1 to 25 of 89 Permanent Software Engineer Jobs in the City of London

Senior Product Engineer | Senior Software Engineer | Full Stack Engineer | Senior Software Engineer 🌍 Climate Tech Startup Scaling Real-World Carbon Removal 💰 Up to £95,000 + Equity 💻 C#, React, Python, Azure 📍 Hybrid/Flexible | London Waterloo We’re partnered with one of the most interesting … climate tech startups in the UK right now, a company building software and infrastructure to help scale large-scale carbon removal and sustainability initiatives globally. The business is entering a major growth phase and is building out a high-calibre engineering team to support that growth. They’re hiring ...

Senior Software Engineer | Media/Subscription | Headless CMS/Paywall Role: Senior Software Engineer Salary: £80,000 plus £10,000 bonus Remote working: 2 days in London office I am working with a B2B Start Up who are looking to hire a Senior Software Engineer … leadership team, you will report directly to the CEO, ensuring their technology stack is a driver of their commercial success. Key Responsibilities for Senior Software Engineer Technical Leadership: Own and maintain their core stack, including headless CMS (WordPress + DatoCMS), infrastructure (AWS/Heroku), and billing systems (Stripe ...

Senior Software Engineer C++ (Python, SQL, Linux, Trading, FinTech, Financial Technology, Low Latency, Backend) ***This is a hybrid role, 2 days remote and 3 days in the office*** Our client actively encourages diversity, equality and inclusion within its workforce and welcomes applications from a diverse background, REC 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. My client ...

Senior Software Engineer/Principal Software Engineer- C++, Python - Financial/Banking. Candidates will have a minimum 8+ years C++ experience and excellent knowledge of Python -coming from a Financial/Banking background with knowledge of Equities, Futures & Options and Fixed Income and Exchange Connectivity. … 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 ...

Principal Software Engineer/Developer (Java SpringBoot AWS) London/WFH to £120k Are you an experienced Java focussed Software Engineer, with technical project leadership and client facing skills? You could be progressing your career at a global technology consultancy. As a Principal Software Engineer … microservices environments You have a good knowledge of REST APIs You have a good understanding of AWS You have a thorough understanding of software development and Computer Science fundamentals such as Object Oriented Programming, Data Structures and Design Patterns You are familiar with DevOps, CI/CD pipelines ...

Software Engineer/Developer (C# .Net AWS) Relocate to Bermuda! Are you a full stack technologist with a product based mindset? You could be progressing your career in a life changing opportunity to relocate to Bermuda, in a hands-on Software Engineer role at a tech … driven, global Asset Manager with multiple billions of dollars under management. As a Software Engineer from day one, you will work on challenging, high-impact problems at the intersection of technology and global markets. You will design, build and operate performant, scalable systems that are critical ...

exciting opportunity for a Java Software Engineer has arisen with a leading semiconductor company specialising in high-performance mixed-signal processing, based in London. This is an exciting opportunity for a Java Software Engineer to design and evolve cross-platform applications, SDKs, and developer tooling. … work closely with UX specialists, hardware teams, and software engineers to build polished internal tools that power advanced hardware configuration and tuning workflows. You will commit to a hybrid working model, with a minimum of one day per week onsite in the London office. Experience for the Java Software ...

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 ...

Software Engineer - Up to £160,000 - London Title : Software Engineer Company : AI Startup Location : London Pay : Up to £160,000 Additional : Very strong stock options Company : A recently funded AI start up, spun out from an elite academic institution are looking to grow their software … features with direct impact on customer value Work with product and ML teams to help translate abstract and complex concepts into concrete software Own key architectural decisions Continually make incremental improvements to their systems Help the team scale by mentoring junior team members Play a significant role ...

Software Engineer London/Hybrid | Perm Role £60,000 - £80,000 Harrington Starr has partnered with a fast-growing fintech that’s transforming how businesses manage foreign exchange and treasury operations. Their technology enables clients to access institutional-grade execution, automate manual workflows, and gain greater transparency across … product offering and deliver cutting-edge solutions that help clients manage risk more effectively. The Role This is an excellent opportunity for an experienced Software Engineer — ideally with a background in financial technology or FX — to join a high-performing engineering team within a scaling fintech. ...

Software Engineer (Go) Location: London - 4 days per week onsite UK Visa Sponsorship: Not possible About the Company: Our client is a thriving B2B FinTech with a market leading product aimed at selling infrastructure to Financial Services firms, transforming how consumers manage their money. This is a fantastic … join the engineering team during an exciting phase of development. About the Role: As part of the company's expansion, they are seeking a Software Engineer to take a key role in building their complex backend systems. The ideal candidate will have a strong background in Object Oriented ...

Senior Software Engineer Engagement : Full‐Time Contractor Location : London/Hybrid Length: 12 month contract Role Summary We are seeking a software engineer specialising in distributed data systems to design and build low‐latency, high‐volume data processing solutions that underpin regulatory voice compliance assurance across … Bank’s strategic data platforms. This is a hands‐on software development role , focused on event‐driven architectures, streaming pipelines, and scalable data matching engines rather than traditional reporting or BI. You will engineer resilient, production‐grade systems capable of processing high‐frequency voice metadata and transactional records ...

