26 to 50 of 65 Senior Software Engineer Jobs in the City of London

Senior Software Engineer - Artificial Intelligence - London - £100,000 - £150,000 base + Equity We are working with an ambitious, well-funded defence technology company revolutionising how organisations collaborate with sensors, robots, and autonomous systems. This is a pivotal moment to join a high-calibre team solving some of the most complex and consequential problems in the field. … and influence over design, functionality, and direction, no layers of bureaucracy, just the opportunity to make a tangible impact. About the Role You will design, build, and test core software platforms and user interfaces. This includes deploying and testing with autonomous and robotic systems in the field, writing maintainable code for mission-critical environments, integrating with third-party APIs … alongside real systems. Required Skills Degree in Computer Science, Engineering, or a related technical field (or equivalent experience) Strong programming skills in C++, Rust, Java 8+ years of professional software engineering experience Preferred Skills Experience with autonomous systems and robotics Benefits Mission & impact: Build software directly supporting defence and humanitarian operations Ownership: Shape architecture, product direction, and team More ❯

Senior Software Engineer - Artificial Intelligence - London - £100,000 - £150,000 base + Equity We are working with an ambitious, well-funded defence technology company revolutionising how organisations collaborate with sensors, robots, and autonomous systems. This is a pivotal moment to join a high-calibre team solving some of the most complex and consequential problems in the field. … and influence over design, functionality, and direction, no layers of bureaucracy, just the opportunity to make a tangible impact. About the Role You will design, build, and test core software platforms and user interfaces. This includes deploying and testing with autonomous and robotic systems in the field, writing maintainable code for mission-critical environments, integrating with third-party APIs … alongside real systems. Required Skills Degree in Computer Science, Engineering, or a related technical field (or equivalent experience) Strong programming skills in C++, Rust, Java 8+ years of professional software engineering experience Preferred Skills Experience with autonomous systems and robotics Benefits Mission & impact: Build software directly supporting defence and humanitarian operations Ownership: Shape architecture, product direction, and team More ❯

Senior C# Engineer – City of London (On-site) Permanent | £90,000 – £120,000 We’re partnered with an innovative proprietary trading firm in the City of London that is hiring a Senior C# Software Engineer . You’ll work on greenfield projects, cutting-edge technology, and play a key part in shaping systems that directly More ❯

Senior C# Engineer – City of London (On-site) Permanent | £90,000 – £120,000 We’re partnered with an innovative proprietary trading firm in the City of London that is hiring a Senior C# Software Engineer . You’ll work on greenfield projects, cutting-edge technology, and play a key part in shaping systems that directly More ❯

Senior Software Engineer - London - £120k Please note - this role will require you to work from the London based office three days per week. You must have the unrestricted right to work in the UK to be eligible for this role - this organisation is not able to offer sponsorship. Are you passionate about building cutting-edge technology solutions … building out our new front-end analytics platform, delivering intuitive, high-performance tools that empower users with real-time insights and advanced visualization capabilities. Collaborate with commercial teams to engineer and optimize processes and analytical models. Build and maintain Python-based services and APIs using modern frameworks and best practices. Develop solutions for data modeling, market analysis, and position More ❯

Senior Software Engineer – Shopify/FinTech Integrations Full Stack ( Backend-leaning | TypeScript ) London/Hybrid – 1 day per week in-office Up to £90k DOE + MacBook Pro + £600 wellbeing allowance 🚫 Visa sponsorship not available Join a VC-backed, fast-growing startup that’s redefining how customers shop for luxury fashion online. Backed by top-tier More ❯

Senior Software Engineer – Shopify/FinTech Integrations Full Stack ( Backend-leaning | TypeScript ) London/Hybrid – 1 day per week in-office Up to £90k DOE + MacBook Pro + £600 wellbeing allowance 🚫 Visa sponsorship not available Join a VC-backed, fast-growing startup that’s redefining how customers shop for luxury fashion online. Backed by top-tier More ❯

Senior C++ Software Engineer Salary: £75,000 - £135,000 Key Responsibilities Design, develop, and optimize software in C++ and/or Rust for control and orchestration systems. Build low-latency interfaces between hardware and classical compute systems. Collaborate with hardware teams to integrate software with FPGAs and high-speed digital electronics. Develop and maintain firmware … platforms. Analyze and optimize system performance including latency, throughput, and resource utilization. Participate in system architecture design and technical decision-making. Conduct code reviews , mentor junior engineers, and promote software best practices. Work with cross-functional teams to ensure seamless integration of hardware and software components for robust, production-ready systems. Ensure system reliability , fault tolerance , and performance … in data centre environments. Required Qualifications Bachelor's or Master's degree in Computer Engineering , Electrical Engineering , Physics , or a related field. 5+ years of professional experience in software development, with a focus on C++ and/or Rust . Strong understanding of FPGA architectures , toolchains (e.g., Xilinx Vivado, Intel Quartus), and hardware description languages ( VHDL/Verilog ). More ❯

