency in at least one mainstream language (Go, Java, TypeScript). Experience with cloud platforms (AWS, GCP, Azure). Strong analytical thinking More ❯

Senior Backend Engineer – Python | AWS 💵 £80,000–100,000 + share options 📦 Private medical + GP service | 25+ days holiday | Paid sabbaticals | Flexible working 💻 Python, AWS 📍 Central London, hybrid (1 day per week) 🧑‍💻 Profitable FinTech We're partnered with a profitable, VC-backed fintech scale-up that’s helping thousands of small businesses across Europe thrive. They combine … modern approached to software engineering with a strong sense of purpose and employee wellbeing. They're one of the UK’s standout tech employers in the fintech space. This role offers full ownership, from project scoping to release, with the autonomy to shape backend architecture of projects with real business impact. You'll have the opportunity to take the … data-driven environment. Most of the codebase is in Python, however they've utilised the likes of Rust and Go in smaller pieces of work. Ideal Profile: Strong backend software engineering experience with relevance to their stack (e.g., Python, Go, Rust or any OO language etc.). Confident working with relational databases. Experience with designing relational database schemas (PostgreSQL More ❯

Senior Full Stack Engineer | Hybrid | £90,000 + 15% bonus | React.js | Python | TypeScript | AWS Are you passionate about renewable energy and seeking an opportunity to make a positive impact on the environment? La Fosse has partnered with a rapidly growing renewable energy company, seeking highly motivated Senior Full Stack Engineers to join their close-knit product team … you Enhanced parental leave policies 3 quick stages! An initial chat, a technical chat, and a final interview. If you're interested, please apply below with your latest CV! Senior Full Stack Engineer | Hybrid | £90,000 + 15% bonus | React.js | Python | TypeScript | AWS More ❯

Senior Full Stack Developer Salary up to £90,000 Office Location - Close to Tower Bridge, London 2 x per week in the office Join our exceptional team as a Lead Full Stack Engineer and become a valued member of our expanding team. Together, we are at the forefront of driving innovation and progress in our cutting-edge digital … platform. This platform powers a diverse range of applications. Responsibilities: Embrace a hands-on coding role, diving deep into software development. Create highly scalable software solutions to enhance functionality and durability. Collaborate closely with the wider team to refine requirements, ensuring feasibility and pragmatism, and validate development tasks in Jira. Transform designs into highly performant code. Manage design More ❯

driven tech company. You’ll lead a small, agile team building scalable backend systems with Node.js , TypeScript , and AWS —delivering real impact, fast. This role is ideal for a senior engineer who loves hands-on coding, technical leadership, and solving tough problems in a fast-moving environment. What You’ll Do: Lead end-to-end delivery of features More ❯

Structures, High Frequency Trading, Tailwind, CSS, React Query, API, High performance UI Harrington Starr has partnered with an innovative Digital Currency Investment Platform Company that specialise in developing unique software systems for clients for invest into Digital Markets from Pensions, Investments and Fund Management. This is an exciting opportunity to join a small team within a large organisation and … ecosystem. This organisation are developing cutting edge web-systems, which are being used globally and are offering the opportunity for you to play a pivotal role within the full software development life cycle. We are looking for an experienced Trading Systems UI Developer with NodeJS, JavaScript, TypeScript and NodeJS and including cloud technologies. You will have a degree in … in Computer Science - Required A leader within their community and a specialist Development team already in place, due to recent success they are looking to further build out their Software Engineering team in their London Office. You will be working on cutting edge platforms for Trading and analytics for Digital Investments. If you feel you are ready to take More ❯

Full stack Angular/.Net Developer - Insurance 6 month initial contract 650 Inside IR35 Hybrid: x 1 per week on site, Central London We are currently recruiting for 3 full-stack Angular/.Net Developers to join the Risk technology More ❯

About the projects: We are building LLM evaluation and training datasets to train LLM to work on realistic software engineering problems. One of our approaches, in this project, is to build verifiable SWE tasks based on public repository histories in a synthetic approach with human-in-the-loop; while expanding the dataset coverage to different types of tasks in … terms of programming language, difficulty level, and etc. About the Role: We are looking for experienced software engineers (tech lead level) who are familiar with high-quality public GitHub repositories and can contribute to this project. You should have experience working with well-maintained, widely-used repos with 500+ stars. This role involves hands-on software engineering work … accelerating the advancement and deployment of powerful AI systems. You’ll be at the forefront of evaluating how LLMs interact with real code, influencing the future of AI-assisted software development. This is a unique opportunity to blend practical software engineering with AI research. What does day-to-day look like: Analyze and triage GitHub issues across trending More ❯

team by six more engineers. You’ll be working with a modern stack including Java 21, Spring Boot, Microservices, AWS, PostgreSQL, TDD, BDD, and React. They’re hiring Mid, Senior, and Lead Engineers who are strong problem-solvers, great communicators, and excited to build in a high-growth, mission-driven environment. A fintech/Payments or Finance background is More ❯

into the CTO Required Skills: Excellent communication and collaboration skills Proven experience delivering complex projects with C#.NET, SQL, and Mongo (or similar) TDD/BDD approach Strong knowledge of software and system design patterns More than 8 years industry experience Desirable Skills: Specific experience working on large-scale booking systems Team leadership experience/stakeholder management Cloud-native development More ❯

