23 of 23 Part-Time Software Engineering Jobs in the City of London

Title: Software Engineer (Python Developer) Location: London, UK Employment Type: Contract Duration: Long Term Overview: We are seeking a skilled Software Engineer with strong programming expertise in Python and hands-on experience in data manipulation, analysis, and software engineering best practices . The ideal candidate will be passionate about clean, maintainable code and capable of building … cleaning, transformation, and analysis using Pandas and NumPy . Design and implement modular, reusable, and testable code following best practices. Collaborate with cross-functional teams to integrate data and software components. Utilize version control tools (Git) for code collaboration and management. (Optional) Build and enhance interactive dashboards using Plotly Dash for data visualization. Work with REST APIs to fetch … data cleaning, preprocessing, handling missing values , and performing complex data operations such as grouping, merging, pivoting, and aggregations . Working knowledge of SQL for data extraction and manipulation. 3. Software Engineering Best Practices Strong grasp of version control (Git) workflows. Experience writing unit tests (e.g., using pytest). Ability to write clean, well-documented, and modular code . More ❯

Platform Youll join a 50person, London/US SaaS scaleup serving toptier investment firms with a marketleading, data analytics platform for global credit investors (think Reuters and Bloomberg) The engineering org is Londonbased (circa 1314 people across DevOps, Frontend, AI/ML, Backend, and QA). Everything is the latest and greatest tech in the cloud, serverless etc. The … of rows of financial data. Youll drive architectural decisions, own services to production, and contribute to how massive datasets are modelled, partitioned, and served to customers. NonNegotiables: 810 years software engineering experience across multiple environments Node.js backend development SQL mastery with experience of working with largescale, dataheavy systems (our client has billions of rows) Architectural design experience and … Nice to Haves Financial services or largescale market data experience Python & C++ Development experience Database partitioning/rearchitecture exposure Mentoring/techlead experience (or appetite to step up) Modern software engineering/development practices, including micro-services, agile, TDD, etc. and common system integration patterns Knowledge of AWS services and IaC Why Join/Projects Rearchitect and scale More ❯

Head of Engineering - Java, AWS, MySQL, NoSql, REST APIs, Microservices, Artificial intelligence (Hybrid) Description for the Head of Engineering role:- You will be joining a fast-growing, small to medium sized Saas Company based in London. The Head of Engineering will be managing a very bright, talented team of engineers and working closely with the founder and … forward. This position will manage initially 10-15 engineers and will be working with the latest technologies including AI and ML. Core skills/Experience for the Head of Engineering role: 8yrs+ in Development roles 3yrs+ Managing Software Engineering teams Full Stack development experience including strong Java, Microservices and AWS Happy to still be hands on as … in AI/Machine Learning Likely to have experience in a Saas based company, ideally start up or early stage company going through growth. Salary for the Head of Engineering role will depend on experience, but expect between 100,000 and 125,000 + Pension + competitve benefits Head of Engineering - Java, AWS, MySQL, NoSql, REST APIs, Microservices More ❯

Head of Engineering London (Hybrid) up to 120,000 + Equity (ESOP) An opportunity to join one of the UKs most exciting Intelligent Automation companies, powering content for a huge number of brands globally, optimising how they distribute and monetise content, whilst using cutting-edge machine learning and predictive AI. The Role As Head of Engineering, youll lead … high-performing tea, bringing structure and technical direction to a fast-paced, product-led environment. Youll work closely with the CEO and Head of Product to shape the companies engineering culture, drive delivery and define the technical roadmap for an AI-driven platform trusted by global brands. This is a hands-on leadership role, ideal for someone who loves … Youll lead and contribute to: Architecture, system design and code reviews Scalable, AI-powered systems built in Java, TypeScript/JavaScript, SQL/NoSQL, AWS A collaborative, delivery-focused engineering culture Technical decisions that directly shape the future of media technology What Were Looking For 8+ years experience in software engineering, with 3+ years leading teams Strong More ❯