a seamless experience that emphasises simplicity, efficiency, and rapid execution. Our goal is to remove obstacles, enabling you to achieve success faster and more effectively. Role Overview As a Senior Software Engineer, you will play a pivotal role in architecting and developing our next-generation web application and API. This role requires technical leadership, hands-on development … and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance. If you are passionate about software development, enjoy solving complex problems, and are ready to lead innovative projects, we encourage you to apply. Join our dynamic team and contribute to building transformative solutions that make a tangible impact. This role will … Qualifications and Key Skills Education: Bachelor’s in Computer Science or related field from a Tier 1 university. Experience: Minimum of 4 years of full-time professional experience in software development, with strong expertise in TypeScript, ReactJS, and Next.JS. Solid experience in building RESTful APIs Leadership: Proven track record of leading development teams and managing large-scale projects. Database More ❯

a seamless experience that emphasises simplicity, efficiency, and rapid execution. Our goal is to remove obstacles, enabling you to achieve success faster and more effectively. Role Overview As a Senior Software Engineer, you will play a pivotal role in architecting and developing our next-generation web application and API. This role requires technical leadership, hands-on development … and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance. If you are passionate about software development, enjoy solving complex problems, and are ready to lead innovative projects, we encourage you to apply. Join our dynamic team and contribute to building transformative solutions that make a tangible impact. This role will … Qualifications and Key Skills Education: Bachelor’s in Computer Science or related field from a Tier 1 university. Experience: Minimum of 4 years of full-time professional experience in software development, with strong expertise in TypeScript, ReactJS, and Next.JS. Solid experience in building RESTful APIs Leadership: Proven track record of leading development teams and managing large-scale projects. Database More ❯

Senior C++ Software Engineer - Architect Are you a postive person who looks to continously improve themselves, their Code and ways of working? Would you like to see your Code make our World a better place for all? How would you like to contribute to a Multi Award Winning Company, who’s products serve the greater good for More ❯

Senior C++ Software Engineer - Architect Are you a postive person who looks to continously improve themselves, their Code and ways of working? Would you like to see your Code make our World a better place for all? How would you like to contribute to a Multi Award Winning Company, who’s products serve the greater good for More ❯

now entering an exciting scale-up phase. This is a unique opportunity to join and directly shape a pioneering consumer product. Role Overview We are looking for an outstanding Senior Software Engineer to join our fast-moving journey. You’ll be a key contributor across the stack in our Rust-based environment, building intuitive experiences and scalable … code reviews, mentor engineers, and support hiring as we grow Take ownership from concept to delivery, including infrastructure (deployments, observability, CI/CD) Must-Have Qualifications 5+ years in software engineering (flexible if skills and impact are strong) Strong foundations in typed languages (e.g., C++, Scala, Rust, Java, C#, Swift) Strong understanding of core programming concepts, including variable assignments More ❯

now entering an exciting scale-up phase. This is a unique opportunity to join and directly shape a pioneering consumer product. Role Overview We are looking for an outstanding Senior Software Engineer to join our fast-moving journey. You’ll be a key contributor across the stack in our Rust-based environment, building intuitive experiences and scalable … code reviews, mentor engineers, and support hiring as we grow Take ownership from concept to delivery, including infrastructure (deployments, observability, CI/CD) Must-Have Qualifications 5+ years in software engineering (flexible if skills and impact are strong) Strong foundations in typed languages (e.g., C++, Scala, Rust, Java, C#, Swift) Strong understanding of core programming concepts, including variable assignments More ❯

Senior DevOps Engineer – Real-time Market Data. Certain Advantage are hiring for a DevOps Engineer to join one of the world’s leading global energy trading organisation. This role is offered on an initial 6-month contract basis , with hybrid working and excellent exposure to front-office trading operations. You will: Troubleshoot and resolve issues across development More ❯

Senior DevOps Engineer – Real-time Market Data. Certain Advantage are hiring for a DevOps Engineer to join one of the world’s leading global energy trading organisation. This role is offered on an initial 6-month contract basis , with hybrid working and excellent exposure to front-office trading operations. You will: Troubleshoot and resolve issues across development More ❯

We refer top candidates to our partners working with the world’s leading AI research labs and fast-growing startups to help build cutting-edge technology. Role: LLM - Sr. Software Engineer – LLM Evaluation & Repository Validation Type of Role: Short-term Contract Engagement Duration: 1 month (with possible extensions) Commitment: 10–40 hrs/week (flexible, partial PST overlap … Date: Immediate Rate Range: $80–$125/hour Project Overview We’re building high-quality evaluation and training datasets to improve how Large Language Models (LLMs) interact with realistic software engineering tasks. Engineers will work on diverse projects such as enabling models to traverse complex code bases or building agents that boost model performance. Role Overview — What Does a … per task using a structured ranking system. Evaluate code diffs for correctness, quality, style, and efficiency. Provide clear, structured rationales for evaluation decisions. Required Skills & Experience Several years of software engineering experience , including 1 + continuous years at product companies Strong expertise in Rust development and deploying scalable, production-grade software. Deep understanding of software architecture, debugging, and More ❯

