1 to 25 of 63 Part-Time Senior Software Engineer Jobs in the City of London

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 … 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 you will: Contribute to system architecture design and implementation Work on the integration of a recently acquired business into their current platform Work with cross functional teams to build an industry leading experience for consumers. Build integrations between the product and 3rd party APIs Coach More ❯

Senior Software Engineer | Leading ClimateTech ScaleUp | £105k + Equity Senior Software Engineer - Up to £105,000 per annum Leading Decarbonisation Scaleup - ~$100m funding from prominent VCs Up to £105,000 p/a + Meaningful Equity Central London - 1/2 days per week … by working with clients from small businesses to entire governments around the world with a plethora of unique solutions. We are looking for a Senior Software Engineer, proficient in Typescript, React and Node to join growing teams of cross functional engineers, working on everything from external facing … applications, internal development tools and AI/LLM models for environmentally conscious groups across the world. If you are a Senior Software Engineer looking to join a thriving and talented engineering team, working on solutions to help organisations of all sizes achieve net zero, this will be More ❯

Senior Software Engineer | TypeScript, NestJS, AWS | Data Intelligence Company My client is a fast-growing data and intelligence company working with major players in asset management. They’ve built a successful platform that’s already driving real results, now they’re investing heavily in tech to scale … It’s a chance to join a business with solid market traction, modern tech, and plenty of engineering challenges. They’re now hiring a Senior Software Engineer to develop and optimise their backend services. This is a hands-on role with scope to take ownership across the … full software lifecycle; from design and development to testing, deployment, and ongoing performance tuning. You’ll be working as part of a cross-functional team alongside product managers, designers, and engineers across the stack. The engineering culture is pragmatic, fast-paced, and collaborative. This role reports to the Lead More ❯

Senior Software Engineer (Python, JavaScript/TypeScript), London Hybrid, £100,000 + Equity + Benefits, Life Changing Industry The Opportunity: An opportunity to join a well-established business in the centre of London operating across the healthcare industry, as Senior Software Engineer. This position will … allow you to not only be a Engineer but one that is valued and needed to achieve the wider organisations long term goal. Your skills will be needed to build a range of products for consumers such as web applications and products that track health related issues. The software … direct impact on the consumer, and a positive influence on people’s lives. The Role: An opportunity to work for top health care organisations, Senior Engineer (Python, TypeScript, PostgreSQL). You will be working on a number of projects, helping to create innovative and life improving applications, products More ❯

Senior Software Engineer – Tech for Good – up to £120k (Plus Equity) - London This is not your average app build. Join a team of some of the brightest minds in the UK developing a Product to empower disabled people around the world. Backed by strong funding and aiming … for 100x growth, they’re building something as complex as autonomous vehicles but for a whole new domain. Role: Senior Software Engineer Salary: Up to £120,000 (Plus equity) Location: London/Hybrid Why join? - Backed by serious funding - Ambitious 100x growth plans - A product with real … world, global impact - A team of some of the UK’s brightest minds W e’re looking for: ✅ 4+ years experience in Software Engineering working on complex products, I.e Sensor fusion, AR, or computer vision. ✅ A solid software background with a willingness to learn ✅ Exp with TypeScript, React 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 … 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 More ❯

Role: Senior Software Engineer Location: Remote (with occasional monthly collaboration days) Are you... A software Engineer with 5+ years experience, working with modern programming with one or more programming languages such as Python, Golang, Java, Ruby, TypeScript etc? Experienced working on cloud platform such as … meet colleagues or even change if scenery when you like? About: Our client are a Scale-Up cloud solutions consultancy, helping customers to optimise Software & Cloud, covering DevOps, DevSecOps, Transformation, Strategy and more. Due to recent successes in the continued commercial strategy, we are now looking to grow the … engineering footprint significantly to build new teams for new customer engagements. As a Senior Software Engineer, you will have the opportunity to work across various industries and sectors. This diversity ensures that no two projects are the same, allowing you to gain valuable insights into the unique 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 … 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 More ❯

Senior Software Engineer – AI – London One of my AI Clients are looking for an Senior Software Engineer to join a team that's reimagining how software is built by integrating cutting-edge AI tools directly into the engineering lifecycle. Responsibilities: Design intelligent multi … agent systems tailored for software development Develop prompt structures, logic flows, and tool integrations that guide agent behaviour Enable agent access to development infrastructure, including file systems, test suites, version control, and APIs Evaluate AI performance and continuously refine workflows Orchestrating systems of AI agents to elevate how teams … write and deliver software at scale Key Skills: 5+ years software engineering experience Proficiency with modern backend and frontend technologies such as Java, TypeScript, React, and MySQL Hands-on experience with generative AI tools and platforms (LLM APIs, agentic frameworks, codegen systems, vector databases) Driving innovation as a More ❯

