1 to 25 of 30 Permanent Python Software Engineer Jobs in the City of London

Founding Software Engineer | Python | Early-Stage AI Start-Up | London Founding Software Engineer (Python) required to build, scale, and own the technical foundation of a well backed, early-stage AI start-up from day one. This is a rare opportunity for a strong Python Software Engineer to join at the ground floor, working directly with the founders to define the architecture, ship core systems, and shape the long-term technical vision of the company. You’ll have genuine ownership, influence key technical decisions, and play a central role in taking ...

Senior Software Engineer (Python) Hybrid London (1–3 days per week) Up to £80,000 + Benefits Are you a passionate Python engineer who thrives on building scalable, high-quality software? We’re working with a multi-award-winning digital agency , recognised … Sunday Times Best Places to Work , that’s looking for a Senior Software Engineer (Python) to help shape the next generation of their data-driven tools and products. 💡 Why this role? Work at the intersection of data, automation, and AI , delivering tools that drive measurable impact ...

Principal Software Engineer - Python - Fully Remote Experienced Python Engineer needed for an early-stage Start-Up that is already profitable and looking to expand the founding team. You will be looking to work for a Start-Up and be trusted to take responsibility … development. Looking for a world class Python Engineer , with experience with Typescript and ideally DevOps to play a crucial role. About you: 5+ years of professional Software Engineering Experience with proficiency in Python Professional experience with TypeScript Product focussed - worked closely with product during the development ...

Python Software Engineer - VC-Backed Start-Up - London We're looking for a Python Software Engineer to join a fast-growing start-up developing a standout product in a high-potential, niche market. Backed by one of the world’s most prestigious venture capital … building a world-class team. This is a rare opportunity to play a key role at a pivotal stage of growth, where your Python skills will have direct and visible impact . What We’re Looking For 5+ years of professional experience with Python Strong academic background ...

Python Software Engineer – High-Frequency Trading We're working with a high-frequency trading (HFT) firm that is looking to expand its technology team with a Python Software Engineer. This is an opportunity to join a trading firm operating at the cutting edge of global … global exchanges. You’ll work on some of the most complex and rewarding engineering challenges in the financial technology space. The Role As a Python Software Engineer, you’ll collaborate with traders, quantitative researchers, and other developers to design, develop, and optimise trading infrastructure. ...

Principal (Director) Software Engineer - Python, Typescript, React, AWS - Elite funded Fintech **this role will come with a competitive salary, benefits and equity as my client is looking to 10x in the next 5 years** A leading fintech scale-up is hiring a Principal (Director) Software Engineer … capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Principal (Director) Software Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data ...

Software Engineer - Python, React We are working with a leading FinTech who are looking for a Full Stack Engineer to join on a contract basis. You’ll work across Python services and modern front-end applications built with React and TypeScript. The role involves building … paying £500-£600 per day. This is a hybrid role, 1 day a week in Central London. Please apply now for more information! Software Engineer - Python, React ...

Senior Software Engineer | Computer Vision | C++ | Python | 3D | OpenGL | Hybrid, London Senior Software Engineer — 3D Asset Processing & Rendering We’re looking for a senior software engineer to own the 3D asset processing and rendering infrastructure in our desktop material-capture application for Windows. … pipelines, OpenGL rendering libraries, integration with third-party 3D tools, backend database connectivity, and Windows releases. This role is ideal for a C++ and Python expert passionate about 3D graphics, real-time rendering, and VFX/game workflows, and who wants to help build a next-generation system connecting ...

Senior Software Engineer (Python) - GenAI Start-Up - London - £300,000 + equity Durlston Partners is working with an elite-level AI Tech firm that is looking for a Senior Software Engineer (Python) to join their team. You’ll work with AI researchers, data scientists … write production code, design distributed architectures, and solve complex engineering challenges in large-scale, data-intensive environments. What You’ll Do Build and optimise Python systems for AI research, model training, and data pipelines. Turn research models into efficient, production-ready solutions. Maintain distributed, high-performance services for training ...

this is wrong and we are on a mission to fix it, triggering the future of hardware design. We are creating an entirely new software engine for circuit boards, that takes as inputs the requirements of a circuit board and automatically outputs a complete design, ready for manufacture. … Lead Software Engineer, you’ll create simple and elegant solutions to difficult technical problems that the world has not solved before. You will work in close collaboration with a highly-functioning team of software, electronics, algorithm engineers and product managers. Responsibilities Collaborate with the product team ...

