Legacy Code Jobs in London

1 to 25 of 29 Legacy Code Jobs in London

Senior Software Engineer

London Area, United Kingdom
Burns Sheehan
to attract the best talent on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacy code or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus on being the worlds most More ❯
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Senior Software Engineer

City of London, London, United Kingdom
Burns Sheehan
to attract the best talent on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacy code or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus on being the worlds most More ❯
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Lead Software Engineer

City of London, London, United Kingdom
Burns Sheehan
to attract the best talent on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacy code or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus on being the worlds most More ❯
Posted:

Lead Software Engineer

London Area, United Kingdom
Burns Sheehan
to attract the best talent on the market. Having received huge investment, they are on a journey to truly disrupt the industry and are not held back by any legacy code or old customers. This means that they're able to build out state-of-the-art, Greenfield code which can focus on being the worlds most More ❯
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Senior Project Manager

City of London, London, United Kingdom
Robson Bale
Data Sovereignty Programme 6 month initial contract but likely to extend Market rate: Outside IR35 About the Role Our client has a 17-year-old monolithic application with significant Legacy complexity and a very large MySQL/Percona cluster hosted in AWS (EU Region). Increasingly, enterprise clients, especially in the US, require strict data residency (eg, all data … monolithic application modernisation initiative. Build and maintain programme roadmaps, resource plans, risk registers, RAID logs, and budget oversight. Shape delivery methodology (Agile, hybrid, or phased transformation) suitable for a Legacy-heavy environment. Technical Transformation Oversight Understand at a high level how monolithic systems work, the risks of refactoring them, and the paths to migrate toward modular architectures. Collaborate with … engineering, data, and product teams to define migration strategies, such as: Strangulation pattern/incremental extraction of services Database sharding or regional replication Re-platforming or refactoring Legacy MySQL/Percona setups Ensure the programme aligns with AWS best practices for multi-region deployments and data handling. Data Residency & Compliance Delivery Work with legal, compliance, and data teams to More ❯
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Senior Project Manager

London Area, United Kingdom
Robson Bale
Data Sovereignty Programme 6 month initial contract but likely to extend Market rate: Outside IR35 About the Role Our client has a 17-year-old monolithic application with significant Legacy complexity and a very large MySQL/Percona cluster hosted in AWS (EU Region). Increasingly, enterprise clients, especially in the US, require strict data residency (eg, all data … monolithic application modernisation initiative. Build and maintain programme roadmaps, resource plans, risk registers, RAID logs, and budget oversight. Shape delivery methodology (Agile, hybrid, or phased transformation) suitable for a Legacy-heavy environment. Technical Transformation Oversight Understand at a high level how monolithic systems work, the risks of refactoring them, and the paths to migrate toward modular architectures. Collaborate with … engineering, data, and product teams to define migration strategies, such as: Strangulation pattern/incremental extraction of services Database sharding or regional replication Re-platforming or refactoring Legacy MySQL/Percona setups Ensure the programme aligns with AWS best practices for multi-region deployments and data handling. Data Residency & Compliance Delivery Work with legal, compliance, and data teams to More ❯
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Principal Software Engineer (Full Stack) - React, Typescript, C#, .NET Core, MySQL, AWS Services (serverless)

London Area, United Kingdom
Smart Sourcer
Functions, S3, IAM) to deliver secure, event-driven systems. Embed testing-first practices (TDD/BDD, contract tests, Jest/RTL, Playwright/Cypress, xUnit/NUnit) to raise code quality. Implement modern CI/CD (GitHub Actions) and Infrastructure as Code (Terraform, CloudFormation, AWS CDK). Model secure-by-design principles; ensure robust authentication/authorisation (OAuth2 … Mentor engineers, set patterns, run PoCs, and unblock complex problems across squads. Champion “Always ship each cycle”; partner with Product to balance scope, delivery, and quality. Drive modernisation: sunset legacy code, reduce tech debt, and improve performance, reliability, and observability. Who We’re Looking For: Highly experienced full stack engineer with strong proficiency in C# .NET Core and More ❯
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Principal Software Engineer (Full Stack) - React, Typescript, C#, .NET Core, MySQL, AWS Services (serverless)

City of London, London, United Kingdom
Smart Sourcer
Functions, S3, IAM) to deliver secure, event-driven systems. Embed testing-first practices (TDD/BDD, contract tests, Jest/RTL, Playwright/Cypress, xUnit/NUnit) to raise code quality. Implement modern CI/CD (GitHub Actions) and Infrastructure as Code (Terraform, CloudFormation, AWS CDK). Model secure-by-design principles; ensure robust authentication/authorisation (OAuth2 … Mentor engineers, set patterns, run PoCs, and unblock complex problems across squads. Champion “Always ship each cycle”; partner with Product to balance scope, delivery, and quality. Drive modernisation: sunset legacy code, reduce tech debt, and improve performance, reliability, and observability. Who We’re Looking For: Highly experienced full stack engineer with strong proficiency in C# .NET Core and More ❯
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Principal Full Stack Engineer React, Typescript, C#, MySQL, AWS

