2,576 to 2,600 of 6,733 Permanent Software Engineering Jobs

Senior C# Developer/Backend Software Engineer (C# .Net Core) *Newcastle onsite* to £130k+ Are you a backend focused C# Developer with a strong academic background, looking to take the next step in your career? This is an opportunity to work on complex, high-impact systems at a growing FinTech scale-up with solid financial backing, a major Hedge … problem solving, working on complex, distributed systems You have expertise with modern C# .Net Core, Python skills would also be of benefit You have a strong knowledge of modern software engineering best practices and have experience across the full software development lifecycle You have a thorough understanding of Computer Science fundamentals such as OOP, Data Structures, Design … re excited to join a start-up in a role that you can shape and influence Apply now to find out more about this Senior C# Developer/Backend Software Engineer (C# .Net Core) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal More ❯

Role: Python Software Developer - Treasury Location: London Industry: Hedge Funds Overview: A global multi-strategy hedge fund is looking to add an experienced Python Developer to join their Treasury team in London. The firm operates at hedge fund scale with a start-up pace, focusing on building high-performance trading platforms. In this role, you will design and develop … systems, ensuring uptime and quick incident response. Identify technology gaps and inefficiencies, experimenting with new tools and design patterns to enhance speed and quality. Experience: 5-15 years of software engineering experience, ideally in Treasury or from a hedge fund/buy-side firm Expertise in Python for designing and optimising complex applications Strong proficiency in data tools More ❯

experienced in Computer Science, Artificial Intelligence, or Data Science. Skills in Python, JavaScript, React, or AI frameworks (TensorFlow, PyTorch, OpenAI APIs) . Curious, creative, and passionate about responsible AI. 💻 Software Developer Internship Join the engineering team developing the technical backbone of the RTN Zero.AI platform — from front-end dashboards to backend systems. What You’ll Do: Develop web … and system integrations. Work on APIs, databases, and deployment pipelines. Ensure code quality, security, and scalability. Collaborate closely with product and sustainability teams. Ideal Background: Studying or experienced in Software Engineering, Computer Science, or Design. Familiar with Python, TypeScript, React, Node.js, GitHub , and cloud tools. Eager to learn and build sustainable, user-focused software. 🌿 Business Sustainability Internship Support More ❯

Role: Python Software Developer - Treasury Location: London Industry: Hedge Funds Overview: A global multi-strategy hedge fund is looking to add an experienced Python Developer to join their Treasury team in London. The firm operates at hedge fund scale with a start-up pace, focusing on building high-performance trading platforms. In this role, you will design and develop … systems, ensuring uptime and quick incident response. Identify technology gaps and inefficiencies, experimenting with new tools and design patterns to enhance speed and quality. Experience: 5-15 years of software engineering experience, ideally in Treasury or from a hedge fund/buy-side firm Expertise in Python for designing and optimising complex applications Strong proficiency in data tools More ❯

Role: Python Software Developer - Treasury Location: London Industry: Hedge Funds Overview: A global multi-strategy hedge fund is looking to add an experienced Python Developer to join their Treasury team in London. The firm operates at hedge fund scale with a start-up pace, focusing on building high-performance trading platforms. In this role, you will design and develop … systems, ensuring uptime and quick incident response. Identify technology gaps and inefficiencies, experimenting with new tools and design patterns to enhance speed and quality. Experience: 5-15 years of software engineering experience, ideally in Treasury or from a hedge fund/buy-side firm Expertise in Python for designing and optimising complex applications Strong proficiency in data tools More ❯

experienced in Computer Science, Artificial Intelligence, or Data Science. Skills in Python, JavaScript, React, or AI frameworks (TensorFlow, PyTorch, OpenAI APIs) . Curious, creative, and passionate about responsible AI. 💻 Software Developer Internship Join the engineering team developing the technical backbone of the RTN Zero.AI platform — from front-end dashboards to backend systems. What You’ll Do: Develop web … and system integrations. Work on APIs, databases, and deployment pipelines. Ensure code quality, security, and scalability. Collaborate closely with product and sustainability teams. Ideal Background: Studying or experienced in Software Engineering, Computer Science, or Design. Familiar with Python, TypeScript, React, Node.js, GitHub , and cloud tools. Eager to learn and build sustainable, user-focused software. 🌿 Business Sustainability Internship Support More ❯

