1 to 25 of 79 Permanent Senior Software Engineer Jobs in London

Senior Software Engineer (Python) – Reducing Carbon Emissions with Machine Learning! Python on AWS £90-£110,000 per annum plus stock London Office - 1-2 days a week Are you a Senior Software Engineer with a passion for working with curious, humble colleagues to build … exceptional customer-focused products using Python? Do you align with their principles – “Work as much as you want, where you want” - giving Software Engineers the autonomy and support to perform at their best? Do you want to be part of a period of significant growth and opportunity, shaping elegant ...

Senior Software Engineer Central London | Hybrid £100k–£140k + bonus + equity Python, Databricks, AWS/GCP, Kubernetes We’re hiring a Senior Software Engineer to join a well-funded data business operating in the government/intelligence space. This Senior Software Engineer role sits within the Core Engineering team, working on a high-scale data platform analysing complex transaction data. It’s a technically challenging environment with real-world impact. As a Senior Software Engineer, you’ll optimise ETL/ELT pipelines (batch & streaming), improve architecture ...

Senior Software Engineer C++ (Python, SQL, Linux, Trading, FinTech, Financial Technology, Low Latency, Backend) ***This is a hybrid role, 3 days remote and 2 days in the office*** Our client actively encourages diversity, equality and inclusion within its workforce and welcomes applications from a diverse background … Solutions Limited does not discriminate in regards to age, gender, national origin, religion or any other basis. An excellent opportunity has arisen for a Senior Software Engineer C++to join a friendly team my client are a well-established exchange (FinTech, Financial Technology) based in the City. ...

Senior Software Engineer Location: London - Hybrid Salary: £70,000-85,000 Tech stack: Typescript & Node.js Maxwell Bond have partnered with a leading SaaS business who are looking for a Senior Software Engineer, with a focus on frontend development, to join their team. … work on one of the largest complex platforms for an enterprise client, being hands-on throughout the full software development lifecycle. What you'll do as Senior Software Engineer: Design, build and maintain full stack development for an enterprise platform, taking ownership from initial design through ...

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 … 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 ...

Senior Software Engineer - AI SaaS Platform London (Hybrid - 2 days onsite) £90,000 - £110,000 + bonus + benefits A high-growth B2B generative AI scale-up based in central London is looking for a Senior Software Engineer to help build the next generation … engineers collaborate closely with product managers and designers to ship high-impact features and continuously improve the platform. This role would suit an experienced engineer who enjoys building scalable systems, working across the full stack, and contributing to a product used by real customers. Key Responsibilities Design and deliver ...

Senior Software Engineer Key Technologies: C#, .NET, React, JavaScript, Typescript, AWS, Docker 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 … 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 having a direct impact from the get-go. ...

Senior Software Engineer/Front End Developer (TypeScript React) London/WFH to £120k Are you a technologist with start-up experience looking for your next opportunity? You could be progressing your career at a tech start-up that is producing an AI native data pipelining platform. … Salary to £120k Equity Impactful role with excellent career progression as the company scales Hybrid working Pension Your role: As a Senior Software Engineer within a small team, you will build and implement new features across the full tech stack, with a focus on building ...

Role: Senior Software Engineer (with DevOps) 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, Python and/or Golang, Java, Ruby, TypeScript etc? Experienced working on cloud … 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 ...

Senior Full Stack Software Engineer | Node.js • TypeScript • React • AWS | Scaling SaaS Start-Up 🚀 💰 Package: Up to £100,000 📍 Location: Old Street, London (hybrid) 🛠 Tech Stack: TypeScript, Node.js, React, AWS The Opportunity: We’ve partnered with a high-growth SaaS Start-Up that’s transforming how businesses leverage … data to scale. After securing significant investment and being led by a seasoned founding team, they are looking for a Senior Full Stack Software Engineer to help drive their technical roadmap and product innovation. This isn't just another coding job; you’ll be tackling complex engineering ...

Senior Software Engineer The Opportunity On behalf of a global powerhouse in FinTech Infrastructure , we are seeking a Senior Software Engineer . Our client operates one of the largest financial networks, serving as the digital backbone for thousands of global financial institutions. This … senior-tier appointment for an engineer who excels at building resilient, high-concurrency systems and wants to lead the digitalization of global financial markets. The Technical Stack You will be working within a modern, engineering-first culture. The core stack includes: The Engine: Expert-level C# and .NET ...

Senior Software Engineer - SaaS/AI scale up £80-£90,000+ benefits and remote working A Senior Software/Principal Software Engineer opportunity for an exciting tech business offering innovative products to a global customer base. This is a senior hands … engineer position in a Ruby, Rails, React, AWS stack leading projects in a scale up environment. The business is developing a genuinely exciting product and are growing; they promote autonomy and collaboration and support remote working. Previous experience in a full stack engineer role using Ruby, TypeScript, React ...