with the Machine Learning team to understand the underlying concepts and user flows; however, you are not required or expected to have background in Machine Learning. This is a senior-level role, and we are looking to hire a software engineer with background in product design, UI/UX design, and with a strong sense of aesthetics. … experience: Experience with a startup work environment and wider ecosystem. Why join us? Work in an environment conducting cutting-edge research in AI. An official role title of “Founding Engineer” – make an impact on day one. Competitive salary, equity and benefits package. 28 days + public holidays allowance. Opportunities for professional growth and progression with your career. Work on More ❯

with the Machine Learning team to understand the underlying concepts and user flows; however, you are not required or expected to have background in Machine Learning. This is a senior-level role, and we are looking to hire a software engineer with background in product design, UI/UX design, and with a strong sense of aesthetics. … experience: Experience with a startup work environment and wider ecosystem. Why join us? Work in an environment conducting cutting-edge research in AI. An official role title of “Founding Engineer” – make an impact on day one. Competitive salary, equity and benefits package. 28 days + public holidays allowance. Opportunities for professional growth and progression with your career. Work on More ❯

Role Outline Engineered Arts is seeking a Senior Robot Systems Software Engineer to work on the code that runs directly on our humanoid robots, the glue between sensors, actuators, and cloud services. You’ll build and maintain the real-time and near-real-time systems that make our robots come alive: coordinating motion, perception, speech, and networked … behaviour. This role suits someone who enjoys hands-on debugging, understands hardware–software interaction, and thrives in a multidisciplinary environment spanning mechanical, electrical, and software engineering. Main Responsibilities On-Robot Software Development Design, implement and maintain modules running on Linux-based robot computers (Python, C++, Rust). Interface with sensors, actuators, and controllers over serial, USB, and … in deployed robots. Qualifications, Knowledge, Key Skills and Experience Essential Bachelor’s or Master’s in Computer Science, Robotics, Electrical/Mechatronics Engineering, or related field Significant experience developing software for hardware-integrated systems (e.g. robotics, IoT, or embedded Linux) Strong programming skills (Preferably Python, Rust and C++) Excellent debugging and profiling ability across system layers Familiarity with Linux More ❯

Role Outline Engineered Arts is seeking a Senior Robot Systems Software Engineer to work on the code that runs directly on our humanoid robots, the glue between sensors, actuators, and cloud services. You’ll build and maintain the real-time and near-real-time systems that make our robots come alive: coordinating motion, perception, speech, and networked … behaviour. This role suits someone who enjoys hands-on debugging, understands hardware–software interaction, and thrives in a multidisciplinary environment spanning mechanical, electrical, and software engineering. Main Responsibilities On-Robot Software Development Design, implement and maintain modules running on Linux-based robot computers (Python, C++, Rust). Interface with sensors, actuators, and controllers over serial, USB, and … in deployed robots. Qualifications, Knowledge, Key Skills and Experience Essential Bachelor’s or Master’s in Computer Science, Robotics, Electrical/Mechatronics Engineering, or related field Significant experience developing software for hardware-integrated systems (e.g. robotics, IoT, or embedded Linux) Strong programming skills (Preferably Python, Rust and C++) Excellent debugging and profiling ability across system layers Familiarity with Linux More ❯

mandate: Our client—a global, multi-asset investment manager—has rolled out cutting-edge large-language-model coding assistants across its Risk & Portfolio-Tech organisation. They now need a senior engineer who can turn “moon-shot” ideas into production tools , guiding the business on what LLMs can really do and delivering rapid-fire prototypes that become mission-critical More ❯

at https://www.eunice.ai! About the role At Eunice, we are building the trusted infrastructure for digital assets and tokenized finance. We’re looking for a full-stack software engineer to join our fast-growing startup. This is an exciting opportunity for someone who enjoys a fast paced environment; loves the challenge to solve some of the … knowledge in at least one popular coding language for building web-based applications on both FE and BE, ideally Typescript, Javascript/NodeJS, etc. You have experience with common software and system design patterns and infrastructure including APIs, cloud infrastructure tools, storage solutions, data structures etc. Ideally you have experience working on AI/Crypto projects, or you are More ❯

at https://www.eunice.ai! About the role At Eunice, we are building the trusted infrastructure for digital assets and tokenized finance. We’re looking for a full-stack software engineer to join our fast-growing startup. This is an exciting opportunity for someone who enjoys a fast paced environment; loves the challenge to solve some of the … knowledge in at least one popular coding language for building web-based applications on both FE and BE, ideally Typescript, Javascript/NodeJS, etc. You have experience with common software and system design patterns and infrastructure including APIs, cloud infrastructure tools, storage solutions, data structures etc. Ideally you have experience working on AI/Crypto projects, or you are More ❯

Senior Back End Engineer. Tech stack: TypeScript, React, Node Day rate: £500-650/day, outside IR35 Office: 3 days in London A rapidly scaling Tech4Good business, working closely with AI, is looking for experienced Engineers to join their Back End and product-centric team. The role involves working in a collaborative environment on meaningful Engineering challenges, which impact More ❯