1 to 25 of 29 Permanent Legacy Systems Jobs in Central London

scale financial data platform. You'll be working with the technology team, supporting a core platform modernisation initiative. Our environment combines long-established enterprise systems and legacy components with modern cloud-based services running on AWS. The platform processes high-volume structured financial data and underpins both … internal systems and customer-facing products. A substantial portion of the platform is built on large SQL Server data estates, making strong SQL expertise non-negotiable. You will play a key role in modernising core systems, improving performance and reliability, and delivering scalable services for the next generation ...

IR35 £700–£750 per day The Role You will support the evolution of a large-scale financial data platform, modernising legacy enterprise systems while building scalable cloud-based services on AWS. Own SQL Server optimisation, backend service design, and API development in a high-impact platform modernisation … performance tuning, indexing, complex queries) – non-negotiable Backend development in Python or C# AWS environment experience Proven experience in enterprise or legacy systems – critical Strong analytical and problem-solving abilities We'd expect you to have around 10 years of software and data engineering skills. Nice ...

Title: Senior Systems Engineer (eDV Clearance required) Location: Hybrid In London Employment Type: Permanent Salary: Up to £98,000 + package Start Date: Immediate Industry: IT Services & Consulting We’re supporting a specialist consultancy delivering cutting-edge programmes across the UK Defence and National Security space. They’re looking … Senior Systems Engineer to lead the delivery of complex, mission-critical systems across secure environments. This is a high-impact role where you’ll bridge strategy and engineering - shaping solutions that integrate cloud, data, and AI technologies into secure, safety-critical systems. Senior Systems Engineer – Key Responsibilities ...

advanced data pipelines with Python, SQL, Spark/PySpark and Delta Lake. Champion strong data quality, governance and observability practices. Modernise legacy systems and support large-scale migrations into Azure. Provide technical leadership, set engineering standards and contribute to architectural decisions. Mentor engineers and foster a culture ...

individuals as all work will require extensive collaboration with engineers and stakeholders across many teams. Key Responsibilities: Collaborate with engineers of legacy systems to understand what data is available and the form it takes Design queries & scripts to extract and transform data from … based workflows, code reviews, and CI/CD practices. Preferred Qualifications: Have used Azure cloud services previously Experience with streaming/event-driven systems e.g., Kafka/Kinesis Experience with infrastructure as code e.g., Terraform and containerization e.g., Docker/Kubernetes Familiarity with data governance, cataloging, lineage, and privacy ...

ontology capabilities. Experience in multi-cloud and data migration environments: Experience working with data environments in Microsoft Asure, AWS, and legacy systems, and a proven ability to consolidate and migrate data processes and workloads into Palantir Foundry as part of a broader data strategy. Data-driven business ...

products. With a strong reputation for solving complex technical challenges, they work with leading organisations to deliver AI-enabled solutions, modernise legacy systems, and build high-performance applications. Their teams are distributed globally and operate in a highly collaborative, engineering-led environment. The Role As a Technical ...

containers, serverless, broader ecosystem) What They're Looking For Strong platform/solution architecture experience in modern cloud environments Background building scalable, distributed systems Ability to operate at a senior stakeholder level Strong communication and influencing skills A modern engineering mindset (not tied to legacy approaches … This Role Shape a next-generation platform, not maintain legacy systems High visibility with direct impact on business growth and platform direction Environment investing heavily in modern engineering and cloud If you think you have the necessary skills and experience then please apply now! McGregor Boyall ...

Risk Management frameworks Participate in Show and Tell sessions with stakeholders Troubleshoot, debug, and enhance existing applications Evaluate and improve legacy systems, including reprogramming and adding new features Produce technical documentation, user guides, and training materials Collaborate with IT teams to define specifications for new development Provide ...

Technical Leadership Own the architecture of the company's data platform, ensuring scalability, reliability, and security. Drive modernisation by transitioning from legacy systems to a lean, scalable platform. Act as a lead expert for technologies such as AWS, DBT, Airflow, and Databricks. Establish best practices for data ...

large volume of valuable financial data and are in the process of modernising their data infrastructure, moving away from legacy systems towards a scalable, cloud-native stack. What you'll be working on: Building and maintaining scalable data pipelines using Airflow and dbt Working across AWS cloud ...

Hybrid) Sector: Specialty Insurance & Reinsurance Type: Permanent | Senior Leadership Are you a future-focused Solution Architect who thrives on tackling complex challenges, modernising legacy ecosystems, and influencing enterprise-wide technology strategy? A global, financially rock-solid specialty insurer is expanding its Architecture function and is looking … Opportunity Stands Out Enterprise influence – You’ll shape the roadmap for multiple business domains and play a key role in retiring legacy systems and designing modern, modular, cloud-ready platforms. True architecture ownership – From concept to approval, you are the accountable design authority for critical initiatives. Innovation ...