Senior Software Engineer | £900 per day (Inside IR35) | London | 3 days in Office Industry: Commodities Trading Location: London Job Type: Contract (6 months initial) Our client, a leading commodities trading firm, is seeking a Senior Software Engineer to support Front Office Technology across … Power. This is a senior, delivery-focused role suited to an engineer who can take ownership of initiatives and drive them end-to-end within a fast-paced trading environment. You will work closely with Front Office stakeholders and technology teams, delivering robust platforms and tooling that directly ...

Senior Software Engineer | Python | AI Systems | London | £120k to £160k + Equity Location: London hybrid Salary: £120k to £160k + meaningful equity Building AI systems is easy. Building AI systems that behave predictably in production is not. We are working with a well funded Series A startup … real challenge is the engineering around AI. Evaluation, control, reliability and designing systems that behave consistently in production. The engineering team is small, senior and deeply technical. Engineers work directly with users, own problems end to end and help shape both the technical architecture and product direction. ...

Senior Software Engineer Salary: £75k-£110k (plus attractive bonus on top) Location: London or Leeds (relaxed about hybrid or remote working, if preferred) My client is a specialist provider of sports pricing and trading technology, developing advanced simulation-based models and risk tools that underpin the performance … major sports brands. Role Overview Were looking for a Senior Software Engineer to join the Modelling & Data Engineering group at a rapidly expanding sports-technology business. This is a hands-on role in a fast-moving environment where youll help shape new modelling tools, improve existing systems ...

Senior Software Engineer (Tech Agnostic- Python, Go, Rust) Hybrid- London £100,000-£135,000 + Generous Equity + Strong Package Series A | High-Growth Tech We're partnered with one of Europe's fastest-scaling technology startups, fresh off a major Series A raise and building … More than half in Engineering, Product and Data Culture built around experimentation, high standards and rapid feedback loops You'll work closely with senior engineering leadership who have previously scaled large distributed systems and ML-driven platforms at global technology companies. Tech Environment Backend systems currently built in Python ...

Title : Senior Software Engineer (Compilers) Company : HPC & AI Location : London (primarily remote) Compensation : Up to £190,000 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 ex-Chip firms. They joined … 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 a significant hire and will own much ...

Title : Senior Software Engineer (GPU Drivers) Company : AI Acceleration Location : London (very flexible WFH) Pay : Up to £160,000 + bonus and benefits Company : An advanced HPC R&D firm, looking to expand their GPU Driver team. Most of the team are ex-Big-Tech, ex-FAANG … 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 ...

Senior Front Office Software Engineer – Real‐Time Trading Systems Contract – Inside IR35 £700 - £1100 per day London – Hybrid (3 days in office) The Short Version. You must be a senior software engineer with experience in trading environments. You need to be a well-rounded … engineer in Python, C#/.NET or other object-oriented languages. With an ability to deliver real-time cloud based solutions at the speed a trading desk needs. Want to know more? Click to apply or read the full JD below. Full Job Description: You’ll be joining ...

Senior Software Engineer Key Technologies: C#, .NET, React, JavaScript, Typescript, AWS, Docker City of London, United Kingdom Perm Role: £80,000 - £120,000 Harrington Starr has partnered with a Global Commodities Brokerage and they are looking for a Senior C#, .NET Software Engineer ...

Senior Software Engineer – AI Startup – Up to 140k 🚀🧠 💰 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 Software Engineer (Node.js & React Native) Permanent role 🚀 📍 Central London (4 days in-office, 1 day WFH) 🧠 Senior level (5+ years) 💼 Full-time 💸 Up to 95k Join a fast-growing fintech powering co-branded card programmes for leading travel and hospitality brands like Marriott International … issuing, payments infrastructure, and embedded loyalty to help partners unlock new revenue streams and deepen customer engagement. I am looking for a hands-on senior engineer who can: - Architect and scale backend services in Node.js - Lead development of a React Native app (iOS & Android) - Own technical direction across ...

Product focused Senior Software Engineer – High-Impact Software, Real Ownership London - Onsite Extremely competitive salary ranging between £100,000 to £200,000 depending on experience. Plus excellent benefits. This isn’t a bog standard software engineering role! I’m working with a product-led software … whose platform is used globally by highly technical users to solve real, complex problems in web security technology. They’re looking for Product focused Senior Software Engineers who care deeply about outcomes over output - engineers who want genuine ownership, autonomy, and the chance to build software that ...

Hiring: Senior Software Engineer – Systems Improvement & Scale 🏢 Company: Car Planet 📍 Location: Enfield 🕘 Full-Time (Open to initial contract trial) Car Planet is a fast-growing car supermarket and automotive retail business building and running our own in-house platforms — including Autogrid (our core Dealer Management System), plus … supporting systems like Audiofy (call intelligence) and RoutePortal (logistics & routing). We’re looking for a senior, pragmatic software engineer to inspect, stabilise, and improve live, revenue-critical systems as the business scales. You’ll work hands-on with existing production systems to improve performance, reliability ...

Senior Backend Engineer London - 4 days on site Up to £110k + benefits We're hiring for one of the UK's fastest growing fintech scale-ups. As a Senior Software Engineer, you will be deeply hands-on designing, building, deploying and operating scalable infrastructure ...