.NET Lead Software Engineer

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 We are looking for a Lead Software Engineer to lead the technical delivery of the team working on the WTW ResQ insurance reserving product while remaining hands-on in software development. The role combines engineering leadership with selected team coordination responsibilities, including planning, facilitating delivery discussions and helping remove blockers. The team will take ownership of an existing desktop product and its integrations. The role requires experience with the full desktop application lifecycle, from development and testing through packaging, deployment and production support, and the ability to guide the responsible use of agentic AI in engineering. While ensuring team leadership and technical guidance, you’ll also be coordinating with the extended ResQ team in aligning priorities, planning releases, consulting on solutioning and best practices, collaborating on fixes and, when needed supporting clients on technical issues. The role assumes an end to end ownership of the allocated components. 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 · Lead hands-on ResQ development using C#, .NET 10 and .NET Framework 4.7.2, including refactoring and defect fixes; review code, guide teammates and maintain technical documentation and runbooks. Develop and support WPF desktop applications and integrations using COM interfaces, SQL Server, SignalR and MassTransit. · Design, maintain and execute unit, integration, regression and Ranorex GUI tests for assigned C# components within WTW’s QA framework and Definition of Done. · Support sustainable Scrum ceremonies, including planning, refinement, reviews and retrospectives; facilitate follow-up and help remove blockers. · Own the delivery of complex changes and assigned components, developing a strong understanding of the product, its users and client needs. Work with stakeholders to identify and clarify requirements, shape and prioritise the team backlog, analyse, refine and estimate work, maintain stories and tasks, conduct technical spikes, and communicate progress, risks and dependencies early. · Collaborate with the incumbent team, insurance and actuarial stakeholders and WTW’s product, architecture, QA, DevOps, infrastructure, security and support teams to clarify needs, manage dependencies and improve delivery. · Provide technical leadership and design recommendations with WTW’s ResQ engineering and architecture owners, translating requirements into maintainable, supportable solutions. WTW retains product-wide architectural and policy authority. · Establish AI-enabled ways of working and guide responsible adoption of approved agentic tools for code exploration, implementation, testing and refactoring; verify outputs and share learning. Promote responsible use of internal knowledge tools grounded in ResQ code, knowledge transfer materials, Azure DevOps and documentation, checking source references and flagging uncertainty. · Use Azure DevOps Pipelines and Git/GitHub; maintain assigned components’ CI/CD, build, installation and deployment tooling, resolve related failures, apply relevant patches and retire unused resources within WTW guidance and access permissions. · Triage security scan findings, remediate agreed issues to WTW standards and escalate shared-component or policy concerns to WTW’s security owners. · Address versioning, configuration, compatibility, packaging, deployment and existing-version support; assist WTW with release and urgent-patch planning, readiness checks, demonstrations and support handover for assigned components. · Investigate defects and production issues, identify root causes and deliver fixes and preventative improvements; provide technical assistance on WTW-requested customer calls through its support route, within agreed hours and support arrangements. Qualifications • Strong professional experience in C# and .NET application development. • Experience with both modern .NET and .NET Framework applications, including .NET 10 and .NET Framework 4.7.2. • Strong experience building and maintaining WPF desktop applications. • Experience with SQL Server, COM interfaces and application integrations. • Familiarity with SignalR and/or MassTransit. • Experience with Azure DevOps Pipelines and Git-based development. • Practical understanding of desktop application testing, packaging, deployment, compatibility and production support. • Experience providing technical leadership, mentoring engineers and coordinating delivery. • Experience using approved AI tools to support software engineering and knowledge management. • Strong communication skills and ability to work with technical and business stakeholders. • At least 5 years of practical experience in the IT industry. Desirable Skills: • Experience working with insurance, actuarial or financial products. • Familiarity with PostgreSQL, Snowflake or Databricks, where relevant to the product roadmap. • Experience introducing AI-assisted development workflows or internal knowledge tools grounded in enterprise code and documentation. For this position, the gross base salary starts from PLN 21 533 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.