26 to 50 of 189 Legacy Systems Jobs in London

Full Stack Developer - Python, Java or .Net

Hiring Organisation
Hays Specialist Recruitment Limited
Location
London, South East, England, United Kingdom
Employment Type
Full-Time
Salary
Salary negotiable
scalable services using Python as the primary backend language, while supporting existing services built in Java and .NET. Maintain and enhance legacy systems using Oracle SQL PL. Implement Test-Driven Development (TDD) practices, ensuring automated tests are written prior to code development. Work with complex data challenges ...

Azure Solution Architect

Hiring Organisation
Tata Consultancy Services
Location
City of London, London, United Kingdom
ecosystem. Your responsibilities: Architect and implement solutions using Azure services for data ingestion, transformation, storage, and analytics Develop modernization roadmaps for legacy systems to Azure Data Platform Design data governance and security frameworks ensuring compliance with organizational and regulatory standards Collaborate with stakeholders to define functional ...

Azure Solution Architect

Hiring Organisation
Tata Consultancy Services
Location
London Area, United Kingdom
ecosystem. Your responsibilities: Architect and implement solutions using Azure services for data ingestion, transformation, storage, and analytics Develop modernization roadmaps for legacy systems to Azure Data Platform Design data governance and security frameworks ensuring compliance with organizational and regulatory standards Collaborate with stakeholders to define functional ...

Data Analyst - Must hold active SC Clearance

Hiring Organisation
Amber Labs
Location
London, UK
Employment Type
Full-time
staff. We are seeking an SC Cleared Data Analyst to join our growing team and play a key role in modernising legacy systems and enabling data-driven transformation. What you'll do: Analyse existing legacy data structures, schemas, and relationships to understand current state. Document … data lineage, tracing where data originates and how it flows through systems. Create mapping documents between legacy data fields and new system fields to support migration. Define and implement strategies for data migration, ensuring accuracy and efficiency. Identify obsolete or redundant data that can be archived or removed. ...

Enterprise Architect

Hiring Organisation
CitNOW Group
Location
South London, UK
Employment Type
Full-time
platforms, applications and data landscapes. We are seeking an experienced Enterprise Architect to define and implement a group-wide architecture strategy that unifies these systems within a cohesive, scalable and future-ready environment, enabling us to accelerate innovation in a secure and scalable manner. We're seeking strong expertise … Develop and maintain a unified enterprise architecture framework that spans all acquired businesses Define standards and blueprints for integration, data architecture, and core enterprise systems Integration & Consolidation Lead the design of integration strategies to connect disparate platforms, applications, and processes across the group and with external third-parties Oversee ...

Oracle DBA - SC Cleared

Hiring Organisation
JLA Resourcing Ltd
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£500 per day
support a major, multi-year MOD information and knowledge management programme. The programme is focused on migrating several disparate legacy systems onto a MOD-hosted enterprise Product Lifecycle Management (PLM) solution and has already delivered an initial MVP. You will be embedded client-side within ...

Oracle APEX Consultant

Hiring Organisation
Frontier Resourcing
Location
London, UK
Employment Type
Full-time
integration layers (OIC) to curate clean, well-modelled datasets. Contribute to data migration activities, ensuring accuracy, integrity and auditability throughout transitions from legacy systems. Apply security-by-design, access controls and logging appropriate for regulated MOD environments. Operate in Agile delivery squads with APEX devs, data engineers, integration ...

Oracle APEX Consultant

Hiring Organisation
Frontier Resourcing
Location
South London, UK
Employment Type
Full-time
integration layers (OIC) to curate clean, well-modelled datasets. Contribute to data migration activities, ensuring accuracy, integrity and auditability throughout transitions from legacy systems. Apply security-by-design, access controls and logging appropriate for regulated MOD environments. Operate in Agile delivery squads with APEX devs, data engineers, integration ...

Enterprise Security Architect

Hiring Organisation
The Associates Global
Location
City of London, London, United Kingdom
definition and implementation of enterprise-wide security architecture. You’ll be responsible for designing strategies and frameworks that secure critical systems and services, spanning both on-premise and cloud environments. You’ll also play a hands-on leadership role in mentoring solution and technical architects, ensuring security … security-focused architecture patterns Design and maintain conceptual and logical security architectures across multiple technology domains Support secure delivery of cloud and on-premise systems (Oracle, Microsoft, Salesforce, MuleSoft) Guide solution and technical architects on security principles, best practices, and assurance Contribute to architecture governance, standards, and documentation Partner ...