X20 Senior Software Engineers Needed – Tech Start Up – Fully Remote - GO, Golang, PHP, GraphQL, GRPC, AWS, API, Microservices, Next.JS, React - Offices based in London but all roles are fully remote 🌳🌳🌳 Areti has partnered with a rapidly growing tech-led organization who are seeking multiple Software Engineers ranging from junior to senior and looking to grow their … team by a further 20 Software Engineers this year. They are one of the most exciting START-UPS in the UK! As a Software Engineer, you will enjoy working on a variety of interesting and challenging projects and can work with various programming languages. On the other hand, if you are happy working in your niche and … the software languages you are most comfortable with then this is fine also. Culture, Fun, and self-development are words often heard in this organization so if you are a software engineer looking for a company with clear career and development opportunities then please reach out today. You will ideally have exposure to as many of these More ❯

X20 Senior Software Engineers Needed – Tech Start Up – Fully Remote - GO, Golang, PHP, GraphQL, GRPC, AWS, API, Microservices, Next.JS, React - Offices based in London but all roles are fully remote Areti has partnered with a rapidly growing tech-led organization who are seeking multiple Software Engineers ranging from junior to senior and looking to grow their … team by a further 20 Software Engineers this year. They are one of the most exciting START-UPS in the UK! As a Software Engineer, you will enjoy working on a variety of interesting and challenging projects and can work with various programming languages. On the other hand, if you are happy working in your niche and … the software languages you are most comfortable with then this is fine also. Culture, Fun, and self-development are words often heard in this organization so if you are a software engineer looking for a company with clear career and development opportunities then please reach out today. You will ideally have exposure to as many of these More ❯

Senior Software Engineer (Python) Central London – (hybrid model) £85-105,000 per annum + equity package, 4 weeks work from anywhere etc. Python, React, Typescript, Docker, Kubernetes, AWS Switch Tech Talent are currently partnered with a leader in the SaaS space, hiring for a number of Senior Engineers for their market leading platform who after a … acquisition are now expanding into new markets. Currently valued at over €1bn after a recent Series-E raise at $200m. With exciting plans for growth across the globe this Senior Engineer position offers the opportunity to work on a product with a huge amount of growth and complex challenges ahead. As the Senior Software Engineer … platform Work with cross functional teams to build an industry leading experience for consumers. Build integrations between the product and 3rd party APIs Coach and mentor wider team members Senior Software Engineer requirements: A passion for building consumer centric products 5+ years experience building technically complex solutions (ideally with Python) You’ll have extensive cloud experience (ideally More ❯

Working for an industry leading, high-growth SaaS business with some of the biggest brand names in the world as customers, the Senior Software Engineer will build innovative next-gen solutions that are at the forefront of the industry. In this role, the Senior Software Engineer will be given full autonomy, taking ownership from … backend systems (some frontend too, if you like). This area is the future of the company (and the industry!) and as such has strong investment and visibility. The Senior Software Engineer will be responsible for leading the design, build and deployment of industry leading software solutions. You’ll work in collaboration with product, design and … the wider engineering team to improve and scale existing features, as well as build brand new ones. The Senior Software Engineer will have: • Strong backend or full-stack software development experience • Strong coding experience in either Java, Golang (Go), Python or Scala – multiple would be even better! • Experience with cloud platforms e.g. AWS, Azure, GCP - Google More ❯

Senior Software Engineer, Contract – B2B FinTech SaaS | Go & AWS | London (Hybrid) Company: Cloud Lending Solutions for Modern Finance A fast-scaling SaaS FinTech, streamlining SME lending for banks and alternative lenders. Looking for a Senior Software Engineer on a contract basis to support a major platform upgrade and help scale our event-driven architecture. More ❯

Senior Software Engineer | Distributed Systems | Sustainable Cloud Native Platform 💸Up to £110,000 per annum plus bonus plus stock 🏠Central London office 🖱️Golang, Rust, C, Kubernetes, Linux, Cloud Native, Distributed systems... Are you a Senior Software Engineer with extensive knowledge of building distributed systems? Looking to join a company who are solving genuine problems … a real impact on projects? If so... I'm partnered with a very exciting Cloud scale-up who have received record Series A funding and are looking for innovative Senior Software Engineers to join their ambitious team! With a new VP of Engineering who has spent much of their career building out a world leading Cloud platform, the … to build out state-of-the-art, Greenfield code which can focus on being the worlds most accountable and sustainable cloud provider🌳 What they're looking for in a Senior Software Engineer: Tech agnostic but preferable experience working with Golang, Rust, C/C++ or Java. In-depth knowledge of distributed systems, building solutions at scale where More ❯