experienced in Computer Science, Artificial Intelligence, or Data Science. Skills in Python, JavaScript, React, or AI frameworks (TensorFlow, PyTorch, OpenAI APIs) . Curious, creative, and passionate about responsible AI. 💻 Software Developer Internship Join the engineering team developing the technical backbone of the RTN Zero.AI platform — from front-end dashboards to backend systems. What You’ll Do: Develop web … and system integrations. Work on APIs, databases, and deployment pipelines. Ensure code quality, security, and scalability. Collaborate closely with product and sustainability teams. Ideal Background: Studying or experienced in Software Engineering, Computer Science, or Design. Familiar with Python, TypeScript, React, Node.js, GitHub , and cloud tools. Eager to learn and build sustainable, user-focused software. 🌿 Business Sustainability Internship Support More ❯

Senior Software Engineer – Fullstack/Backend Leaning (TypeScript, Node.js, React, AWS) Full-time | London (Hybrid) Our client is a well-funded, high-growth FinTech SaaS business redefining how private equity operates. The platform empowers investment professionals through automation and intelligent collaboration, replacing the manual, fragmented processes that have long dominated the industry. Founded by seasoned private equity and technology … the company is entering an exciting scale-up phase with proven product-market fit, strong industry adoption, and a clear multi-product roadmap. We’re seeking an experienced Senior Software Engineer who thrives in dynamic, scaling environments and enjoys building robust, enterprise-grade SaaS platforms. You’ll help shape architecture, deliver new features end-to-end, and contribute to … technical strategy in a lean, high-calibre engineering team. What You’ll Do Design and build scalable backend and fullstack solutions in Node.js, TypeScript, React, AWS Collaborate closely on architecture, data models, and API design (REST, GraphQL, tRPC, WebSockets) Balance speed with long-term maintainability — quality and performance matter here Work on innovative challenges across document parsing, data visualisation More ❯

Senior Software Engineer – Fullstack/Backend Leaning (TypeScript, Node.js, React, AWS) Full-time | London (Hybrid) Our client is a well-funded, high-growth FinTech SaaS business redefining how private equity operates. The platform empowers investment professionals through automation and intelligent collaboration, replacing the manual, fragmented processes that have long dominated the industry. Founded by seasoned private equity and technology … the company is entering an exciting scale-up phase with proven product-market fit, strong industry adoption, and a clear multi-product roadmap. We’re seeking an experienced Senior Software Engineer who thrives in dynamic, scaling environments and enjoys building robust, enterprise-grade SaaS platforms. You’ll help shape architecture, deliver new features end-to-end, and contribute to … technical strategy in a lean, high-calibre engineering team. What You’ll Do Design and build scalable backend and fullstack solutions in Node.js, TypeScript, React, AWS Collaborate closely on architecture, data models, and API design (REST, GraphQL, tRPC, WebSockets) Balance speed with long-term maintainability — quality and performance matter here Work on innovative challenges across document parsing, data visualisation More ❯

Founding Software Engineer (React and Python) About the Opportunity You will be joining an elite founding engineering team that includes the world’s number one authority in Multi Agent Reinforcement Learning, seasoned Meta Product leaders, and one of the only people in the UK who has trained a trillion token language model from scratch. This role is based … offers a top tier salary plus equity package to reflect the strategic and high impact nature of the work. Why This Role Matters You are part of the initial engineering core, playing a pivotal role in shaping and scaling the technology platform from the ground up. You will work alongside leading researchers and product strategists at the intersection of … including data pipelines, model versioning, monitoring, automated deployment and continuous integration • Drive end to end ownership from ideation to deployment, performance and scaling • Mentor future hires and define scalable engineering culture, processes and tooling Candidate Profile • Proven track record (five plus years) in engineering roles involving scalable, machine learning intensive systems whether via start ups or technology critical More ❯

Founding Software Engineer (React and Python) About the Opportunity You will be joining an elite founding engineering team that includes the world’s number one authority in Multi Agent Reinforcement Learning, seasoned Meta Product leaders, and one of the only people in the UK who has trained a trillion token language model from scratch. This role is based … offers a top tier salary plus equity package to reflect the strategic and high impact nature of the work. Why This Role Matters You are part of the initial engineering core, playing a pivotal role in shaping and scaling the technology platform from the ground up. You will work alongside leading researchers and product strategists at the intersection of … including data pipelines, model versioning, monitoring, automated deployment and continuous integration • Drive end to end ownership from ideation to deployment, performance and scaling • Mentor future hires and define scalable engineering culture, processes and tooling Candidate Profile • Proven track record (five plus years) in engineering roles involving scalable, machine learning intensive systems whether via start ups or technology critical More ❯