Enterprise Security Architect

Hiring Organisation
The Associates Global
Location
London Area, United Kingdom
definition and implementation of enterprise-wide security architecture. You’ll be responsible for designing strategies and frameworks that secure critical systems and services, spanning both on-premise and cloud environments. You’ll also play a hands-on leadership role in mentoring solution and technical architects, ensuring security … security-focused architecture patterns Design and maintain conceptual and logical security architectures across multiple technology domains Support secure delivery of cloud and on-premise systems (Oracle, Microsoft, Salesforce, MuleSoft) Guide solution and technical architects on security principles, best practices, and assurance Contribute to architecture governance, standards, and documentation Partner ...

Senior Project Manager

Hiring Organisation
Reed
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£500 - £525 per day, Inc benefits
team on a key technology project. This role involves significant stakeholder engagement and the coordination of multiple project streams to replace legacy systems and streamline processes. Day-to-day of the role: Lead the delivery of the project which involves replacing legacy indoor workload tools ...

Lead AI Engineer

Hiring Organisation
Euphoric
Location
City of London, London, United Kingdom
trillion on benefits every year. It’s their second-largest cost after payroll — yet the entire category is still running on legacy systems and outdated assumptions. The space is primed for transformation: despite its scale, it’s been almost completely overlooked by AI-first startups. Incumbents — including … resident expert. You won't just be tuning hyperparameters in a notebook; you will be a core software engineer architecting the complex systems that make AI useful in production. In the immediate future, your time will be split between crafting complex AI processing architectures (40%) and hands-on data ...

Lead AI Engineer

Hiring Organisation
Euphoric
Location
London Area, United Kingdom
trillion on benefits every year. It’s their second-largest cost after payroll — yet the entire category is still running on legacy systems and outdated assumptions. The space is primed for transformation: despite its scale, it’s been almost completely overlooked by AI-first startups. Incumbents — including … resident expert. You won't just be tuning hyperparameters in a notebook; you will be a core software engineer architecting the complex systems that make AI useful in production. In the immediate future, your time will be split between crafting complex AI processing architectures (40%) and hands-on data ...

Senior Data Engineer | Up to £90k + Equity | VC Backed Start Up

Hiring Organisation
Opus Recruitment Solutions
Location
City of London, London, United Kingdom
Senior Data Engineer to help them scale fast. You’ll own critical data engineering projects, including a major migration from legacy systems to modern cloud platforms, and build the pipelines that power machine learning and real-time decision-making. What You’ll Do Design and optimize … work truly matters 💡 If you’re a Senior Data Engineer who wants to make a difference , thrive in a startup environment , and work on systems that matter , let’s talk. Drop me a message or email: kumbirai.mafini@opusrs.com ...

Senior Data Engineer | Up to £90k + Equity | VC Backed Start Up

Hiring Organisation
Opus Recruitment Solutions
Location
London Area, United Kingdom
Senior Data Engineer to help them scale fast. You’ll own critical data engineering projects, including a major migration from legacy systems to modern cloud platforms, and build the pipelines that power machine learning and real-time decision-making. What You’ll Do Design and optimize … work truly matters 💡 If you’re a Senior Data Engineer who wants to make a difference , thrive in a startup environment , and work on systems that matter , let’s talk. Drop me a message or email: kumbirai.mafini@opusrs.com ...

CRM Solution Architect

Hiring Organisation
Harnham - Data & Analytics Recruitment
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£600 - £650 per day
Microsoft Dynamics, Bloomreach and Hightouch. Key Responsibilities: Define and lead the solution design and architecture for CRM, Customer Data Platform (CDP), and marketing technology systems Manage and ensure smooth data migration from legacy systems Collaborate with external implementation partners and internal stakeholders including Sales, Service, Membership ...

Access Database Migration Engineer SQL & SharePoint

Hiring Organisation
Salt Search
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£450 per day
critical assignment for a Database Migration Engineer. This role sits within their Technology and Digital Services function and will lead the conversion of legacy Microsoft Access databases into modern data platforms built on SQL Server and SharePoint. You will take ownership of end-to-end migration activity, working … processes, or wider Microsoft data/Power Platform tooling This assignment forms part of a wider modernisation programme aimed at replacing legacy systems with secure, maintainable environments. You will be joining at a critical point, with scope to directly influence the success and pace of delivery. ...

Lead Infrastructure Engineer

Hiring Organisation
Quant Capital
Location
City of London, London, United Kingdom
strategy, delivery, and scale across low-latency trading systems. This hire will drive a major AWS migration, build greenfield environments, modernise legacy systems, and shape the long-term engineering roadmap. You’ll lead a small but senior infrastructure function with real autonomy and impact. The Role … architecture and hybrid (cloud + on-prem) experience Deep networking background: routing, switching, low-latency connectivity Strong understanding of reliability engineering and autoscaling systems Prior experience building and scaling teams in high-performing environments Confident interacting with technical and trading leadership Core Skills AWS (VPC, IAM, S3, ECS/ ...