Mid-Level .NET Software Engineer | London | 60,00080,000 + Bonus + Hybrid Location: Central London (Hybrid: 2 days in office) Salary: 65,00080,000 + performance bonus + excellent benefits Tech: .NET 6/7, C#, AWS, Microservices, REST APIs, SQL, CI/CD The Opportunity Were partnering with a highly successful fast-growing SaaS brand based in … Central London who are looking for a talented Mid-Level .NET Software Engineer to join their expanding development team. This is an outstanding opportunity for an engineer with solid .NET experience and a passion for cloud technologies (especially AWS) to take the next step in a modern, forward-thinking environment. Youll be joining a company that invests heavily in … technology and talent, expect greenfield projects, cloud-first architecture, and genuine opportunities for growth. The Role As part of a cross-functional engineering team, youll: Develop and maintain high-quality backend systems using .NET 6/7 (C#) Design and build AWS-based microservices and scalable APIs Collaborate closely with product, DevOps, and front-end teams Contribute to architectural More ❯

Job Title: Software Developers Multiple Positions (Junior to Senior Principal) Location: London (Hybrid Flexible working with client site travel required) Salary: Competitive, based on experience (from 1 year to Principal level) Multiple positions available Clearance Requirement: Active SC or DV Clearance is essential About the Company Leading tech partner headquartered in London Rapidly growing with ambitious expansion plans Collaborative … and forward-thinking culture Focused on delivering software solutions that drive measurable business impact Role Overview Broad role spanning software development, architecture, and engineering Client-facing position with opportunities across diverse industries Design, build, and optimize scalable software applications and systems Work on high-impact, dynamic projects with flexibility to innovate Key Responsibilities Translate client requirements … into robust software solutions Develop and maintain applications using modern programming languages and frameworks Contribute to system architecture and design decisions Ensure code quality through testing, reviews, and best practices Collaborate with cross-functional teams to deliver project goals Stay current with emerging technologies and development methodologies Tech Stack & Tools Programming Languages: C++, C#, Python, JavaScript, TypeScript, Java Frameworks More ❯

native microservices and modern web apps? If that sounds like you keep reading About the Role Our client, a successful Public Affairs company are looking for a Mid-Level Software Engineer to join their talented engineering team to work on a mix of greenfield development and legacy systems. Youll get to make an impact from day one shaping … Refine search algorithms and explore LLM-based features You will play a key role in advancing their microservices-based, event-driven architecture. What youll bring: 3+ years of commercial software engineering experience with Python (FastAPI/Flask) and React. Experience with cloud platforms (GCP/AWS/Azure) and Elasticsearch. Familiarity with CI/CD and infrastructure-as More ❯

We're looking for a Senior/Principal Full-Stack Software Engineer to join our clients growing team. This is a high-impact role where you will shape our technical foundation, influence product direction, and help us scale. You'll work closely with cross-functional teams and leadership, including the CEO, to align long-term strategy, product vision, and More ❯

side development , including cloud services like AWS . Experience with Docker and Kubernetes Excellent communication skills Ability to gather requirements, liaise with stakeholders, and drive projects forward. A modern software engineering mindset Writing, testing, and deploying high-quality code efficiently. Why Join? Join a market leader This SME has 100+ employees and is at the forefront of its More ❯

Senior Senior Engineer Up to 90k We are partnered with a high-growth, VC-funded Data Intelligence platform. They are looking for passionate, dynamic engineers with start-up experience. Details: Full Stack Environment: TypeScript, Node.js, React (Redux/Context API More ❯

with front-end (React, Unity, WebGL, Android, iOS, React), back-end (Kotlin, REST, AWS, PHP8/Symfony4, AWS/Azure), AI, ML, web Past experience as a hands-on software engineer, ideally on Back End systems Ability to take concepts from vision to technical solutions working with business, technical, management, and subject matter experts to deliver products or platform More ❯

Software Engineer Location: London Experience: 57 Years Industry: Market Making/Proprietary Trading/Capital Markets **Please note applicants coming from a buy side/trading/capital markets background will be given a strong preference** Looking for software engineers to join a small but highly skilled, and collaborative, bringing together expert traders and software engineers. We … or Python (C++ a plus) Familiarity with databases (e.g., SQL Server, Postgres) Familiarity with developing, testing, or deploying with cloud providers (e.g., AWS, GCP, Azure) Experience using version control software (e.g., Git) Curiosity and a desire to solve challenging problems Strong programming ability A collaborative mindset and eagerness to give and receive feedback Excellent written and verbal communication skills More ❯