Founding Software Engineer (React and Python) About the Opportunity You will be joining an elite founding engineering team that includes the world’s number one authority in Multi Agent Reinforcement Learning, seasoned Meta Product leaders, and one of the only people in the UK who has trained a trillion token language model from scratch. This role is based … offers a top tier salary plus equity package to reflect the strategic and high impact nature of the work. Why This Role Matters You are part of the initial engineering core, playing a pivotal role in shaping and scaling the technology platform from the ground up. You will work alongside leading researchers and product strategists at the intersection of … including data pipelines, model versioning, monitoring, automated deployment and continuous integration • Drive end to end ownership from ideation to deployment, performance and scaling • Mentor future hires and define scalable engineering culture, processes and tooling Candidate Profile • Proven track record (five plus years) in engineering roles involving scalable, machine learning intensive systems whether via start ups or technology critical More ❯

Senior Software Engineer – Fullstack/Backend Leaning (TypeScript, Node.js, React, AWS) Full-time | London (Hybrid) Our client is a well-funded, high-growth FinTech SaaS business redefining how private equity operates. The platform empowers investment professionals through automation and intelligent collaboration, replacing the manual, fragmented processes that have long dominated the industry. Founded by seasoned private equity and technology … the company is entering an exciting scale-up phase with proven product-market fit, strong industry adoption, and a clear multi-product roadmap. We’re seeking an experienced Senior Software Engineer who thrives in dynamic, scaling environments and enjoys building robust, enterprise-grade SaaS platforms. You’ll help shape architecture, deliver new features end-to-end, and contribute to … technical strategy in a lean, high-calibre engineering team. What You’ll Do Design and build scalable backend and fullstack solutions in Node.js, TypeScript, React, AWS Collaborate closely on architecture, data models, and API design (REST, GraphQL, tRPC, WebSockets) Balance speed with long-term maintainability — quality and performance matter here Work on innovative challenges across document parsing, data visualisation More ❯

Founding Software Engineer (React and Python) About the Opportunity You will be joining an elite founding engineering team that includes the world’s number one authority in Multi Agent Reinforcement Learning, seasoned Meta Product leaders, and one of the only people in the UK who has trained a trillion token language model from scratch. This role is based … offers a top tier salary plus equity package to reflect the strategic and high impact nature of the work. Why This Role Matters You are part of the initial engineering core, playing a pivotal role in shaping and scaling the technology platform from the ground up. You will work alongside leading researchers and product strategists at the intersection of … including data pipelines, model versioning, monitoring, automated deployment and continuous integration • Drive end to end ownership from ideation to deployment, performance and scaling • Mentor future hires and define scalable engineering culture, processes and tooling Candidate Profile • Proven track record (five plus years) in engineering roles involving scalable, machine learning intensive systems whether via start ups or technology critical More ❯

Founding Software Engineer (React and Python) About the Opportunity You will be joining an elite founding engineering team that includes the world’s number one authority in Multi Agent Reinforcement Learning, seasoned Meta Product leaders, and one of the only people in the UK who has trained a trillion token language model from scratch. This role is based … offers a top tier salary plus equity package to reflect the strategic and high impact nature of the work. Why This Role Matters You are part of the initial engineering core, playing a pivotal role in shaping and scaling the technology platform from the ground up. You will work alongside leading researchers and product strategists at the intersection of … including data pipelines, model versioning, monitoring, automated deployment and continuous integration • Drive end to end ownership from ideation to deployment, performance and scaling • Mentor future hires and define scalable engineering culture, processes and tooling Candidate Profile • Proven track record (five plus years) in engineering roles involving scalable, machine learning intensive systems whether via start ups or technology critical More ❯

