25 of 25 Legacy Systems Jobs in London

Title: Systems Engineer Location: Remote + Quarterly Planning Sessions in Bristol Remuneration: £600 per day via Umbrella Company Contract Details: Temporary - 6 Months (Scope for Extensions) Responsibilities: Our client is seeking a talented Systems Engineer to play a pivotal role in a transformative modernisation programme. The organisation … replacing ageing on-premises systems with a cutting-edge cloud-native architecture within a greenfield AWS environment. This is an exciting opportunity to contribute to significant advancements in technology and operational excellence. Key responsibilities include: Analysing and understanding existing legacy systems and infrastructure. Collaborating with stakeholders ...

long-term maintainability Guide API and domain design standards - clear service boundaries, consistent contracts, and pragmatic integration between modern services and legacy systems Shape event-driven and integration patterns so teams can build independently without breaking cross-squad journeys Champion automated testing, observability, and production readiness … Oversee database and schema evolution practices - migrations, data integrity, and performance - in partnership with platform and infrastructure teams Lead incident response for backend-owned systems - triage, escalation, post-incident reviews, and runbook quality Mentor engineers on PHP (Yii/Yii2), Go, Security, Performance and Optimisation - raising the bar through ...

company that's building a suite of next-generation AI products from the ground up. This isn't a role focused on maintaining legacy systems. You'll be part of a small, highly experienced engineering team responsible for transforming ambitious ideas into production-ready software. Working closely with ...

trends, anomalies and gaps Define and document KPIs, metrics, business definitions, calculation logic, rules, assumptions and data requirements Investigate discrepancies between Legacy systems, datasets and reports, working with technical teams to identify root causes and agree remediation Translate business and analytical needs into clear requirements, user stories ...

join a strategic application modernisation programme. This role sits within a technology team responsible for evolving critical business applications, supporting a transition from legacy desktop solutions to modern web-based and cloud-enabled platforms. The successful candidate will work across the full software development lifecycle, contributing … Ability to work independently in a fast-paced environment Collaborative mindset and willingness to mentor junior developers Comfortable balancing support of legacy systems alongside modernisation initiatives GCS is acting as an Employment Business in relation to this vacancy. ...

high-quality, well-structured datasets. Contribute to data migration and transformation activities, ensuring data accuracy, integrity, traceability and auditability throughout the transition from legacy systems. Apply security-by-design principles, including appropriate access controls, governance and logging, in line with the requirements of regulated MOD environments. Work within ...

Public Sector organisation are seeking a HR Systems Analyst to provide technical analysis and business analysis skills on a HR Systems implementation programme. The HR System Analyst will play a key role in supporting the design, configuration and implementation of new Oracle Cloud HCM platform as part … wider transformation programme. This role will provide specialist technical expertise to help replace the current HR systems landscape with an integrated, secure and scalable Oracle-based solution to further improve the employee, manager and HR experience. Working closely with HR, IT, Finance, project resources and 3rd party specialists ...

Grafana). Much of our estate is Java 21 and Spring Boot, but we care more about how you design, reason about and operate systems than about which language you write them in. We embrace modern AI coding tools in our daily workflow. With AI writing more … also help decide what should be shared across markets and what needs to be configured per market. · Accelerating IT transformation. Replace legacy systems and manual processes with modern, reliable services. That gets new commercial products to market faster, protects revenue from outages, cuts the cost ...

assessment, and continuous improvement of technology-related controls. This role requires experience in testing controls in a cloud-native environment as opposed to legacy IT systems. Your Mission: Perform control testing (Design & Operating Effectiveness) for Access Management, Change Management, and IT application controls across our cloud infrastructure ...

Undertaking detailed data analysis, cleansing and validation. Managing data quality and ensuring financial data integrity throughout the migration. Performing detailed financial reconciliations between legacy and new systems. Supporting data migration testing, validation and UAT. Investigating discrepancies, identifying data issues and driving resolutions. Working closely with Finance ...

organisation manages supporters, fundraising and programmes. You'll own the solution architecture, guide the migration from legacy systems, and work closely with stakeholders and delivery partners to build a scalable, well-integrated platform. Proven experience as a Salesforce Solution Architect on nonprofit implementations Hands-on expertise with … Nonprofit Cloud Strong understanding of fundraising processes Experience leading data migration from legacy or third-party CRMs Track record of designing integrations with finance, payment and marketing platforms This is a 6-month contract, Outside IR35 working fully remote. If you are available and match the criteria above ...

with Dynamics 365 Business Central at the heart of its growth. They help ambitious small and mid sized businesses move off legacy systems such as NAV, Sage and QuickBooks onto modern cloud ERP. They combine strong delivery credentials with a people first culture, and are investing heavily ...

achieved within Workday Financials. - Translate business requirements into scalable and sustainable Workday solutions. - Provide architectural guidance for migration of processes from Legacy systems to Workday. - Collaborate with Finance, Operations, Business, and IT stakeholders to define solution strategies. - Recommend alternative approaches when standard Workday functionality does not meet ...

