20 of 20 Contract Legacy Systems Jobs in London

Solutions Architect

Hiring Organisation
Trust In Soda
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£700 - £748 per day
Ideally S-100 but S-57 at a minimum. Cloud & Legacy Migration Successfully contributed to the migration of critical legacy systems to cloud-based infrastructure. Working knowledge of a major cloud provider (e.g., AWS, Azure, or GCP) and familiarity with Infrastructure as Code (IaC) tools … like Terraform or CloudFormation. Experience working on large, complex codebases and legacy systems. Nice to have skills. Knowledge of S-101 (ENC) and other S-100 product specifications Experience with chart compilation tools or GIS platforms used for hydrographic data processing. Experience with Azure DevOps and CI/ ...

Full Stack Developer

Hiring Organisation
Hays Specialist Recruitment Limited
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
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 ...

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 ...

Postgres Data Architect

Hiring Organisation
Stackstudio Digital Ltd
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
From £500 to £550 per day
experience in Change Data Capture (CDC). The candidate will design and implement robust data migration strategies, ensuring seamless integration between legacy systems and modern cloud-based architectures. Responsibilities Architect CDC Pipelines: Design and optimize Change Data Capture workflows (IBM CDC or equivalent), including subscription design, bookmarks ...

Salesforce/ CRM Business Analyst

Hiring Organisation
Lorien
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
Salary negotiable
will work within a delivery squad, collaborating closely with stakeholders, product owners, and technical teams to enable seamless migration from legacy systems and drive adoption of Salesforce across the organisation. Key Responsibilities: Engage with business stakeholders to gather, validate, and prioritise requirements. Analyse existing processes and identify ...

Back End Integration Engineer

Hiring Organisation
VIQU IT Recruitment
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£400 - 500 per day + Inside IR35
digital transformation. Working as part of the Digital Solutions team, you will design, build and maintain APIs, services and integration patterns that connect systems across the business. Back End Integration Engineer's Key Responsibilities Design and implement integrations between internal systems, cloud services and third-party vendor platforms. … work effectively across technical and business teams. Good understanding of data flows, data modelling and system interoperability. Experience integrating with legacy systems and/or third-party vendor platforms. Role Overview: Position : Back End Integration Engineer Type : Contract Location : London – Hybrid – 2/3 days per week ...

Back End Integration Engineer

Hiring Organisation
VIQU IT
Location
London, Broad Street, United Kingdom
Employment Type
Contract
Contract Rate
£400 - £500/day Inside IR35
digital transformation. Working as part of the Digital Solutions team, you will design, build and maintain APIs, services and integration patterns that connect systems across the business. Back End Integration Engineer’s Key Responsibilities Design and implement integrations between internal systems, cloud services and third-party vendor platforms. … work effectively across technical and business teams. Good understanding of data flows, data modelling and system interoperability. Experience integrating with legacy systems and/or third-party vendor platforms. Role Overview: Position : Back End Integration Engineer Type : Contract Location : London – Hybrid – 2/3 days per week ...

Back End Integration Engineer

Hiring Organisation
VIQU IT Recruitment
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£400 - £500 per day
digital transformation. Working as part of the Digital Solutions team, you will design, build and maintain APIs, services and integration patterns that connect systems across the business. Back End Integration Engineer’s Key Responsibilities Design and implement integrations between internal systems, cloud services and third-party vendor platforms. … work effectively across technical and business teams. Good understanding of data flows, data modelling and system interoperability. Experience integrating with legacy systems and/or third-party vendor platforms. Role Overview: Position : Back End Integration Engineer Type : Contract Location : London – Hybrid – 2/3 days per week ...

L3 Data Engineer - Support

Hiring Organisation
Stackstudio Digital Ltd
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
From £250 to £270 per day
business teams, and network teams for data requirements. Implement best practices for data governance, security, and cost management. Support migrations from legacy systems to AWS-native data lakes or Redshift. Ideal Candidate Profile 310+ years of experience in AWS Data Engineering/Support Engineering. Strong telecom domain ...

Oracle Fusion Cloud Senior Data Migration Manager

Hiring Organisation
GTC Recruitment Limited
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£650 - £700 per day
migration phases Interface with Oracle Fusion data models and manage FBDI, HDL, and BICC artefacts Coordinate migration activities across multiple legacy source systems Provide leadership and guidance to technical and functional teams Identify, manage, and mitigate risks related to data quality, security, and cutover readiness Minimum Requirements … projects for Oracle Fusion Cloud Financial Management, HCM, and EPM Experience working in complex legacy environments with both Oracle and non-Oracle systems Proven experience with Oracle Master Data Management products Strong understanding of data management methodologies Excellent problem-solving, analytical, communication, and leadership skills Ability ...

Business Analyst - Process Mapping, Healthcare, TOM

Hiring Organisation
Hays Technology
Location
London, United Kingdom
Employment Type
Contract
Excellent communication skills Exceptional Stakeholder Management skills Flexible approach towards onsite working (minimum 3 days per week) Nice to have: Working knowledge of CRM systems and ability to refine requirements (ie MS Dynamics) Experience of working on Programmes relating to legacy systems, mapping out what ...