have ambitious growth plans and are searching for the best and brightest minds from across tech and finance to help us achieve our aim. Senior Software Engineer We are seeking a highly experienced and results-oriented Senior Software Engineer to join our growing team. … improvement and driving innovation. Problem Solving: Tackle complex technical challenges and develop creative solutions. Shipping Products: Demonstrate a proven track record of successfully shipping software products to production. Requirements Extensive Software Engineering Experience: A minimum of 5+ years of professional software engineering experience, with a demonstrable track … record of delivering high-quality software products. Strong Python Skills: Excellent proficiency in Python programming. Focus on Code Quality: A deep understanding of software engineering principles and a passion for writing clean, well-tested, and maintainable code. Product Delivery Experience: Demonstrated experience of successfully taking software projects More ❯

Senior Software Engineer | Asset Management | A leading asset management firm is seeking a Senior Software Engineer to join its dynamic technology team. This is an exciting opportunity for an experienced developer to work on cutting-edge financial applications, leveraging C#, .NET, ASP.NET, JavaScript to … fast-paced financial environment. Required Skills & Experience: Proven experience in C#, .NET, and ASP.Net development. Strong frontend expertise in JavaScript. A deep understanding of software architecture, design patterns, and development best practices . Experience working in financial services or asset management is highly desirable. Ability to work within an … high-impact technology projects. Competitive salary, bonus structure, and excellent benefits. Be part of an innovative, forward-thinking team that values technological excellence. Experienced software engineers passionate about financial technology and looking to make an impact in the asset management space are encouraged to apply. More ❯

Senior Software Engineer – Java Backend London (5 days onsite, with some ad-hoc flexibility) £85,000 – £120,000 (Permanent) TechHeads is currently seeking a Senior Software Engineer with strong Java backend experience, DevOps awareness, and proven technical leadership capabilities to join our Client’s … in the US, Ireland and India, to ensure alignment and execution. Build and deploy secure, resilient APIs (REST/GraphQL) and optimise the full software development lifecycle through automation. Requirements: 7–10+ years of professional experience in software engineering, with a strong focus on Java backend development . … GCP/Azure). Bonus: Exposure to tools like Elasticsearch/Kibana , Hadoop/HBase , OpenSearch , or VPN/proxy architectures. Strong grasp of software security principles , system performance optimisation, and infrastructure reliability. Experience working on large-scale , production-grade systems with distributed architectures. Ideal Candidate will: Bring technical More ❯

Title : Senior Software Engineer Company : HPC R&D Location : London (very flexible hybrid) Pay : Up to £180,000 + bonus and benefits Company : An advanced HPC R&D firm, looking to expand their Driver team. Most of the team are ex-Big-Tech, ex-FAANG or ex … technical leadership. If you want to work alongside some of the brightest, most enthusiastic people in the industry, this may be worth exploring. Role : Senior Software Engineer position. You will be a significant hire spearheading much of their 2025 development. Much of the team will be built … stack, focusing on the performance and efficiency of graphics and compute workloads on cutting-edge GPU architectures. About you: 6 years+ as a driver engineer Strong C++ or C programming skills Experience with OpenCL or Vulkan (other graphics APIs are also fine) Strong knowledge of GPU development Full details More ❯

Title : Senior Software Engineer Company : HPC R&D Location : London (once per month) Pay : Up to £200,000 + bonus + benefits Company : An advanced HPC R&D firm, looking to expand the UK compiler team. Most of the team are ex-Big-Tech, ex-FAANG or … technical leadership. If you want to work alongside some of the brightest, most enthusiastic people in the industry, this may be worth exploring. Role : Senior Software Engineer position with an emphasis on AI Compiler development. You will be working with Triton, but any experience with any compilers … edge compiler development project. Significant hires have already been made in the team to support this role. About you: 6 years+ as a compiler engineer Strong C++ programming skills Experience with Triton, LLVM, MLIR or other compilers Experience with GPU architectures Full details are available. Please don't hesitate More ❯

to excel in a dynamic, high-energy environment. Join our team and help shape the future of AI. Location and Legalities This full-time Senior Software Engineer position is based onsite in our brand-new Ultralytics office in London, UK, with a hybrid model of 3 days … remote. Applicants must have legal authorization to work in the UK, as Ultralytics does not provide visa sponsorship. What You'll Do As a Senior Software Engineer at Ultralytics, you will be a key player in designing, developing, and scaling the Ultralytics HUB , our end-to-end … Ultralytics' mission of delivering top-tier machine learning tools and models to the community. ️ Skills and Experience 5+ years of experience in full-stack software engineering. Expertise in and experience with web frameworks like or Django. Proficiency in modern frontend development using and frameworks such as , Vue.js, or React. More ❯

and Albatross to the team. From TravelCare, to FlexiPerk and of course GreenPerk we are shaping the future of the industry. Are you a Senior Software Engineer with extensive programming experience? We’re not looking for stack experts. We’re looking for smart people who can bring … architect and implement our product. TravelPerk is a next-generation platform to take the pain out of booking and managing business travel. As a Senior Software Engineer, this position involves: Product development in Python/Django and/or React of a travel-related web-based product 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 … 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 More ❯

