Senior .NET Developer (Desktop Applications)

As part of Endava's strategic partnership with WTW, who provide data-driven, insight-led solutions in the areas of people, risk and capital, we're building dedicated software engineering teams to support WTW's Insurance Consulting and Technology Division. WTW's Insurance Consulting and Technology business is a global leader in P&C, Life and Health insurance software and advisory services, with over 1,700 colleagues across 35 markets. More than 1,000 insurers worldwide trust our combination of advisory insight and advanced software to help them navigate complexity and drive sustainable growth. Joining Endava, you'll work exclusively with WTW to help embed AI-enabled engineering practices, modern ways of working and deep insurance technology expertise, contributing to the next generation of products and services for insurers worldwide. Working as part of a dedicated team established through a Build-Operate-Transfer (BOT) model, you'll collaborate closely with WTW while building your career as an Endava employee, supporting the long-term success of this strategic partnership. About the Role As a Senior Engineer, you will design, develop and maintain the WTW ResQ insurance reserving product, taking ownership of complex features and technical areas. You will help the team make sound engineering decisions, improve quality and deliver changes safely across an established desktop product and its integrations. You will work closely with engineers, the Team Lead and insurance or actuarial stakeholders to clarify requirements, assess technical options and deliver reliable outcomes. You will share knowledge and support other engineers, while contributing to the responsible use of agentic AI in software development and internal knowledge sharing. Release and production-support activities take place during normal office hours, under the support arrangements agreed between WTW and Endava. The role does not include out-of-hours or on-call support. Key Responsibilities Engineering and technical design · Design, implement and maintain ResQ features using C#, .NET 10 and .NET Framework 4.7.2, including hands-on development, refactoring and defect fixes. · Develop and support WPF desktop applications and integrations involving COM interfaces, SQL Server, SignalR and MassTransit. · Contribute solution recommendations and input to technical design and architecture discussions, working with the Team Lead and WTW’s ResQ engineering and architecture owners to turn product requirements into maintainable, supportable solutions. WTW retains product-wide architectural and policy authority. Quality and engineering practices · Review code and provide practical guidance to teammates; share knowledge of the codebase, application behaviour and engineering practices, and maintain technical documentation and runbooks for assigned components. · Design, implement, maintain and execute unit, integration and regression tests, including Ranorex GUI automation for assigned C# components; · Monitor and triage security scan findings for assigned components, remediate issues within the agreed backlog and WTW’s security standards, and escalate shared-component or policy issues to WTW’s security owners. · Use approved agentic coding tools to explore code, trace workflows, draft bounded implementation changes, generate tests and support refactoring; review and verify outputs before adoption, and share practical learning to support the team’s responsible adoption of AI-enabled engineering practices. Releases and application support · Use Azure DevOps Pipelines and Git/GitHub in development and release activities; maintain CI/CD pipelines and build, installation and deployment tooling for assigned components, resolve related build and test failures, apply relevant patches and retire unused resources within WTW guidance and access permissions. · Support WTW’s release and urgent-patch planning, readiness checks, demonstrations and support handover for assigned components. · Investigate defects and production issues, identify root causes and contribute fixes and preventative improvements; participate in customer calls through WTW’s support route to provide technical assistance for assigned components during agreed working hours and within agreed support arrangements. Delivery ownership and collaboration · Own delivery of assigned complex changes and technical components; contribute to analysis, refinement and estimation, create and maintain stories and technical tasks for assigned work, conduct technical spikes and communicate progress, risks and dependencies early. · Collaborate with the team to ensure sustainable run of scrum ceremonies, including when needed, planning, estimation, refinement, reviews and retrospectives; facilitate follow-up and help resolve blockers. · Collaborate with the incumbent team, relevant insurance or actuarial stakeholders and WTW’s product, architecture, QA, DevOps, infrastructure, security and support teams to clarify needs, address cross-component dependencies and support continuous improvement. • Strong professional experience developing applications with C# and .NET. • Experience with both modern .NET and .NET Framework applications; familiarity with .NET 10 and .NET Framework 4.7.2. • Experience working with SQL Server and application integrations; familiarity with COM interfaces, SignalR or MassTransit. • Experience contributing to technical design, code reviews and engineering quality in a collaborative team. • Practical understanding of testing, debugging, versioning, packaging, deployment and production support for desktop applications. • Experience with Git-based development and familiarity with Azure DevOps Pipelines. • Ability to assess AI-generated code and other AI outputs critically and verify changes through review and testing. • Clear communication skills and the ability to work with engineers and business stakeholders. • At least 5 years of practical experience in the IT industry Desirable · Experience with insurance, actuarial or financial products. · Familiarity with PostgreSQL, Snowflake or Databricks, where relevant to the product roadmap. · Experience using AI-assisted development workflows or internal knowledge tools grounded in enterprise code and documentation. · Experience using approved AI tools to support software engineering and knowledge management. · Experience with WPF and desktop application development For this position, the gross base salary starts from PLN 19 267 PLN Gross per month (full-time employment contract), determined using objective and gender-neutral criteria including skillset, experience and role responsibilities. Our benefits offering typically include private medical insurance, dental plan, and glasses reimbursement. The figure represents the initial remuneration we expect to offer for this role and does not limit the right to equal pay for women and men performing the same work or work of equal value. All remuneration and benefits decisions are based on non-discriminatory, gender-neutral criteria, and in accordance with the Polish Labour Code amendments implementing Directive on pay transparency, we do not request or consider candidates’ current or past remuneration during the recruitment process.” At Endava, we’re committed to creating an open, inclusive, and respectful environment where everyone feels safe, valued, and empowered to be their best. We welcome applications from people of all backgrounds, experiences, and perspectives—because we know that inclusive teams help us deliver smarter, more innovative solutions for our customers. Hiring decisions are based on merit, skills, qualifications, and potential. If you need adjustments or support during the recruitment process, please let us know.