Senior Software Engineer (Python/AWS) £90 - £100k 📍 Location: London or Manchester 💼 Employment Type: Full-time, Permanent About the Role We’re looking for a Senior Software Engineer with deep experience in Python and AWS to help design, build, and scale distributed, data-driven … ensuring the systems you build are secure, observable, and resilient. Key Responsibilities Lead complex delivery: Drive the end-to-end design and implementation of Python-based microservices and cloud-native solutions hosted on AWS. Architect and optimise systems: Define service boundaries, data ownership, and failure-recovery patterns for scalable ...

Principal Software Engineer | Python | Commodities Trading | London Our client is a global investment manager with a strong footprint across major financial centres. They manage multi-asset, commodities, and derivatives strategies for institutional and wholesale clients worldwide. The environment combines the scale and stability of an established asset … data-driven technology Close collaboration between trading, quant research, risk and technology teams The firm is now looking for a strong, passionate and experienced Python Engineer to join the Front Office Technology team. They are re-architecting the stack to be cloud-native on AWS , with Python ...

Senior Software Engineer, Python, TypeScript, React - Elite funded Fintech **this role will come with a competitive salary , benefits and equity** A Series C funded fintech scale-up who has just raised over £350million and now valued at over £700million is hiring a number of Senior/Lead … Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to an organisation that has tripled revenues over the past 2 years and is being classed as one of the next Unicorns. The company operates at the intersection of technology ...

Founding Software Engineer | React Native, React, Python/Node.js | AI Start-Up | London Hybrid 3x/Week | Up to £120k + Equity We have just partnered with one of the most exciting early stage start-ups in the AI creativity space who need an engineer … Antler or Entrepreneur First) and that is what they are looking for in their next hire without looking at years of experience. This Founding Software Engineer role is for someone who has full stack experience mainly working on Frontend (React/React Native) and Backend (Node/Python ...

Software Engineer – AI Startup – Up to 85k 🚀🧠 💰 Salary: £50,000 - £85,000 + meaningful equity 🏙️ Location : London, flexible working arrangements, ideally 1/2 days in office 💻 Tech Stack : Python, Flask, FastAPI, React, TypeScript, GCP (Backend Leaning) Our y-combinator backend client are building an elite engineering … world problems with the latest in AI and LLMs, this role is for you. In this role, you’ll: 🔧 Build and ship high-impact software 🧠 Work on AI/LLM-powered automation tools used in production 🏗️ Help shape scalable systems and infrastructure 🌍 Work collectively across teams to push ...

Senior Software Engineer – AI Startup – Up to 120k 🚀🧠 💰 Salary: £70,000 - £140,000 + meaningful equity 🏙️ Location : London, flexible working arrangements, ideally 2/3 days in office 💻 Tech Stack : Python, Flask, FastAPI, React, TypeScript, GCP (Backend Leaning) Our y-combinator backend client are building an elite … world problems with the latest in AI and LLMs, this role is for you. In this role, you’ll: 🔧 Build and ship high-impact software 🧠 Work on AI/LLM-powered automation tools used in production 🏗️ Help shape scalable systems and infrastructure 🌍 Work collectively across teams to push ...

Senior Front Office Software Engineer – Python - Commodities Trading Orbis are partnering with a global Energy Trading firm on the build out of a new greenfield trading desk. As part of this exciting new development, they’re looking for the first Senior Front Office Python Developer … provide enhanced analytics and tooling for Traders and Front Office teams To be a successful applicant, you will need: Exceptional programming capability in Python (including pandas) with a deep understanding of Object Oriented Programming and Computer Science fundamentals Previous experience working in a top-tier engineering environment - big tech ...

