351 to 375 of 753 Software Engineering Jobs in the City of London

through trusted recommendations. We work with experienced founders, CTOs, and senior engineers who connect us with exceptional technical talent for high-growth companies. The Role We’re looking for Engineering Experts who match great people with great opportunities. It’s a fractional, flexible role, about 5 minutes a week , where you refer engineers, data scientists, or technical leads from … your network to startup roles. When someone you recommend gets hired, you earn a $5k–$10k success fee. Why join? Turn your engineering network into a new income stream Help top startups hire world-class technical talent Focus areas: software engineering, data, and AI roles We handle matching, outreach, vetting, and updates No fixed hours, no management … no pressure Who we want Seasoned technical professionals = founders, CTOs, or senior engineers, who’ve built, scaled, or invested in great engineering teams, and love connecting others with new opportunities. Apply We’ll review your background and network, and once accepted, you’ll start receiving referral opportunities and earning for the connections you already make. More ❯

collaborative team, staying close to the codebase and influence the technical roadmap in working on a nationwide product with millions of users. Job Requirements : Over 4 years experience in software engineering Experience with Scala and Javascript projects AWS is nice to have Strong communication skills Interview process: 1st stage interview, 2nd stage interview, Offer stage More ❯

collaborative team, staying close to the codebase and influence the technical roadmap in working on a nationwide product with millions of users. Job Requirements : Over 4 years experience in software engineering Experience with Scala and Javascript projects AWS is nice to have Strong communication skills Interview process: 1st stage interview, 2nd stage interview, Offer stage More ❯

funded early-stage startup looking to hire a Founding AI Engineer who can take them on to Series A. This is an opportunity to join a small, high-calibre engineering team that’s building production-grade AI systems used by real customers today. Revenue generating and with three years of runway, this is a solid opportunity for anyone who … retrieval systems using tools like LangChain, LangGraph, or custom frameworks. Own model evaluation frameworks to ensure quality, factuality, and performance across real-world workloads. Collaborate closely with the founding engineering team to build scalable infrastructure for AI-driven applications. Mentor mid-level engineers and help establish best practices around applied AI development and deployment. What We’re Looking For … 5+ years of professional software engineering experience, including 2–3+ years in AI/ML applications. Proven track record of shipping AI products into production (not just research or prototypes). Preferred tech stack - TypeScript, React, LangChain, and LLM orchestration. Experience with RAG systems , vector databases (e.g. Pinecone, PGVector, Weaviate), and model evaluation . Comfortable working in a More ❯

funded early-stage startup looking to hire a Founding AI Engineer who can take them on to Series A. This is an opportunity to join a small, high-calibre engineering team that’s building production-grade AI systems used by real customers today. Revenue generating and with three years of runway, this is a solid opportunity for anyone who … retrieval systems using tools like LangChain, LangGraph, or custom frameworks. Own model evaluation frameworks to ensure quality, factuality, and performance across real-world workloads. Collaborate closely with the founding engineering team to build scalable infrastructure for AI-driven applications. Mentor mid-level engineers and help establish best practices around applied AI development and deployment. What We’re Looking For … 5+ years of professional software engineering experience, including 2–3+ years in AI/ML applications. Proven track record of shipping AI products into production (not just research or prototypes). Preferred tech stack - TypeScript, React, LangChain, and LLM orchestration. Experience with RAG systems , vector databases (e.g. Pinecone, PGVector, Weaviate), and model evaluation . Comfortable working in a More ❯

to apply role-based security, authentication, and authorization measures within Power Apps. Awareness of organizational data compliance requirement. •Degree: Bachelor's degree or higher in computer science, information technology, software engineering or a related field •Experience: At least couple of years of experience in Qliksense development •Language: Fluent in English Seniority : Senior Mandatory work on site : remote is More ❯

to apply role-based security, authentication, and authorization measures within Power Apps. Awareness of organizational data compliance requirement. •Degree: Bachelor's degree or higher in computer science, information technology, software engineering or a related field •Experience: At least couple of years of experience in Qliksense development •Language: Fluent in English Seniority : Senior Mandatory work on site : remote is More ❯