Application Include a cover letter (300–400 words) covering: A production system you have owned end-to-end Your experience modernising legacy systems or untangling complex business logic How you have used AI tools in the SDLC — what worked, what didn't, what you learned Why this ...

products for every occasion. The Role My client are going through an enterprise-wide modernisation which will include the upgrading of legacy systems, re-platforming their ecommerce solution, the implementation of a new CRM & marketing solutions and other customer engagement technologies. Key Responsibilities Architecture Leadership : Define ...

Responsibilities Analyse and assess data structures across legacy and target systems. Perform data extraction, transformation, and migration activities. Conduct data cleansing, enrichment, and validation to ensure high data quality. Identify and resolve data inconsistencies, duplicates, and quality issues. Develop and maintain data mapping documentation between source and target ...

bespoke builds and third-party solutions. Oversee the execution of data initiatives , ensuring accurate integration, transformation, and flow of data across systems, while aligning technical delivery with business priorities and regulatory requirements. Contribute to aligning delivery with overall business goals, helping drive growth, process efficiencies, and digital transformation. Play … technology teams accountable for delivery. Partner closely with the Head of Technology on technical decisions and data strategy. Influence decisions around legacy systems, streamline processes in collaboration with Technology, and contribute to global transformation initiatives. Required Skills & Expertise: Minimum of 5 years’ experience in a Product Owner ...

Cloud finance processes and issue resolution. Executed and validated finance data migration activities, including data mapping, cleansing, reconciliation, and migration from legacy systems into IFS Cloud. Collaborated with cross-functional teams (IT, functional consultants, and stakeholders) to ensure successful integration, reporting accuracy, and continuous improvement of finance ...

associated Capability Architecture. This position will also have a focus on aligning business processes and capabilities to enable the replacement of legacy systems and support a wider business transformation, defining architectural principles and supporting the business case for the ERM/ERP programme. For this role ...

across core back-office platforms including HR, Finance, and ERP. You'll lead the design of scalable, integrated architectures that modernise legacy systems and enable efficient, data-driven operations. Acting as a subject matter expert, you'll define target architecture, support business cases, and ensure technology choices … party providers, and guide teams to deliver high-value outcomes. We're looking for a pragmatic, influential architect with strong experience across HRIS, finance systems, ERP platforms, and enterprise integration within complex environments. A key role driving the evolution of critical business systems. ...

underpins Outsmart’s crowdsourcing operations – a mature, revenue-generating system that has evolved over years and continues to scale. If you enjoy owning real systems, thinking architecturally, improving legacy code thoughtfully rather than rewriting it, and being trusted to deliver without heavy supervision, this role will feel … unusually well-matched. The role As Senior Fullstack Software Engineer, you will help design, build and maintain the production systems that power Outsmart’s platform. You’ll work closely with our CTO, operating as a high-agency individual contributor with genuine ownership across backend systems, infrastructure and platform ...

embed directly with Global 2000 partners to bring frontier AI models into their core operations. You will build the same advanced, stateful agentic systems as top-tier applied AI teams, combining elite engineering with exceptional stakeholder communication to drive massive, tangible impact on the world's most complex businesses. … agents, and tool-use pipelines connected to SAP, Salesforce, and ServiceNow. 🌉 Bridge frontier reasoning models ( Anthropic Claude, OpenAI GPT ) with legacy enterprise systems, owning the integration model from VNet peering through to InfoSec and DLP clearance. 🤝 Run daily, collaborative sessions with client Subject Matter Experts. ...

across core back-office platforms including HR, Finance, and ERP. You'll lead the design of scalable, integrated architectures that modernise legacy systems and enable efficient, data-driven operations click apply for full job details ...

deep expertise in Microsoft Power Platform and related technologies. Proven ability to design end‐to‐end solutions that integrate with a range of legacy and modern systems. Proficiency with programming and scripting languages such as JavaScript, SQL, Java, C#, or similar. Skilled at simplifying complex technical concepts ...

wider business. This role will play a key part in driving that change and supporting the ongoing development of the organisation’s HR systems landscape. The primary focus of the position is to support the newly implemented HR system, SAP SuccessFactors, alongside associated modules including Employee Central, Employee Central … Learning, Performance, and Onboarding. A strong emphasis will be placed on data, reporting, and analytics. This is an excellent opportunity for an experienced HR systems professional who enjoys working at the intersection of technology, people data, and process improvement. Key Responsibilities Support integration activities between HR systems ...

leading liquidity providers in Europe that is looking to expand its Trading platform team. The team focuses on both low level hardware systems and high-level architectural designs of large scale systems. The platform is built to be scalable, meaning you will work on developing largescale systems that … number of hours worked (free to work at your own pace and deliver quality work). There are no legacy systems or bureaucracy to hold you back, very flat structure, allowing everyone, including the CEO, to be hands-on. What you'll need: Excellent Rust or modern ...