City of London, London, United Kingdom
Smart Sourcer Limited
Functions, S3, IAM) to deliver secure, event-driven systems. Embed testing-first practices (TDD/BDD, contract tests, Jest/RTL, Playwright/Cypress, xUnit/NUnit) to raise code quality. Implement modern CI/CD (GitHub Actions) and Infrastructure as Code (Terraform, CloudFormation, AWS CDK). Model secure-by-design principles; ensure robust authentication/authorisation (OAuth2 … Mentor engineers, set patterns, run PoCs, and unblock complex problems across squads. Champion Always ship each cycle; partner with Product to balance scope, delivery, and quality. Drive modernisation: sunset legacy code, reduce tech debt, and improve performance, reliability, and observability. Who Were Looking For: Highly experienced full stack engineer with strong proficiency in C# .NET Core and/ More ❯
Employment Type: Permanent
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Senior Software Engineer

City of London, London, United Kingdom
bloom
minded and love solving messy, complex problems You thrive in small teams where ideas move from whiteboard → production in hours You want to build something meaningful, not just maintain legacy code, with a love for building 0-1 products. 📍 London (4 days a week building together onsite) 💰 Up to £130,000 + meaningful early-stage equity % If you More ❯
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Senior Software Engineer

London Area, United Kingdom
bloom
minded and love solving messy, complex problems You thrive in small teams where ideas move from whiteboard → production in hours You want to build something meaningful, not just maintain legacy code, with a love for building 0-1 products. 📍 London (4 days a week building together onsite) 💰 Up to £130,000 + meaningful early-stage equity % If you More ❯
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Software Engineer

City of London, London, United Kingdom
LinuxRecruit
is discovered, protected, and accelerated. The team is building systems that detect infringement, streamline R&D, and empower creators to move faster. It’s a true greenfield opportunity, no legacy code, no bureaucracy, just the freedom to solve challenging technical problems with impact. The founding team comes from some of the world’s most respected technology companies and More ❯
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Software Engineer

London Area, United Kingdom
LinuxRecruit
is discovered, protected, and accelerated. The team is building systems that detect infringement, streamline R&D, and empower creators to move faster. It’s a true greenfield opportunity, no legacy code, no bureaucracy, just the freedom to solve challenging technical problems with impact. The founding team comes from some of the world’s most respected technology companies and More ❯
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🚀 C++ Engineer – World’s Largest (Almost!) Supercomputer

City of London, London, United Kingdom
Augmentti
by colleagues who are at the top of their fields, pushing the boundaries of technology and finance every day. Innovation & Impact: Work in a modern, young codebase with minimal legacy code and technical debt. You’ll have the freedom to choose the best technology for the job, allowing you to innovate and deliver at an unmatched scale. They More ❯
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🚀 C++ Engineer – World’s Largest (Almost!) Supercomputer

London Area, United Kingdom
Augmentti
by colleagues who are at the top of their fields, pushing the boundaries of technology and finance every day. Innovation & Impact: Work in a modern, young codebase with minimal legacy code and technical debt. You’ll have the freedom to choose the best technology for the job, allowing you to innovate and deliver at an unmatched scale. They More ❯
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Digital Web Manager

Bromley, London, United Kingdom
Bromcom Computers Plc
CMS governance, analytics setup (GA4, GTM), and integration with Dynamics 365 and Power BI. Own website performance, accessibility, and SEO optimisation. Oversee ongoing maintenance, updates, and documentation to avoid legacy code issues. Skills & Experience Essential Experience leading website redevelopment or CMS migration projects. Knowledge of CMS platforms such as Optimizely, Umbraco, or WordPress. Working knowledge of HTML, CSS More ❯
Employment Type: Permanent
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SAP ABAP Developer

City of London, London, United Kingdom
LJRecruitment
accelerate transformation, and finally bring clarity to complex systems. The role Take your SAP and ABAP experience into a next-generation environment where the focus isn’t on maintaining legacy code, but on building smarter ways of understanding and improving enterprise systems . You’ll collaborate with a small, ambitious team blending deep technical know-how with automation More ❯
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SAP ABAP Developer

London Area, United Kingdom
LJRecruitment
accelerate transformation, and finally bring clarity to complex systems. The role Take your SAP and ABAP experience into a next-generation environment where the focus isn’t on maintaining legacy code, but on building smarter ways of understanding and improving enterprise systems . You’ll collaborate with a small, ambitious team blending deep technical know-how with automation More ❯
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Quantitative Developer

London Area, United Kingdom
Cititec
doing: Designing, developing, and maintaining pricing libraries for commodity products Building and supporting risk management tools and analytics platforms Taking models from prototype to production - writing robust, scalable Python code Collaborating with quantitative analysts to implement models and frameworks Interacting with some legacy codebases, ideally in another OOP language (C C#/Java) What they’re looking for … Solid professional experience as a Quant Developer (or software developer with mathematical background) Strong programming skills in Python, with the ability to write production-grade code Experience with at least one other OOP language (C++, C#, or Java) Background in commodities trading, risk, or pricing Familiarity with numerical libraries, performance optimisation, and clean software design principles Confident working closely More ❯
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Quantitative Developer