Join a deep-tech start-up transforming embedded software tooling – London, Hybrid Working Model This stealth-mode start-up is tackling one of the most persistent pain points in modern electronics... integrating complex semiconductor chips into real-world systems. Backed by leading UK investors, the team is developing an … AI-powered platform that radically simplifies embedded software development and reverse engineering. They’re now looking for a Senior Embedded Software Engineer to help build intelligent tooling for reverse engineering, low-level firmware analysis, and code generation. You’ll work at the cutting edge of embedded … systems, combining traditional driver development with modern AI and analysis frameworks. For this Senior Embedded Software Engineer , we’re looking for someone with: Extensive experience in embedded development (baremetal/RTOS) Proficiency in C/C++ for low-level software and firmware Hands-on experience with 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 … 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 … 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 More ❯

Senior Engineer (Functional programming)– up to 150k - 30 days holiday + bank holidays + Stocks options The opportunity: An opportunity to join one of the UKs fastest growing startups. With a London office, but open to candidates across the UK with occasional office visits, they are operating across … AI and Data processing. This position will allow you to not only be an Engineer, but one that is valued and needed to achieve the wider organisations long term goal. Your skills will be needed to build a range of products for consumers such as web applications and products … that track automation. The software that you build will have a direct impact on the consumer, and a positive influence on people’s lives. The Role: An opportunity to work for a leading AI organisations, Senior Engineer (Functional background). You will be working on a number More ❯

Role: Senior Backend Software Engineer (Satellite Communications) Location: London Salary: £90-120k Copello is currently partnering with a global laser communications company. With technology acquired from Google, they are redefining how data moves across land, sea, air, space, and beyond. As a Backend Software Engineer … powerful network orchestration platform designed for highly dynamic, global-scale connectivity systems. Your expertise in C++ or Golang will help shape a next-generation software stack that enables seamless communication across satellites, aircraft, and other high-mobility platforms. What You’ll Do Design and develop highly scalable backend systems … to support real-time, distributed networking Build and optimize software for cloud, on-prem, and hybrid deployments Work with Kubernetes, Docker, and cloud technologies (AWS, GCP, or Azure) Implement and optimize algorithms for network routing, resource allocation, and system orchestration Collaborate with cross-functional teams of engineers, researchers, and More ❯

Company | Fintech, B2C Size | 70 people Role | Backend Engineer Level | Senior Areas | backend focus, product development, infrastructure ✨ Tech | Python (Flask), PostgreSQL, Docker, AWS, Terraform Based | London (Zone 1) Working | hybrid (1-2 days a week in-office) Offer | £100-120k Hi Workonomics are partnering with a fintech … strong product - market - fit , experienced year - on - year growth , and are now in scale - up mode. They're looking to hire a ( backend - leaning ) Senior Software Engineer to: own all backend and infrastructure services across the company make 10x efficiency improvements across the core platform build out … . js ) frontend, on a mix of Heroku and AWS . They also use PostgreSQL . ✅ This will suit a product-minded, backend-focused engineer who likes working closely with non-technical stakeholders, and taking business ideas in to production ✅ If this sounds like you, please hit apply for More ❯

We're partnered on an exclusive basis with a rapidly growing start-up who are looking for a Senior Software Engineer/Lead Engineer to help expedite their growth and be a future leader of the business. With an already experienced team they are looking for More ❯

Software Engineer | C# .NET, Kafka, Azure | Real-Time Integration – FinTech Bank - 'DevOpsy Developer Role' 6+ Month Contract £600-650 per day Outside IR35 Hybrid – Central London (2 days per week onsite) An opportunity to join a well-renowned (est. 40yrs) Financial Services institution who have been moving into … layer for a new digital-first bank. You’ll be at the core of building microservices to relay data between D365, Temenos, fraud screening software, internal ERP systems, and a host of Banking-as-a-Service platforms. All built in .NET and running containerised over Azure on OpenShift and … Docker/Kubernetes and the broader container ecosystem Experience building or contributing to developer platforms or self-serve CI/CD pipelines A collaborative engineer who thrives in agile teams and enjoys solving platform-level challenges APPLY ASAP for success! Software Engineer | C# .NET, Kafka, Azure | Real More ❯

TypeScript/JavaScript - Software Engineer Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, React, NextJS, TypeScript, Cloud Tech, Terraform, AWS. 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 … 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 TypeScript Software Engineer with NodeJS, JavaScript, TypeScript and NodeJS and including cloud technologies … 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 More ❯