the overall standard of the team. What you'll bring to the table: * A track record of building maintainable, scalable services and systems * Significant experience (10 years plus) in Software Engineering with very strong Python skills * A natural aptitude for mentoring, for leadership and for nurturing the careers of those working with you (Associate, Mid-Level and Senior More ❯

the overall standard of the team. What you'll bring to the table: * A track record of building maintainable, scalable services and systems * Significant experience (10 years plus) in Software Engineering with very strong Python skills * A natural aptitude for mentoring, for leadership and for nurturing the careers of those working with you (Associate, Mid-Level and Senior More ❯

against user needs. You enjoy collaborative work in a dynamic and creative environment. You are comfortable working with the different technical experts being part of a multidisciplinary team, guiding software engineers as they build your designs. A strong desire to co-create with users and relish participation of stakeholders and the wider team and have experience leading workshops and More ❯

against user needs. You enjoy collaborative work in a dynamic and creative environment. You are comfortable working with the different technical experts being part of a multidisciplinary team, guiding software engineers as they build your designs. A strong desire to co-create with users and relish participation of stakeholders and the wider team and have experience leading workshops and More ❯

and guide external developers or partners through early build stages. Jump in hands-on with coding, reviews, and technical design whenever needed. Build and lead a small, high-performing engineering team as the product scales. Make sure the platform is secure and fully compliant with KYC/AML and regulatory standards across the UAE and other key markets. Key …/trading/wealth products and customer journeys. Strong product intuition and ability to align tech with business goals. Capability to scale from individual contributor to leading a small engineering team. This is a full time role offering an attractive salary, flexible working and the opportunity to work on something truly greenfield and innovative. If you are interested or More ❯

and guide external developers or partners through early build stages. Jump in hands-on with coding, reviews, and technical design whenever needed. Build and lead a small, high-performing engineering team as the product scales. Make sure the platform is secure and fully compliant with KYC/AML and regulatory standards across the UAE and other key markets. Key …/trading/wealth products and customer journeys. Strong product intuition and ability to align tech with business goals. Capability to scale from individual contributor to leading a small engineering team. This is a full time role offering an attractive salary, flexible working and the opportunity to work on something truly greenfield and innovative. If you are interested or More ❯

Software Engineer Location: London Experience: 5–7 Years Industry: Market Making/Proprietary Trading/Capital Markets **Please note applicants coming from a buy side/trading/capital markets background will be given a strong preference** Looking for software engineers to join a small but highly skilled, and collaborative, bringing together expert traders and software engineers. … or Python (C++ a plus) Familiarity with databases (e.g., SQL Server, Postgres) Familiarity with developing, testing, or deploying with cloud providers (e.g., AWS, GCP, Azure) Experience using version control software (e.g., Git) Curiosity and a desire to solve challenging problems Strong programming ability A collaborative mindset and eagerness to give and receive feedback Excellent written and verbal communication skills More ❯

Software Engineer Location: London Experience: 5–7 Years Industry: Market Making/Proprietary Trading/Capital Markets **Please note applicants coming from a buy side/trading/capital markets background will be given a strong preference** Looking for software engineers to join a small but highly skilled, and collaborative, bringing together expert traders and software engineers. … or Python (C++ a plus) Familiarity with databases (e.g., SQL Server, Postgres) Familiarity with developing, testing, or deploying with cloud providers (e.g., AWS, GCP, Azure) Experience using version control software (e.g., Git) Curiosity and a desire to solve challenging problems Strong programming ability A collaborative mindset and eagerness to give and receive feedback Excellent written and verbal communication skills More ❯