City of London, London, United Kingdom
Cititec
doing: Designing, developing, and maintaining pricing libraries for commodity products Building and supporting risk management tools and analytics platforms Taking models from prototype to production - writing robust, scalable Python code Collaborating with quantitative analysts to implement models and frameworks Interacting with some legacy codebases, ideally in another OOP language (C C#/Java) What they’re looking for … Solid professional experience as a Quant Developer (or software developer with mathematical background) Strong programming skills in Python, with the ability to write production-grade code Experience with at least one other OOP language (C++, C#, or Java) Background in commodities trading, risk, or pricing Familiarity with numerical libraries, performance optimisation, and clean software design principles Confident working closely More ❯
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Software Engineer (Remote/Hybrid)

West London, UK
Hybrid/Remote Options
Secure Screening Services
heights. · High Levels of Collaboration: Engage in high levels of collaboration with a team that values teamwork, open communication, and collective problem-solving. Duties & Responsibilities · Deliver stable, well-reviewed code across our PHP 8/Laravel 9 monolith · Improve legacy systems incrementally without introducing risk or churn · Follow technical leadership and prioritize team goals over personal agendas · Mentor … engineering environment Skills & Qualifications · 5+ years of professional experience with PHP/Laravel in production · Strong familiarity with Laravel conventions and the broader ecosystem · Proven ability to work within legacy codebases · Competence with React — no rebuilds, but capable of debugging and stabilizing · Experience with DevOps basics: AWS, CI/CD, shell tools, etc. · High attention to detail and careful More ❯
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Software Engineer (Remote/Hybrid)

Central London, UK
Hybrid/Remote Options
Secure Screening Services
heights. · High Levels of Collaboration: Engage in high levels of collaboration with a team that values teamwork, open communication, and collective problem-solving. Duties & Responsibilities · Deliver stable, well-reviewed code across our PHP 8/Laravel 9 monolith · Improve legacy systems incrementally without introducing risk or churn · Follow technical leadership and prioritize team goals over personal agendas · Mentor … engineering environment Skills & Qualifications · 5+ years of professional experience with PHP/Laravel in production · Strong familiarity with Laravel conventions and the broader ecosystem · Proven ability to work within legacy codebases · Competence with React — no rebuilds, but capable of debugging and stabilizing · Experience with DevOps basics: AWS, CI/CD, shell tools, etc. · High attention to detail and careful More ❯
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Software Engineer (Remote/Hybrid)

East London, London, United Kingdom
Hybrid/Remote Options
Secure Screening Services
heights. · High Levels of Collaboration: Engage in high levels of collaboration with a team that values teamwork, open communication, and collective problem-solving. Duties & Responsibilities · Deliver stable, well-reviewed code across our PHP 8/Laravel 9 monolith · Improve legacy systems incrementally without introducing risk or churn · Follow technical leadership and prioritize team goals over personal agendas · Mentor … engineering environment Skills & Qualifications · 5+ years of professional experience with PHP/Laravel in production · Strong familiarity with Laravel conventions and the broader ecosystem · Proven ability to work within legacy codebases · Competence with React — no rebuilds, but capable of debugging and stabilizing · Experience with DevOps basics: AWS, CI/CD, shell tools, etc. · High attention to detail and careful More ❯
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Software Engineer (Remote/Hybrid)

City of London, London, United Kingdom
Hybrid/Remote Options
Secure Screening Services
heights. · High Levels of Collaboration: Engage in high levels of collaboration with a team that values teamwork, open communication, and collective problem-solving. Duties & Responsibilities · Deliver stable, well-reviewed code across our PHP 8/Laravel 9 monolith · Improve legacy systems incrementally without introducing risk or churn · Follow technical leadership and prioritize team goals over personal agendas · Mentor … engineering environment Skills & Qualifications · 5+ years of professional experience with PHP/Laravel in production · Strong familiarity with Laravel conventions and the broader ecosystem · Proven ability to work within legacy codebases · Competence with React — no rebuilds, but capable of debugging and stabilizing · Experience with DevOps basics: AWS, CI/CD, shell tools, etc. · High attention to detail and careful More ❯
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Software Engineer (Remote/Hybrid)

Central London / West End, London, United Kingdom
Hybrid/Remote Options
Secure Screening Services
heights. · High Levels of Collaboration: Engage in high levels of collaboration with a team that values teamwork, open communication, and collective problem-solving. Duties & Responsibilities · Deliver stable, well-reviewed code across our PHP 8/Laravel 9 monolith · Improve legacy systems incrementally without introducing risk or churn · Follow technical leadership and prioritize team goals over personal agendas · Mentor … engineering environment Skills & Qualifications · 5+ years of professional experience with PHP/Laravel in production · Strong familiarity with Laravel conventions and the broader ecosystem · Proven ability to work within legacy codebases · Competence with React — no rebuilds, but capable of debugging and stabilizing · Experience with DevOps basics: AWS, CI/CD, shell tools, etc. · High attention to detail and careful More ❯
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Legacy Code
London
10th Percentile
£75,425
25th Percentile
£85,000
Median
£100,000
75th Percentile
£115,000
90th Percentile
£125,000