Lead Infrastructure Engineer

Hiring Organisation
Quant Capital
Location
London Area, United Kingdom
strategy, delivery, and scale across low-latency trading systems. This hire will drive a major AWS migration, build greenfield environments, modernise legacy systems, and shape the long-term engineering roadmap. You’ll lead a small but senior infrastructure function with real autonomy and impact. The Role … architecture and hybrid (cloud + on-prem) experience Deep networking background: routing, switching, low-latency connectivity Strong understanding of reliability engineering and autoscaling systems Prior experience building and scaling teams in high-performing environments Confident interacting with technical and trading leadership Core Skills AWS (VPC, IAM, S3, ECS/ ...

Devops Engineer

Hiring Organisation
Pioneer Search Ltd
Location
City, London, United Kingdom
Employment Type
Permanent
Salary
GBP 60,000 - 70,000 Annual
improvement. You'll be part of a wider team but will be taking full responsibility for your environment. The Role You'll support Legacy and modern application infrastructure, working with .NET and SQL-based systems. You'll manage deployments, troubleshoot issues, and drive improvements to efficiency and reliability. …/CD pipelines across development, testing, and production environments Deploy and support .NET applications, SQL Server databases, and SSIS packages Troubleshoot Legacy systems and identify opportunities for modernisation Collaborate with remote teams while managing all local DevOps responsibilities Support Scripting and automation efforts using tools such ...

Backend Software Engineer C++ Rust Low Latency

Hiring Organisation
Client Server
Location
London, England, United Kingdom
Backend Software Engineer you will design and develop high throughput backend services for microsecond real-time risk, pricing, trading engines and market making systems, working across the full software development lifecycle using Rust (and some C++ for legacy systems). You'll collaborate with a small … talented team, problem solving and working on complex and challenging systems with interesting work. Location/WFH: You'll join the team in Central London with flexibility to work from home 1-2 days a week. About you: You have strong backend OOP, multithreaded software engineering experience with C++ ...

Backend Software Engineer C++ Rust Low Latency

Hiring Organisation
Client Server
Location
West London, London, United Kingdom
Employment Type
Permanent, Work From Home
Backend Software Engineer you will design and develop high throughput backend services for microsecond real-time risk, pricing, trading engines and market making systems, working across the full software development lifecycle using Rust (and some C++ for legacy systems). You'll collaborate with a small … talented team, problem solving and working on complex and challenging systems with interesting work. Location/WFH: You'll join the team in Central London with flexibility to work from home 1-2 days a week. About you: You have strong backend OOP, multithreaded software engineering experience with C++ ...

Senior Platform Engineer - Hedge Fund

Hiring Organisation
Orbis Group
Location
London Area, United Kingdom
data centres and cloud environments. Key focus areas include: Leading the migration from Nomad to Kubernetes across a hybrid infrastructure environment Designing highly available systems that support real-time trading operations Expanding the firm's cloud footprint (AWS/Azure/GCP) while maintaining on-prem capabilities Owning projects … from design through production What you'll need: Production experience with Kubernetes (EKS/AKS/GKE or bare-metal) Strong Linux systems background; Windows experience is beneficial Track record delivering cloud migrations and managing hybrid environments Experience supporting mission-critical, highly available systems What makes this different ...

Senior Platform Engineer - Hedge Fund

Hiring Organisation
Orbis Group
Location
City of London, London, United Kingdom
data centres and cloud environments. Key focus areas include: Leading the migration from Nomad to Kubernetes across a hybrid infrastructure environment Designing highly available systems that support real-time trading operations Expanding the firm's cloud footprint (AWS/Azure/GCP) while maintaining on-prem capabilities Owning projects … from design through production What you'll need: Production experience with Kubernetes (EKS/AKS/GKE or bare-metal) Strong Linux systems background; Windows experience is beneficial Track record delivering cloud migrations and managing hybrid environments Experience supporting mission-critical, highly available systems What makes this different ...

Senior Python Developer – Multi-Billion Dollar Hedge Fund - Mortgage Technology - London - Hybrid – Up to £300k TC

Hiring Organisation
Mondrian Alpha
Location
City of London, London, United Kingdom
daily by investment, risk, finance, and operations. You will play a pivotal role as the firm continues its migration away from legacy systems and enhances its bespoke internal platforms. The Role As a Business Engineering Developer, you will: Build, enhance, and maintain applications supporting mortgage origination, valuation … problem-solving Significant influence across the organisation You will join at a time of major investment in technology, with clear opportunities to contribute to systems that will define the firm’s next decade. What We’re Looking For Strong Python skills (pandas, NumPy, SQLAlchemy, etc.) Experience working in business ...