19 of 19 Permanent Legacy Systems Jobs in Yorkshire

Our client is a leading Finance Company seeking a talented .NET Developer to join their web application development team. This is an exciting opportunity to work on both legacy system modernization and new developments as they migrate from .NET Framework 4.8 to .NET 8 MVC and expand their digital capabilities. The Role Design, develop, and maintain web applications … across their Intranet and Internet platforms Modernize legacy .NET Framework 4.8 applications to .NET 8 MVC Develop RESTful APIs and integrate with web services Work using Agile methodologies with project managers and internal teams Technical Requirements Essential Skills: 4+ years commercial development experience .NET Framework 4.8 MVC and/or .NET 8 MVC (we're migrating to .NET … Highly Beneficial: Recent .NET 8 MVC experience (preferred for our modernization efforts) Blazor framework knowledge Azure cloud platform experience Mobile application development SSRS/Crystal Reports Experience with legacy system migration projects What We're Looking For 4+ years commercial development experience Strong understanding of MVC architecture and clean coding practices Self-motivated with excellent problem-solving skills More ❯

Our client is a leading Finance Company seeking a talented .NET Developer to join their web application development team. This is an exciting opportunity to work on both legacy system modernization and new developments as they migrate from .NET Framework 4.8 to .NET 8 MVC and expand their digital capabilities. The Role Design, develop, and maintain web applications … across their Intranet and Internet platforms Modernize legacy .NET Framework 4.8 applications to .NET 8 MVC Develop RESTful APIs and integrate with web services Work using Agile methodologies with project managers and internal teams Technical Requirements Essential Skills: 4+ years commercial development experience .NET Framework 4.8 MVC and/or .NET 8 MVC (we're migrating to .NET … Highly Beneficial: Recent .NET 8 MVC experience (preferred for our modernization efforts) Blazor framework knowledge Azure cloud platform experience Mobile application development SSRS/Crystal Reports Experience with legacy system migration projects What We're Looking For 4+ years commercial development experience Strong understanding of MVC architecture and clean coding practices Self-motivated with excellent problem-solving skills More ❯

Our client is a leading Finance Company seeking a talented .NET Developer to join their web application development team. This is an exciting opportunity to work on both legacy system modernization and new developments as they migrate from .NET Framework 4.8 to .NET 8 MVC and expand their digital capabilities. The Role Design, develop, and maintain web applications … across their Intranet and Internet platforms Modernize legacy .NET Framework 4.8 applications to .NET 8 MVC Develop RESTful APIs and integrate with web services Work using Agile methodologies with project managers and internal teams Technical Requirements Essential Skills: 4+ years commercial development experience .NET Framework 4.8 MVC and/or .NET 8 MVC (we're migrating to .NET … Highly Beneficial: Recent .NET 8 MVC experience (preferred for our modernization efforts) Blazor framework knowledge Azure cloud platform experience Mobile application development SSRS/Crystal Reports Experience with legacy system migration projects What We're Looking For 4+ years commercial development experience Strong understanding of MVC architecture and clean coding practices Self-motivated with excellent problem-solving skills More ❯

Senior Software Engineer to join one of their most forward-thinking teams. This role offers the chance to be part of something genuinely transformative: moving from legacy systems to a modern, cloud-native platform built with .NET 8, AWS, Docker, GraphQL and Terraform. The systems you'll help build are critical to the daily operations of … engineering, product and DevOps to shape solutions end to end. What Youll Be Doing Designing and building robust, scalable services in .NET 8 Helping drive the shift from monolithic systems to distributed, microservices-based architecture Writing clean, maintainable and well-tested code Actively contributing to code reviews, knowledge sharing and mentoring Working with a modern engineering toolset including AWS … DynamoDB, Aurora), Docker, Terraform Eventing & APIs: Kafka, GraphQL, REST CI/CD: GitHub Actions Data: PostgreSQL, DynamoDB, DocumentDB What We're Looking For Solid experience building modern, cloud-based systems using .NET and AWS Strong understanding of software design principles, clean code, and TDD Exposure to infrastructure-as-code and cloud automation (ideally Terraform) A collaborative mindset and the More ❯

Day of the role: Lead the development of BI Solution Architecture, Replication Warehouse, and secure data sets using the Microsoft application stack. Create and maintain secure data sets for systems, enabling Key users to produce reports. Perform ETL integrations and support tasks using Azure Data Factory (ADF) and other technologies. Coach and mentor junior BI professionals. Test and modify … new data sets and reports to ensure reliability and operational continuity. Address data integrity, quality, and robustness issues in legacy/system data to enhance reporting. Develop and update BI process maps that underpin system architecture and configuration. Drive excellence through effective and efficient use of systems. Document business requirements and consult with end users to ensure evolving More ❯