Senior Software Engineer – Fullstack/Backend Leaning (TypeScript, Node.js, React, AWS) Full-time | London (Hybrid) Our client is a well-funded, high-growth FinTech SaaS business redefining how private equity operates. The platform empowers investment professionals through automation and intelligent collaboration, replacing the manual, fragmented processes that have long dominated the industry. Founded by seasoned private equity and technology … the company is entering an exciting scale-up phase with proven product-market fit, strong industry adoption, and a clear multi-product roadmap. We’re seeking an experienced Senior Software Engineer who thrives in dynamic, scaling environments and enjoys building robust, enterprise-grade SaaS platforms. You’ll help shape architecture, deliver new features end-to-end, and contribute to … technical strategy in a lean, high-calibre engineering team. What You’ll Do Design and build scalable backend and fullstack solutions in Node.js, TypeScript, React, AWS Collaborate closely on architecture, data models, and API design (REST, GraphQL, tRPC, WebSockets) Balance speed with long-term maintainability — quality and performance matter here Work on innovative challenges across document parsing, data visualisation More ❯

Senior Software Engineer – Fullstack/Backend Leaning (TypeScript, Node.js, React, AWS) Full-time | London (Hybrid) Our client is a well-funded, high-growth FinTech SaaS business redefining how private equity operates. The platform empowers investment professionals through automation and intelligent collaboration, replacing the manual, fragmented processes that have long dominated the industry. Founded by seasoned private equity and technology … the company is entering an exciting scale-up phase with proven product-market fit, strong industry adoption, and a clear multi-product roadmap. We’re seeking an experienced Senior Software Engineer who thrives in dynamic, scaling environments and enjoys building robust, enterprise-grade SaaS platforms. You’ll help shape architecture, deliver new features end-to-end, and contribute to … technical strategy in a lean, high-calibre engineering team. What You’ll Do Design and build scalable backend and fullstack solutions in Node.js, TypeScript, React, AWS Collaborate closely on architecture, data models, and API design (REST, GraphQL, tRPC, WebSockets) Balance speed with long-term maintainability — quality and performance matter here Work on innovative challenges across document parsing, data visualisation More ❯

to play a pivotal role in shaping a modern suite of web applications for a fast-growing payments and fintech platform. This is an opportunity to combine hands-on engineering with technical leadership - designing, building, and guiding teams delivering next-generation digital experiences. What you’ll do Lead front-end development for key product initiatives, working across modern frameworks … development practices. Drive improvement across tooling, automation, and delivery processes. Mentor engineers and contribute to a collaborative, outcomes-focused culture. What we’re looking for 10+ years’ experience in software engineering, with deep expertise in modern front-end technologies (React, TypeScript, ES6+, HTML/CSS). Proven track record in building and optimising complex, data-driven web applications. More ❯

We are partnering with an early-stage, mission-driven company at the intersection of AI and national defence to appoint exceptional Full Stack Software Engineers . This fast-growing organisation is transforming mission-critical combat planning and operational decision-making by building next-generation AI-driven software tools for western forces. Founded in 2023, the company has already … a $10m Seed round in 2024. The founding team is composed of ex-Palantir and ex-Open AI leaders. They combine deep sector knowledge with cutting-edge design and software engineering expertise to deliver state-of-the-art SaaS capabilities leveraging NLP, Generative AI, and reinforcement learning technologies. Position location (hybrid): London (Shoreditch) or Paris (Le Marais) We … as a hands-on individual contributor and problem-solver Requirements Degree in Computer Science or a related field, or equivalent experience 5+ years of experience working with cross-functional software development teams Experience shipping and iterating on production-grade software components professionally and/or in the open-source community Ability to write robust, well tested, and well More ❯

We are partnering with an early-stage, mission-driven company at the intersection of AI and national defence to appoint exceptional Full Stack Software Engineers . This fast-growing organisation is transforming mission-critical combat planning and operational decision-making by building next-generation AI-driven software tools for western forces. Founded in 2023, the company has already … a $10m Seed round in 2024. The founding team is composed of ex-Palantir and ex-Open AI leaders. They combine deep sector knowledge with cutting-edge design and software engineering expertise to deliver state-of-the-art SaaS capabilities leveraging NLP, Generative AI, and reinforcement learning technologies. Position location (hybrid): London (Shoreditch) or Paris (Le Marais) We … as a hands-on individual contributor and problem-solver Requirements Degree in Computer Science or a related field, or equivalent experience 5+ years of experience working with cross-functional software development teams Experience shipping and iterating on production-grade software components professionally and/or in the open-source community Ability to write robust, well tested, and well More ❯