Microsoft Teams. About us Established in 2013, Natural Resources Wales (NRW) adopted a cloud-first strategy from the outset, free from legacy systems and large-scale migrations. Our Digital, Data and Technology (DDaT) department is structured into specialist teams that manage a multi-region Azure cloud environment … supporting critical national services, operating 24/7. Our technology estate is extensive and vital, including over 100 web applications, real-time modelling systems, public alerting tools, and IoT data from 650+ remote sites. This work supports public safety, environmental protection, and high-quality service delivery. Looking ahead ...

with Dynamics 365 Business Central at the heart of its growth. They help ambitious small and mid sized businesses move off legacy systems such as NAV, Sage and QuickBooks onto modern cloud ERP. . click apply for full job details ...

complex application and database dependencies across the payroll landscape. Coordinate system integration points with the wider enterprise estate. Lead data archiving and legacy system decommissioning. Manage third-party vendors and translate technical requirements for business stakeholders. Requirements: Strong background in Application Service Management and cross-functional IT coordination. ...

HubSpot Implementation Consultant 3 Month Contract Location: UK - Remote Rate: £450 - £500 per day (Outside IR35) Skills: HubSpot Implementation, CRM Data Migration, Systems Integration, HubSpot Configuration, Revenue Operations We are recruiting an experienced HubSpot Implementation & Integration Consultant to support a leading software company with the continued development … improvements to the current configuration and data model. Manage the migration and consolidation of customer, contract and historical data from legacy CRM systems into HubSpot. Configure HubSpot objects, properties, associations, pipelines and workflows to support business requirements. Implement and optimise the integration between HubSpot and Xero , ensuring ...

About the Role We are partnering with a premier, specialized software engineering and technical consultancy that builds mission-critical, data-intensive systems for tier-one banking and financial institutions. On their behalf, we are looking for a DevOps/Platform Engineer with a strong C#/.NET development background …/CD pipelines (TeamCity, Octopus Deploy, Jenkins, Azure DevOps). Assist with the management and gradual migration of legacy enterprise deployment systems toward modernized pipeline standards. Automate IIS server instances, deployment scripts, and deployment infrastructure in highly secure environments. Ensure maximum uptime, security compliance, and performance ...

worked on projects where a legacy e-commerce platform had been migrated to Shopify Deep understanding of eCommerce platforms including CMS systems, promotional tools and other digital experience capability Experience working with an outsource partner ensuring SLAs are met & best practice is in place Excellent stakeholder management … templates ensuring full knowledge transfer and adoption across brands Where any eCommerce Operations are handled internally ensure the team are well trained in all systems Liaise closely with the Digital Design Lead to ensure the teams remain in sync across SLAs Manage Outsource Partner Manage ...

involving Microsoft Dynamics 365 and its integration with wider enterprise platforms. Design integration across Dynamics 365, enterprise applications, data platforms, digital channels and legacy systems. Ensure solutions align with enterprise architecture principles and technology standards. End-to-End Solution Design Develop end-to-end architectures covering applications, integrations … Architect/Solution Architect on large-scale transformation programmes. Proven Microsoft Dynamics 365 architecture experience. Strong understanding of enterprise integration , including integration with legacy applications, enterprise platforms, data and digital channels. Demonstrable experience producing HLDs and Solution Options Papers . Strong knowledge of architecture governance, design reviews ...

between Finance, Projects, Enterprise Asset Management and Service & Maintenance, ensuring operational activity flows accurately into financial reporting and billing. - Leading the architecture for legacy finance system decommissioning, including data migration, opening balances, reconciliation and cutover. - Managing statutory and fiscal localisation requirements across Europe and the Americas, including … architectural decision-making. - Experience with legacy finance migrations, data reconciliation and cutover planning. - Strong stakeholder management skills, with the confidence to challenge systems integrators, senior stakeholders and local business teams. We're looking for someone who has genuinely owned the architecture of a complex international ERP programme ...

Transformation Programme . Are you ready to fix the "front door" of public services? Local council access points are notoriously fragmented, tangled across legacy phone numbers, isolated departmental processes for high-stakes services like Social Care and Homelessness, and outdated online forms. We are looking for a sharp … managing spreadsheets from the sidelines. You will own the hands-on delivery of a unified digital access strategy, integrating modern CCaaS systems, AI-driven triage, and seamless Resident Single Sign-On across Hackney's entire service ecosystem. If you want to eliminate friction for residents, streamline back-office operations ...

ensuring compatibility across multiple protocols and legacy systems. This would be ideal for someone who really enjoys getting to grips with how systems work and wants to contribute to solving complex engineering problems. The following tasks are not exhaustive but will give you a good indication ...

ensuring compatibility across multiple protocols and legacy systems. This would be ideal for someone who really enjoys getting to grips with how systems work and wants to contribute to solving complex engineering problems. The following tasks are not exhaustive but will give you a good indication ...

integrations, identify security gaps and help deliver improvements. Alongside this, you'll shape new customer portals and ecommerce functionality, supporting the replacement of legacy systems. This Ecommerce & Payments Technical Lead role offers the opportunity to tackle immediate payment fraud challenges while helping build secure, reliable online experiences … secure checkout journeys. Implementing payment integrations and digital wallet functionality. Guiding developers through technical design, implementation and testing. Supporting the replacement of legacy ecommerce functionality. What's in it for you? £500-£600 per day. Fully remote working. A 12-month contract. Ownership of meaningful ecommerce and payment ...