Title: Senior Embedded Software Engineer Rank: Determined by the confirmed level and scope of experience Company: Chevalier Tech Limited Location: Colindale, Greater London (On-site) Job Type: Full-time, Permanent About Us Chevalier Tech Limited is a tier-one supplier specialising in advanced technology systems, primarily … Smart Door Handles, and Control Electronics, which are integrated into high-end passenger and super cars worldwide. About the Role As a highly Experienced Software Engineer , you will lead the software engineering team, play a pivotal role in the design, development, and implementation of embedded software ...

Software Engineer - Backend London (Occasional travel) Salary: Up to £85k + 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 … 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 Firestore, BigQuery, and Elasticsearch. Mentor and guide engineers at all levels, fostering a culture of technical excellence and continuous ...

Senior Software Engineer - Rust (Any Backend Language Accepted) Fastest Growing Start-up in the UK | Defense | Senior Software Engineer | Rust We are partnered with one of the UK's fastest-growing start-ups. They are a very technically focused group building cutting-edge decision-making technology. … years, and already have a lot of customers in the UK. On-site | London Up to 150,000 + Equity Senior/Principal Software Engineers: They're looking to add Senior/Principal Engineers to their team. The team are open to hiring pure backend engineers, or full-stack ...

Senior Software Engineer Are you a developer who loves building products, not just features? Do you thrive at the intersection of robust backend logic, intuitive frontend interfaces, and conversational AI? Are you excited to join a fast-growing, seed-funded startup transforming construction procurement? If you want … small, ambitious team of 10 that moves fast, trusts each other, and enjoys building genuinely impactful technology. Your Role As a Senior Software Engineer you won’t just be ticket-crunching. You will own the end-to-end experience of our platform. You’ll be responsible for architecting ...

Senior Software Engineer - Rust (Any Backend Language Accepted) Fastest Growing Start-up in the UK Defense Senior Software Engineer Rust We are partnered with one of the UK's fastest-growing start-ups. They are a very technically focused group building cutting-edge decision-making technology. ...

Software Engineer - Backend London (Occasional travel) Salary: Up to £85k + 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 click apply for full job details ...

Full Stack Software Engineer (Data-Focused) Location: London - Hybrid - 1-2 days per week Salary: £100-130k + Bonus Type: Permanent Sponsorship: Not Available Role Overview: We are seeking a Senior or Staff-Level Fullstack Software Engineer with a strong background in data to join … moving legacy products to a new technology stack Support documentation, testing, and ongoing maintenance of production systems Required Qualifications: 7+ years of experience in software engineering roles, with a track record of building solutions end-to-end Experience deploying applications in cloud environments, preferably Microsoft Azure Strong experience ...

Principal Full Stack Software Engineer Location: Hybrid - 1-2 days a week Salary: £110-130k + 10% Bonus Type: Permanent No Sponsorship Available Overview: We are seeking a Principal Full Stack Software Engineer to lead the design, development, and delivery of scalable, high-performance applications … This is a senior, hands-on leadership role where you will shape technical direction, influence engineering standards, and drive best practice across the full software development lifecycle. You will work closely with product, architecture, and leadership teams to deliver robust, user-centric solutions while mentoring engineers and fostering ...

Principal Scientific Software Engineer – Quantum Error Correction Location: Major US Tech Hub (Relocation Supported) Ready to help build the future of computing? Curious about shaping technology that could redefine science itself? Looking for a role where your work doesn’t just scale systems—but changes what’s possible … forefront of next-generation computing, working on breakthroughs that could transform industries from pharmaceuticals to climate modelling. They are now seeking a Principal Scientific Software Engineer to lead the evolution of a cutting-edge quantum error correction (QEC) software stack —a critical step toward making quantum computing ...

Full Stack Software Engineer (Data-Focused) Location: London - Hybrid - 1-2 days per week Salary: £100-130k + Bonus Type: Permanent Sponsorship: Not Available Role Overview: We are seeking a Senior or Staff-Level Fullstack Software Engineer with a strong background in data to join ...

Contract Senior Software Engineer (Java or Python) | Inside IR35 Contract length: 6 months (with potential to extend) Location: London Working Environment: On-site You will be joining a private equity firm as a senior software engineer, to work across the following responsibilities: Develop and support ...

Senior Software Engineer – AI/Agentic Systems London (Hybrid) We’re partnering with a cutting-edge AI startup redefining how intelligent systems operate at scale. Their mission is ambitious: to push the boundaries of agentic AI and build platforms that automate complex, multi-step human workflows—unlocking entirely … world-class AI talent, and directly shape a platform sitting at the intersection of research and real-world deployment. The Opportunity As a Senior Software Engineer , you’ll play a key role in building and scaling an enterprise-grade AI platform. You’ll operate at the core ...

services company with leading capabilities in digital, cloud, and security. Combining unmatched experience and specialized skills across more than 40 industries Role : AI Native Software Engineer Location: London, UK Work type: Hybrid Duration: 6 Months Job Summary: We are seeking a hands‐on AI Native Software Engineer … real business workflows. This is a 100% hands‐on engineering role, ideal for a senior technologist who thrives at the intersection of AI systems, software engineering, and cloud infrastructure. Key Responsibilities: Core Duties Design, implement, and maintain AI agent workflows, including retrieval‐augmented generation (RAG), orchestration, tool/function ...