About the Job Senior Software Engineer- Hybrid (2 days on site)- London- £100K+ Incredible Benefits Are you passionate about working with cutting-edge technology and looking to grow your skills in a forward-thinking environment? We’re currently looking for Senior Software Engineers who enjoy being hands-on and thrive on solving complex technical challenges. If you like … personal insurance space. The venture combines the agility and innovation of a start-up with the stability and backing of a major UK financial services provider. As a Senior Software Engineer , you’ll collaborate closely with Product Owners, subject matter experts, and other team members to deliver high-quality outcomes through continuous development and release cycles. You’ll help … shape best practices in engineering, improve development processes, and ensure robust design and code quality that meets both functional and non-functional requirements. Our Tech Stack: UI: Typescript, React, Next.Js, HTML/CSS, Docker, GitHub Actions, AWS- CDK, ECS, ALB, VPC. API's: Go, Rest, CDK. AWS- CDK, Lambda, API Gateway, Dynamo DB, Event Bridge, S3, Severless and event More ❯

About the Job Senior Software Engineer- Hybrid (2 days on site)- London- £100K+ Incredible Benefits Are you passionate about working with cutting-edge technology and looking to grow your skills in a forward-thinking environment? We’re currently looking for Senior Software Engineers who enjoy being hands-on and thrive on solving complex technical challenges. If you like … personal insurance space. The venture combines the agility and innovation of a start-up with the stability and backing of a major UK financial services provider. As a Senior Software Engineer , you’ll collaborate closely with Product Owners, subject matter experts, and other team members to deliver high-quality outcomes through continuous development and release cycles. You’ll help … shape best practices in engineering, improve development processes, and ensure robust design and code quality that meets both functional and non-functional requirements. Our Tech Stack: UI: Typescript, React, Next.Js, HTML/CSS, Docker, GitHub Actions, AWS- CDK, ECS, ALB, VPC. API's: Go, Rest, CDK. AWS- CDK, Lambda, API Gateway, Dynamo DB, Event Bridge, S3, Severless and event More ❯

Engineering Lead | Perm London | Hybrid (3 days onsite) £100,000 - £120,000 Harrington Starr has partnered with a leading global FinTech seeking an experienced Engineering Lead to join their London team. You’ll lead a small, high-performing engineering group building cloud-native enterprise software used worldwide. Key Responsibilities: Lead, mentor, and grow a team of … engineers. Design, build, and maintain scalable and secure systems. Champion engineering best practices (Agile, CI/CD, TDD). Collaborate with Product and Operations to deliver high-impact solutions. Key Benefits: Hybrid working model with London HQ. Competitive salary with bonus and generous holiday allowance. Private medical insurance and funded professional training. Inclusive, collaborative engineering culture with progression … opportunities. Key Requirements: Proven experience leading software development teams. Strong technical expertise in C#, Angular, and cloud platforms. Experience designing high-availability, performant cloud services. Excellent communication and stakeholder management skills For any additional questions, please contact me via LinkedIn or email - ollie.bluck@harringtonstarr.com If you feel this is the right role for you, please apply below More ❯

Engineering Lead | Perm London | Hybrid (3 days onsite) £100,000 - £120,000 Harrington Starr has partnered with a leading global FinTech seeking an experienced Engineering Lead to join their London team. You’ll lead a small, high-performing engineering group building cloud-native enterprise software used worldwide. Key Responsibilities: Lead, mentor, and grow a team of … engineers. Design, build, and maintain scalable and secure systems. Champion engineering best practices (Agile, CI/CD, TDD). Collaborate with Product and Operations to deliver high-impact solutions. Key Benefits: Hybrid working model with London HQ. Competitive salary with bonus and generous holiday allowance. Private medical insurance and funded professional training. Inclusive, collaborative engineering culture with progression … opportunities. Key Requirements: Proven experience leading software development teams. Strong technical expertise in C#, Angular, and cloud platforms. Experience designing high-availability, performant cloud services. Excellent communication and stakeholder management skills For any additional questions, please contact me via LinkedIn or email - ollie.bluck@harringtonstarr.com If you feel this is the right role for you, please apply below More ❯