We are partnering with an early-stage, mission-driven company at the intersection of AI and national defence to appoint exceptional Full Stack Software Engineers . This fast-growing organisation is transforming mission-critical combat planning and operational decision-making by building next-generation AI-driven software tools for western forces. Founded in 2023, the company has already … a $10m Seed round in 2024. The founding team is composed of ex-Palantir and ex-Open AI leaders. They combine deep sector knowledge with cutting-edge design and software engineering expertise to deliver state-of-the-art SaaS capabilities leveraging NLP, Generative AI, and reinforcement learning technologies. Position location (hybrid): London (Shoreditch) or Paris (Le Marais) We … as a hands-on individual contributor and problem-solver Requirements Degree in Computer Science or a related field, or equivalent experience 5+ years of experience working with cross-functional software development teams Experience shipping and iterating on production-grade software components professionally and/or in the open-source community Ability to write robust, well tested, and well More ❯

We are partnering with an early-stage, mission-driven company at the intersection of AI and national defence to appoint exceptional Full Stack Software Engineers . This fast-growing organisation is transforming mission-critical combat planning and operational decision-making by building next-generation AI-driven software tools for western forces. Founded in 2023, the company has already … a $10m Seed round in 2024. The founding team is composed of ex-Palantir and ex-Open AI leaders. They combine deep sector knowledge with cutting-edge design and software engineering expertise to deliver state-of-the-art SaaS capabilities leveraging NLP, Generative AI, and reinforcement learning technologies. Position location (hybrid): London (Shoreditch) or Paris (Le Marais) We … as a hands-on individual contributor and problem-solver Requirements Degree in Computer Science or a related field, or equivalent experience 5+ years of experience working with cross-functional software development teams Experience shipping and iterating on production-grade software components professionally and/or in the open-source community Ability to write robust, well tested, and well More ❯

We are partnering with an early-stage, mission-driven company at the intersection of AI and national defence to appoint exceptional Full Stack Software Engineers . This fast-growing organisation is transforming mission-critical combat planning and operational decision-making by building next-generation AI-driven software tools for western forces. Founded in 2023, the company has already … a $10m Seed round in 2024. The founding team is composed of ex-Palantir and ex-Open AI leaders. They combine deep sector knowledge with cutting-edge design and software engineering expertise to deliver state-of-the-art SaaS capabilities leveraging NLP, Generative AI, and reinforcement learning technologies. Position location (hybrid): London (Shoreditch) or Paris (Le Marais) We … as a hands-on individual contributor and problem-solver Requirements Degree in Computer Science or a related field, or equivalent experience 5+ years of experience working with cross-functional software development teams Experience shipping and iterating on production-grade software components professionally and/or in the open-source community Ability to write robust, well tested, and well More ❯

to AI-driven systems, and collaborate directly with an experienced senior engineer. Key Responsibilities Build and improve user interfaces using React + Tailwind + NextJS + Typescript Develop Python software and integrate AI workflows (LangGraph, REST APIs) Collaborate with backend engineers using Golang and PostgreSQL Participate in sprint planning, code reviews, and product discussions Help deliver end-to-end … is a plus Self-motivated, detail-oriented, and eager to learn fast in a startup environment Why Join Ruach Tech? Work on real, production-level systems that stretch your engineering abilities Receive mentorship directly from a Senior Software Engineer (AI & Systems) Build a strong portfolio with impactful projects and references Network with an innovative team that’s passionate More ❯

pioneer AI, data and automation in a high-impact environment. Enjoy a competitive graduate salary of up to £35,000, hybrid working, and exposure to real projects across marine engineering, diving, coastal infrastructure and more. This role is initially either a 12 month placement for someone in their final year of study, or a 2 year role with the … potential to lead to a permanent position for a recent graduate. About Us TMS Maritime is a UK leader in marine and civil engineering - delivering seawalls, quayside piling, dredging and turnkey infrastructure solutions across tidal, coastal and inland waterways. With over 31 years of experience, we pride ourselves on innovation, safety and delivering on complex, large-scale projects across … significant investment, giving us expanded capability and opportunity for digital growth. At TMS you will be part of a team delivering future-ready infrastructure, embracing tech within traditionally physical engineering environments. Whether it's modelling, optimisation, data analytics, predictive systems or AI tooling, your work will make a tangible difference to projects that protect communities, coastlines and waterways. The More ❯