Principal Software Engineer Location: London - 1x a month Salary: 95,000 - 120,000 + equity + benefits An established, global technology business within the hospitality-tech industry is seeking an accomplished Principal Software Engineer to lead the design and delivery of next-generation digital solutions. This is an opportunity to shape greenfield projects from the ground up - architecting … and drive long-term innovation. What will I be doing? Lead the technical vision and architectural direction across complex backend systems, ensuring scalability, reliability, and performance. Partner closely with engineering leadership to define best practices, coding standards, and long-term technical strategy. Design, develop, and oversee the delivery of robust, production-grade software built using Python, Django, Cloud … with business priorities to deliver scalable, maintainable solutions. What do I need to be successful? Degree in Computer Science or equivalent hands-on experience. 7+ years' experience in backend software development, including several years in a senior or principal-level engineering role. Expertise in Python (or a similar backend language), with proven experience designing distributed systems, APIs, and More ❯

role for someone who thrives in a collaborative, product-driven environment and wants to shape the future of a platform used by global clients. What youll do as Senior Software Engineer: Lead the design and delivery of backend systems using C#, .NET, Azure, and CosmosDB Build robust APIs that power integrations across the platform Own system health and resilience … practices in DevOps, CI/CD, and security Collaborate with product, design, and customer teams to deliver impactful solutions Influence hiring and onboarding to help scale a high-performing engineering culture What experience youll bring: 5+ years building complex backend systems Deep expertise in C#, .NET, and cloud platforms (Azure preferred) Experience with microservices, serverless architecture, and secure API … Excellent communication and leadership skills If you want to build tech that matters and lead with impact in a company that values innovation, trust, and ownership then this Senior Software Engineer role is your chance to make a real difference. ** Unfortunately, due to the volume of applications, not all submissions will receive feedback More ❯

Staff Software Engineer Platform Own the strategy to support massive expansion Up to 170,000 plus benefits London Office 4 days a week Golang, AWS/GCP, Kubernetes, Distributed Systems Staff Software Engineer - Were working with a high-growth payments business that has disrupted the market to become a major player in Europe. With over 150,000 customers … and billions processed annually, they are scaling rapidly and now looking for an experienced Staff Software Engineer to join their Platform organisation. This is a senior technical leadership role, ideal for someone who enjoys working across multiple squads, setting technical strategy, and driving clarity in ambiguous problem spaces. The client is looking for an established Staff-level Software Engineer with both hands-on engineering expertise and the ability to influence at scale across an organisation. The Opportunity Shape the long-term technical direction of platform infrastructure. Lead cross-squad initiatives and empower teams to solve complex challenges. Drive innovation around cloud-native technologies and platform automation. Balance strategic vision with ~30% hands-on coding and design More ❯

Role : Software Engineer (React) Domain: Energy trading Day rate: 400-650 (Inside IR35) Location: London (hybrid 2/3 days per week) Contract: 6 months (Multi-year scope) X4 Technology are partnered with a global commodity trading firm in London offering an exciting inside IR35 contract opportunity for a Software Engineer (React). Working within a fast paced … energy trading business, youll build web applications using tools such as React, TypeScript, CSS, Jest/Vitest, Webpack, and AG Grid. Responsibilities of the Software Engineer (React) Plays an executional role in design and development projects. Advises internally on solving functional and technical issues related to web applications. Provides enterprise technology solution consultation and development. Manages complex integration scenarios … and interfaces between on-premise, cloud, and legacy systems. Requirements for the Software Engineer (React) 6+ years of experience in JavaScript, React, Redux, TypeScript, Styled Components, React Testing Library, REST APIs. Demonstrable experience in energy or commodity trading environments. Experience in modern JavaScript coding, testing, debugging and automation techniques. Cloud-based software exposure, particularly Azure DevOps, VSTS, and More ❯

Senior Software Engineer | AI-Powered Real Estate Startup Were partnering with a fast-growing AI startup thats transforming how investors make decisions in real estate. Their cloud-native SaaS platform combines street-level data, financial modelling, and machine learning to deliver smarter, data-driven investment insights . With a new funding round about to drop , theyre entering a bold … new growth phase - expanding products, scaling systems, and doubling down on innovation. As the Senior Software Engineer , youll play a pivotal role in shaping the platform and the team behind it. Youll define the technical roadmap, collaborate with product and data teams to ship impactful features, and stay hands-on when it counts - ensuring scalability, reliability, and world-class … engineering standards. What theyre looking for: Strong background in cloud infrastructure (AWS preferred) Solid experience with Python Proven track record of scaling teams and systems in fast-growth environments If youre ready to take the lead in a company redefining the intersection of AI and real estate , this is your chance to make a mark. Apply now - and help More ❯