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 as one of the 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 for global brands. Join a collaborative, innovative engineering culture where learning, experimentation, and technical excellence are at the core. Hybrid flexibility: 1–3 days … testing, and deploying RESTful APIs using frameworks like FastAPI or Django REST Framework . Collaborating with data and platform engineers to integrate new features and optimise performance. Ensuring robust engineering practices including CI/CD, TDD, and secure development . Supporting and mentoring junior engineers, helping raise the technical bar across the team. Staying hands-on while contributing to More ❯

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 as one of the 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 for global brands. Join a collaborative, innovative engineering culture where learning, experimentation, and technical excellence are at the core. Hybrid flexibility: 1–3 days … testing, and deploying RESTful APIs using frameworks like FastAPI or Django REST Framework . Collaborating with data and platform engineers to integrate new features and optimise performance. Ensuring robust engineering practices including CI/CD, TDD, and secure development . Supporting and mentoring junior engineers, helping raise the technical bar across the team. Staying hands-on while contributing to More ❯

Staff Software Engineer – AI/ML (Business Systems Intelligence) London (Hybrid – 2 days per week in office) An opportunity to take on a high-impact, hands-on leadership role within a scaling global SaaS company that’s using AI to reinvent how internal business systems and data work together. As a Staff Software Engineer (AI/ML) , you … ll be the technical lead for a newly formed AI Engineering function , designing and delivering the internal AI and data infrastructure that supports smarter decision-making across the organisation. You’ll build and scale AI-powered backend systems that connect enterprise data platforms (CRM, analytics, and communication tools) with large language models — creating intelligent tools and insights that enhance … deliver high-value AI applications. Mentor engineers and shape the company’s approach to internal AI enablement. What You’ll Bring 7+ years’ experience in backend or full-stack engineering, ideally within a SaaS or data-driven business. Strong knowledge of LLMs , prompt engineering, and fine-tuning approaches. Hands-on experience with AI/ML pipelines and vector More ❯

Staff Software Engineer – AI/ML (Business Systems Intelligence) London (Hybrid – 2 days per week in office) An opportunity to take on a high-impact, hands-on leadership role within a scaling global SaaS company that’s using AI to reinvent how internal business systems and data work together. As a Staff Software Engineer (AI/ML) , you … ll be the technical lead for a newly formed AI Engineering function , designing and delivering the internal AI and data infrastructure that supports smarter decision-making across the organisation. You’ll build and scale AI-powered backend systems that connect enterprise data platforms (CRM, analytics, and communication tools) with large language models — creating intelligent tools and insights that enhance … deliver high-value AI applications. Mentor engineers and shape the company’s approach to internal AI enablement. What You’ll Bring 7+ years’ experience in backend or full-stack engineering, ideally within a SaaS or data-driven business. Strong knowledge of LLMs , prompt engineering, and fine-tuning approaches. Hands-on experience with AI/ML pipelines and vector More ❯

Full-Stack Software Engineer – C# .NET Business area: Platform Development team Permanent, Hybrid working Located: London, City *Priority hire, so moving quickly!* Talensa are working with a market leading Financial Trading platform company in the City looking to add a talented C# .NET developer to support and drive through platform maintenance, development and innovative solutions for their Institutional clients. … great role, team and platform to work with!! Key tasks and responsibilities · Development and Testing: Develop new features, write unit and E2E tests and maintain the company's main software platform. · Coding Practices and Quality: Follow industry coding standards, striving for high-quality, self-documented code. · Debugging and Troubleshooting: Analyze issues, debug critical errors, and resolve bugs. · Better Engineering More ❯

Full-Stack Software Engineer – C# .NET Business area: Platform Development team Permanent, Hybrid working Located: London, City *Priority hire, so moving quickly!* Talensa are working with a market leading Financial Trading platform company in the City looking to add a talented C# .NET developer to support and drive through platform maintenance, development and innovative solutions for their Institutional clients. … great role, team and platform to work with!! Key tasks and responsibilities · Development and Testing: Develop new features, write unit and E2E tests and maintain the company's main software platform. · Coding Practices and Quality: Follow industry coding standards, striving for high-quality, self-documented code. · Debugging and Troubleshooting: Analyze issues, debug critical errors, and resolve bugs. · Better Engineering More ❯