Business Analyst - Process Mapping, Healthcare, TOM

Hiring Organisation
Hays Specialist Recruitment Limited
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
Salary negotiable
Excellent communication skills Exceptional Stakeholder Management skills Flexible approach towards onsite working (minimum 3 days per week) Nice to have: Working knowledge of CRM systems and ability to refine requirements (ie MS Dynamics) Experience of working on Programmes relating to legacy systems, mapping out what ...

Senior Developer

Hiring Organisation
Tenth Revolution Group
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£400 per day
work within a collaborative, multidisciplinary environment to design, build, and maintain high-quality digital services. The role involves contributing to both new and existing systems, supporting multiple languages and platforms, and applying strong DevOps, TDD, and modern engineering practice throughout. Key Responsibilities Develop new services using Python while supporting … existing components written in Java and .NET Work with Oracle PL/SQL to support legacy and operational systems Engineer solutions across cloud and infrastructure environments including AWS, Azure, Linux, SQL Server, Postgres, Docker, and Kubernetes Implement CI/CD pipelines using GitHub or Azure DevOps Deliver ...

Senior Developer

Hiring Organisation
Tenth Revolution Group
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£400/day
work within a collaborative, multidisciplinary environment to design, build, and maintain high-quality digital services. The role involves contributing to both new and existing systems, supporting multiple languages and platforms, and applying strong DevOps, TDD, and modern engineering practice throughout. Key Responsibilities Develop new services using Python while supporting … existing components written in Java and .NET Work with Oracle PL/SQL to support legacy and operational systems Engineer solutions across cloud and infrastructure environments including AWS, Azure, Linux, SQL Server, Postgres, Docker, and Kubernetes Implement CI/CD pipelines using GitHub or Azure DevOps Deliver ...

Software Conversion Project Manager - UK Life Tax

Hiring Organisation
Randstad Technologies Recruitment
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£600 - £850/day
lead a major tax software migration within its UK Life Tax division. Key Responsibilities Lead the end-to-end migration from a legacy tax system to a new third-party platform. Manage planning, timelines, risks, and stakeholder updates. Oversee data configuration, data take-on, and system testing ...

Postgres Data Architect

Hiring Organisation
Stackstudio Digital Ltd
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP 500 - 550 Daily
experience in Change Data Capture (CDC). The candidate will design and implement robust data migration strategies, ensuring seamless integration between legacy systems and modern cloud-based archit click apply for full job details ...

Senior Data Migration Manager (Oracle Fusion Cloud)

Hiring Organisation
Circle Group
Location
London, United Kingdom
Employment Type
Contract, Work From Home
Contract Rate
£600 - £700 per day
experience in leading data migration projects for Oracle Fusion Cloud Financial Management , HCM and EPM within a complex legacy environment of source systems, which include Oracle and non-Oracle point systems Proven experience of Oracle master data management products Solid understanding of Fusion data models ...

Senior Data Migration Manager Oracle Fusion Cloud

Hiring Organisation
Circle Recruitment
Location
London, South East, England, United Kingdom
Employment Type
Contractor
Contract Rate
£600 - £700 per day
experience in leading data migration projects for Oracle Fusion Cloud Financial Management , HCM and EPM within a complex legacy environment of source systems, which include Oracle and non-Oracle point systems Proven experience of Oracle master data management products Solid understanding of Fusion data models ...

AI Automation Engineer

Hiring Organisation
McCabe & Barton
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
Up to £700 per day
data modelling. Skilled in building end-to-end business process applications, configuring workflows, implementing business rules, managing records, and integrating Appian with external systems via REST APIs, web services, and connected systems. API Development & Integration - Proficient in designing and building RESTful APIs using FastAPI, Flask, or Django REST Framework … models and automation services. Experience with API authentication (OAuth, JWT), rate limiting, error handling, API documentation (Swagger/OpenAPI), webhooks, and integrating disparate systems to create seamless automated workflows. Document Processing & OCR - Experience implementing intelligent document processing solutions using OCR technologies (Tesseract, Azure AI Document Intelligence, natural language processing ...

Solution Architect - (HCM) SC Cleared

Hiring Organisation
Henderson Scott
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£700 - £800 per day + Umbrella rate (inside IR35)
This role is critical for technical readiness, involving the design of integration patterns that will connect the new HCM with crucial internal and external systems across HR, Finance, and Payroll. The Role: End-to-End Integration Strategy & Delivery You will report directly to the Senior Technical Delivery Manager, acting … PECI, and APIs. Middleware Expertise: Leverage experience with middleware platforms (e.g., MuleSoft, Boomi, Azure Integration Services) to connect Workday to third-party and legacy systems. Delivery Management: Oversee the build, testing, and secure deployment of multiple integrations in parallel, collaborating closely with IT and external vendors. Compliance: Produce ...