Day of the role: Lead the development of BI Solution Architecture, Replication Warehouse, and secure data sets using the Microsoft application stack. Create and maintain secure data sets for systems, enabling Key users to produce reports. Perform ETL integrations and support tasks using Azure Data Factory (ADF) and other technologies. Coach and mentor junior BI professionals. Test and modify … new data sets and reports to ensure reliability and operational continuity. Address data integrity, quality, and robustness issues in legacy/system data to enhance reporting. Develop and update BI process maps that underpin system architecture and configuration. Drive excellence through effective and efficient use of systems. Document business requirements and consult with end users to ensure evolving More ❯

office, flexible working hours The client are looking for an experienced .Net Developer to join the team and hit the ground running on the migration of legacy systems into the web, this is just 1 of a range of greenfield projects you will have to work on, their client base spans across multi-nationals and smaller UK … the .Net tech stack Solid experience with ASP.NET Core Must be comfortable working with REST API's Experience working with SQL/SQL Server Experience working with version control systems e.g Git Desirables Experience with JavaScript frameworks e.g ReactJS and AngularJS Experience with Winforms Working knowledge of NodeJS Azure DevOps What they're offering Salary More ❯

and delivering high-quality customer service in a fast-paced environment. Role Responsibilities Provide 2nd and 3rd line support for Dynamics 365 Business Central and legacy NAV systems Act as the escalation point for complex support tickets across all BC modules, with a focus on finance-related issues Troubleshoot functional and technical issues, identifying root causes and … suggest process or system improvements Assist with testing and deployment of patches, updates and new functionality Provide user training and support post go-live to ensure smooth adoption of systems Knowledge & Skills Strong support experience with Dynamics NAV and Dynamics 365 Business Central Proven background in handling complex support cases within a Microsoft Partner or end-user environment Excellent … across finance, sales, purchasing, inventory and warehousing Strong communication skills and ability to manage client expectations effectively Logical problem solver with great attention to detail Familiarity with support ticketing systems and service desk processes What's on Offer Salary up to £50,000 25 days holiday plus bank holidays Remote or hybrid working options to suit your lifestyle Progression More ❯

skills in a supportive environment. Their core platform is written in WinForms, and they're happy to consider developers from modern web backgrounds who are open to learning legacy technologies. You'll be supported by a collaborative team with strong focus on personal development, including access to Pluralsight and Udemy subscriptions. The role requires 3 days per week … work-life balance with hybrid flexibility. Technical Requirements: Commercial experience with C#, .NET, and SQL Server Proactive mindset and excellent communication skills Willingness to work with legacy systems alongside modern development Beneficial experience (training provided): Experience with WinForms Exposure to JavaScript frameworks This role offers excellent stability and growth potential within an established, profitable business where you More ❯

skills in a supportive environment. Their core platform is written in WinForms, and they're happy to consider developers from modern web backgrounds who are open to learning legacy technologies. You'll be supported by a collaborative team with strong focus on personal development, including access to Pluralsight and Udemy subscriptions. The role requires 3 days per week … work-life balance with hybrid flexibility. Technical Requirements: Commercial experience with C#, .NET, and SQL Server Proactive mindset and excellent communication skills Willingness to work with legacy systems alongside modern development Beneficial experience (training provided): Experience with WinForms Exposure to JavaScript frameworks This role offers excellent stability and growth potential within an established, profitable business where you More ❯

skills in a supportive environment. Their core platform is written in WinForms, and they're happy to consider developers from modern web backgrounds who are open to learning legacy technologies. You'll be supported by a collaborative team with strong focus on personal development, including access to Pluralsight and Udemy subscriptions. The role requires 3 days per week … work-life balance with hybrid flexibility. Technical Requirements: Commercial experience with C#, .NET, and SQL Server Proactive mindset and excellent communication skills Willingness to work with legacy systems alongside modern development Beneficial experience (training provided): Experience with WinForms Exposure to JavaScript frameworks This role offers excellent stability and growth potential within an established, profitable business where you More ❯