Senior Software Engineer Key Technologies: C#, .NET, React, AWS, Docker, Kubernetes City of London, United Kingdom Perm Role: £80,000 - £120,000 Harrington Starr has partnered with a Global Financial Services Vendor and they are looking for a Senior C#, .NET Software Engineer to join their growing team! This role provides the perfect opportunity … communication skills. Unrestricted right to work in the UK. This role offers hybrid working, with an office location based in the City of London. This role will suit a Senior Software Engineer, with expert C#, .NET experience and commercial use of React having a direct impact from the get-go. Apply below and if you have any More ❯

Senior LNG C#/.Net required for a 6-month initial contract. Rate Negotiable Hybrid - 3 days in the London office My client is open to candidates who have strong EOS or Endur experience Must have strong knowledge of LNG Experience Required: - LNG ETRM engineering C#/.Net SQL Azure devops Nice to have: - React More ❯

Senior Software Engineer (Music Tech/AI) - TypeScript, NestJS, NextJS, GCP 📍Location: West London, 3 days a week on site 💸Salary: £90,000-110,000 + Equity 📈 Incubated: A startup within a global music business ⚙️Required Skills: TypeScript, NextJS, Nextjs, GCP, ReactJS Join a startup redefining music’s and technologies role within health and wellbeing.. We're … physical wellbeing. They're exploring novel uses for biometric feedback and AI to positively impact the lives of many within non-surgical and mental recovery. We're looking for Senior level Software Engineers with the motivation to join a Founding team and help build the future of wellbeing music tech. You’ll ideally be comfortable working across the … systems, create POC's and work closely with their external clients. They're pragmatic, effective communicators and would like to bring someone in who has experience within startup environments. Senior Software Engineer (Music Tech/AI) - TypeScript, NestJS, NextJS, GCP More ❯

Company | Cybersecurity, B2B SaaS 📏 Size | 80 people total (10 in London and growing) 🧢 Role | Software Engineer 🪜 Level | Senior 🎯 Areas | cloud infrastructure, platform engineering, IAC ✨ Skills | Go, Node.js, Python, AWS, GCP, K8s, Terraform 📍 Based | London (Zone 1) 💻 Hybrid | 2-3 days a week in-office 💰 Offer | £100-120k base + equity Hi Workonomics are partnering with a … the $1 million ARR milestone while still in stealth mode . They recently raised £20m Series A and are now growing their team in London. They're seeking a Senior Software Engineer to help tackle cloud infrastructure scalability challenges . Ultimately, they're figuring out how to maintain a multi - region , multi - cloud environment in a fast … cloud platforms ( AWS/GCP ) in multi-region deployments Kubernetes , Terraform , CloudFormation and similar tools working in a high - growth scale - up SaaS company ✅ This will suit a platform engineer who can design, build, and implement stuff from scratch ❌ This will not suit an engineer with a pure IT/Ops/Sys Admin/Infrastructure background If More ❯

Senior Software Engineer – Biotech | £70–80k | Hybrid (3 days/week in London) We’re supporting a fast-growing biotech company in London that’s using cutting-edge automation and machine learning to accelerate therapeutic antibody discovery. They’re scaling their internal systems and tools and are now hiring two Senior Software Engineers to join … This is a full-stack role (though one of the hires could lean more towards backend). You’ll work closely with scientists, engineers, and product stakeholders to build software that powers real-world lab automation and scientific data handling. What you'll be doing: Building tools that enable large-scale scientific experiments and research automation Collaborating with wet … lab scientists and non-technical users Developing clean, maintainable software in Python, React, TypeScript Deploying and managing apps in GCP Working in a close-knit engineering team with room to shape architecture and best practices What they’re looking for: 5+ years of Python development experience (industry) Solid experience with production systems and CI/CD pipelines Experience with More ❯

UI Engineer - £70-120k (+ Bonus offering of up to 100%) Energy Hedge Fund Start up environment London - Hybrid We're seeking a talented UI Engineer to join our Energy hedge fund client. As a Front End Engineer in a small team you'll play a pivotal role in designing, developing, and optimising robust software More ❯

Senior DevOps Engineer – Data Protection Hybrid in London Office Up to 120k + bonus + benefits We are thrilled to partner with an innovative cybersecurity company that is revolutionising data protection for the GenAI era. This innovative scale-up equips security teams with advanced tools to safeguard sensitive data effortlessly, eliminating the need for tedious labelling and complex … rules. Their pre-trained data protection models foster secure innovation through intuitive user interactions and gentle nudges. They are seeking Senior DevOps/AWS Engineers to collaborate with top industry professionals and tackle complex challenges, as they expand their platform with a multi-region AWS deployment, including the creation of a dedicated US AWS environment. 💻 Tech stack: AWS, Kubernetes … Terraform 📍 Hybrid (2 days a week in the London office – very flexible) 💰 Up to £120k + bonus + benefits A great Senior DevOps Engineer will have: 5+ years of commercial experience in AWS Degree in Computer Science or a related field Adaptability to working in an early-stage scale-up Experience of managing multi-region platforms on AWS More ❯