Role: Python Software Engineer - Up to £100k + Stock Options Offered! Salary: Up to £100k + Stock Options Offered! Location: United Kingdom Skills: Python, Fast API This firm is an elite AI tech company with high tech standards who have previously set tech world records. They … limits. They’ll find the best team to suit your skillset/interests but you can expect to working with the latest technologies (Python, Fast API etc) to pioneer cutting edge AI solutions! What else is in it for you? • Software Engineers are treated as the company ...

Exciting Contract Opportunity for an experienced Python Data Engineer/Software Engineer to join a Leading Energy Company and help build scalable, cloud-native data solutions. This will be a long term project with scope for extensions and possible transition to permanent staff. Core Skills Needed … Strong Python development PySpark and SQL expertise Solid understanding of Azure infrastructure Knowledge of Containers, Microservices, and functional design patterns Experience working in Agile environments Terraform for IaC Unit testing best practices (PyTest preferred) HTML/CSS React TypeScript FastAPI framework Competitive PAYE Rates Available. With a focus within ...

Technical Quantitative Developer/Software Engineer with deep Computer Science expertise applied to Python, its libraries and ecosystem as well as professional experience with SDLC tooling, Linux, Docker, and SQL sought to join a specialist London Headquartered Quantitative Hedge Fund. You will join as a more junior … Backtesting Frameworks, to be used by diverse Investment teams as part of their daily work. The target architecture will be written in pure Python, with SQL RDBMS, a Dockerised On-Prem RedHat Linux platform. Python is the primarily required skill, however solid professional profiency of building and shipping ...

Senior C++ Software Developer, Python - Financial/Banking Candidates will have 5+ years C++ experience (ideally more) and excellent knowledge of Python - ideally coming from a Financial/Banking background with knowledge of Equities, Futures & Options and Fixed Income and Exchange Connectivity, FIX Protocol and some … work with the Product, Infrastructure and QA teams, to produce high performance, low latency and highly reliable code. Your goal will be to develop software which handle large amount of TPS to drive a highly efficient technology used by several markets around the world. To be successful in this ...

working with a rapidly growing Series A startup backed by top-tier VCs who are seeking highly skilled Software Engineer with deep expertise in backend development. This company is revolutionising how software is built and deployed and is at the forefront of AI-powered automation - they … creating innovative solutions that fundamentally change the development process. As a Senior Engineer, you'll be at the intersection of traditional engineering excellence and cutting-edge AI-assisted development. You'll build production-ready systems, working with automation-generated code and evolving it into robust, scalable solutions. This organisation ...

Software Developer (Python/Django) 📍 Hybrid – Onsite 2 Days/Week (UK) 🔐 Must Have: Live & Active Security Clearance From Day One 📅 Start: January 💷 Outside IR35 | Public Sector We’re partnering with a public sector organisation to find a talented Software Developer to join their team from January … ideal for someone who enjoys enhancing established systems, collaborating within a supportive engineering environment, and delivering steady, thoughtful improvements to a widely used platform. Software Developer – What You’ll Be Working On Enhancing and maintaining a server-side application built with Python/Django Performing database work including ...

Role: Software Engineer - Conversational AI (Python) Location: London - Hybrid Compensation: £150,000 - £300,00 We’re working with a AI company delivering AI voice agents to major brands. We need engineers who can move quickly, own production systems, and partner with customers to deliver measurable improvements. … requirements 2+ years industry experience; Python required. Experience with backend systems, async code, and debugging production issues. Comfortable working directly with customers and cross-functional teams. Nice-to-have: experience integrating ML models, voice-stack exposure. ...

Startup - Backend Python Engineer A pair of second time founders who have already built and exited successful ventures are assembling a new elite engineering team for their next AI startup! They have secured top tier backing (8 figures!), built early traction with thousands of users … backend systems that could redefine how people interact with AI every day! 💡 The Role Build core backend services, APIs and distributed systems in Python Design architecture, data flows and infrastructure foundations from day zero Work directly with the founders on product strategy and technical direction Move fast ...