as a technical contributor to solve complex problems, shaping architecture, and mentoring engineers to do their best work and advance their careers. You'll work across our control plane systems, influence cross-team roadmaps, and bring pragmatic engineering practices into how we build, test, and operate infrastructure software. This is not a "stay in your swim lane" role. You … there's ambiguity, and momentum where there's inertia.This role includes participation in an on-call rotation -we believe in shared ownership of our platform and aim to build systems that are resilient, observable, and require minimal intervention. Key Responsibilities: Architect and implement scalable, secure Kubernetes-based infrastructure for multi-cloud and hybrid environments. Lead technical direction for core … and help shape how Fleet scales its impact across the company. Knowledge, Skills, and Abilities: 7+ years of engineering experience, with at least 2+ in infrastructure, platform, or backend systems roles. Deep expertise in Kubernetes internals and operations , including networking, scheduling, scaling, and controller patterns. Proven ability to design and build systems from scratch , making pragmatic tradeoffs along More ❯

hands-on while mentoring developers, shaping technical direction, and delivering high-impact client solutions. Key duties Translate client needs into scalable, maintainable architectures. Refactor and improve Legacy systems with a focus on performance and security. Prioritise delivery with PMs and support early-stage solution design. Drive clean code, peer reviews, and team mentoring. Use 10% of time More ❯

culture of CI/CD, test automation and modern practices Sharp thinking, clear communication and the ability to speak to both engineers and execs Experience managing legacy systems & a passion for building something better Want to know more? Drop me a message or apply direct - happy to run you through the scope. More ❯

DevOps, CI/CD, TDD/BDD, and cloud-native development practices. Technology & Operations Work closely with the Head of Architecture and Platform teams to modernise legacy systems and reduce technical debt. Promote scalability, resilience, and observability across our engineering landscape. Own SLAs, operational metrics, and runbooks for engineering-owned systems and services. Cross-functional Collaboration More ❯

Build and maintain extensions, integrations and custom modules to meet client-specific needs Collaborate with functional consultants to translate requirements into robust technical specifications Upgrade legacy NAV systems to Business Central, ensuring minimal disruption and improved functionality Optimise performance and ensure code quality through testing, peer reviews and best practice development Provide technical support and troubleshooting for More ❯

Commercial bank seeking to help Britain prosper and we're transforming our products and platforms with £3bn of investment to become the bank of the future. With 789 software systems and 26,000 servers we're servicing 80,000 colleagues, 30m+ customers, and over 14m+ online users you can be confident our IT professionals have sizeable and interesting challenges … every single day. In this role, you'll deliver highly complex technical support for systems and processes in mainframe environments, focusing on decommissioning and bug fixing. You'll help maintain and help migrate services according to Group standards and policies (and to agreed service levels) and will assist with the delivery of investment funded work within mainframe environments - this … includes out of hours. Additionally, you'll provide technical support (including incident and problem resolution for systems and processes in complex environments) - again this includes out of hours support. Key responsibilities Provide support for complex environments to tight timescales. Help drive the strategy and design across the mainframe development and test estate. Work closely with key stakeholders, drive and More ❯

opportunity to step into a strategically critical role with a defined succession plan. The Opportunity A leading European manufacturer is seeking an experienced Applications Manager to oversee their enterprise systems landscape. You’ll be responsible for rationalising legacy systems, leading enhancements and support, and managing an Applications team of 8. This is a business-critical role … with influence across ERP, factory systems, and corporate applications. You’ll work closely with the current IT Director, who is planning retirement within 3–5 years. The right candidate will be in a strong position to step into that leadership role with full support and knowledge transition. What You’ll Be Doing Leading the application and integration portfolio across … multiple sites Managing and enhancing systems including ERP and shop-floor technologies Owning vendor relationships and third-party contracts Supporting CAPEX submissions and governance processes Leading a team of Business Analysts, SAP Consultants and Integration Support staff. Consolidating multiple ERP systems and instances to a more cost effective and simple model. Driving release planning, application roadmaps, and rationalisation More ❯

Business Development Manager - OEMs & Systems Integrators "Drive Strategic Sales in Engineered Technology for Mission-Critical Applications" Location: Remote/Hybrid (Field-based with regular visits to a Southern Home Counties HQ) Salary: 50,000- 70,000 base + Uncapped % Gross Margin (paid on order receipt) + Car Allowance + Benefits Realistic OTE: 120,000+ No cap on earnings for … high performers The Opportunity Are you a strategic B2B sales professional with experience selling engineered technology directly to OEMs and Systems Integrators? Do you thrive in long-cycle, high-value sales where you're selling solutions-not just boxes? This is a chance to join a well-established, specialist technology manufacturer with full in-house capability. The company provides … Known for supporting long-lifecycle hardware requirements where consistency and certification matter Role Overview As Business Development Manager, you will: Win and grow accounts with Tier 1 OEMs and Systems Integrators across key sectors such as: o Defence, Med-Tech, Rail, Automation, Energy, Transport, and Critical Infrastructure Lead design-to-order projects, often with complex stakeholder networks and More ❯