Opportunity Summary Role | Graduate/Junior Software Engineer (Full-Stack) Experience | STEM degree (or equivalent) + personal projects/demonstrable passion for tech Company | Mission-Led Start-Up Stage | Scaling engineering team Location | London (Hybrid) Offer | 35,000 50,000 + benefits The Opportunity Kioni Talent is supporting a mission-led start-up in London as they expand … their engineering team. This is an exciting role for a passionate technologist who wants to work across the stack, learn from experienced engineers, and contribute to building meaningful software from day one. Youll be working with modern web technologies React, TypeScript, Next.js, Tailwind CSS with the backend hosted on AWS. This is a hands-on role where youll More ❯

Job Title: Senior Software Engineer Location: London (Hybrid/Remote options available) Salary: 80,000 per annum About the Role: We are seeking a talented and motivated Software Engineer with 5+ years of experience to join our dynamic team based in London. You will be instrumental in developing, deploying, and maintaining scalable web applications using modern technologies. Key … Responsibilities: Design, develop, and maintain web applications using Python and Django Build and manage cloud infrastructure on AWS Collaborate with cross-functional teams to deliver high-quality software solutions Write clean, maintainable, and efficient code following best practices Troubleshoot and resolve software defects and performance issues Requirements: 5+ years of proven experience in Python and Django development Strong More ❯

Are you interested in working in Tech for Good? Have you got experience working with Kotlin, or are keen to work with Kotlin? Principal Software Engineer Clean Energy for EV Charging Up to 150k + bonus + benefits Hybrid in London 2 days per week Weve just partnered with an industry leading GreenTech, on a mission to transition the … through providing affordable and accessible green energy for the charging of electric vehicles. Due to exciting projects in the pipeline, they are looking to grow their team with Principal Software Engineers who have experience in the following: Kotlin software development (They are also open to Core Java experience, as long as you are happy to work with Kotlin … days a week If youre interested in working with new technologies while also making a difference to the world, positively impacting through technology, apply now for this fantastic Principal Software Engineer opportunity! Please note : Due to compliancy reasons, we will only be able to consider applications based in and eligible to work the UK. More ❯

Attribution Search is partnering with a newly launched Hedge Fund for a Software Engineer as part of its further build. The fund is already a multi billion business with continued backing from a leading multi-manager platform. Now independently operated, the fund is scaling rapidly both in capital and complexity trading across new regions and a push into more … to join early, contribute meaningfully, grow with the fund, and play a significant part in the build of its trading technology. The Role: Youll join a lean, high-impact engineering team tasked with reimagining the trading and middle Office technology stack building smart, scalable systems to empower Portfolio Managers, Traders, and Operations teams. Key Areas of Focus : Next-Gen … plus Investment Banking, Asset Management or Hedge Fund experience Business knowledge on Trading and trade flows front to back Competitive comp package in line with top-tier hedge fund engineering roles More ❯

Role: Software Engineer - TypeScript Location: London - Hybrid Salary: 80-100k + equity I'm working with an innovative start-up that's building a new kind of product for a world of infinite software, a tool that helps people make sense of large, fast-moving websites. Think of it as a time machine for the web . … iterate. Tech Stack TypeScript across frontend, backend and infrastructure. Rust where performance matters - nice to have requirement SQL as the backbone for data. Modern tooling, monorepo, and a pragmatic engineering approach. Why Join Early impact: join a 3-person team at the earliest stage. High ownership: shape the product, stack and culture. Timing: this is a rare moment to More ❯

AI) Location: London (Hybrid 1 every other week) up to 600 a day (Inside IR35) The Role As a Data Engineer , youll join our cross-functional Product team of software engineers, ML specialists, domain experts, and product leads. Youll design, build, and deploy AI capabilities that empower intelligence analysts to make faster, sharper, and more confident decisions. This role … world problems, can balance technical depth with product impact, and wants to own their work from experimentation through to production. What were looking for 3+ years of hands-on engineering experience in production environments. Strong Python skills. Experience with Generative AI : LLMs and RAG. Adapting LLM for use as a Q&A System. Apply now and help define the More ❯