Senior .Net Developer

Industry: BankingContract: B2BRate: up to 160 PLN/hStart: ASAP (2 weeks notice max)We are looking for an experienced . Net Engineers to join a high-priority Wealth Planning & Investment project. The team will help shape, build, test, and launch a new customer product and supporting technology solution. The project will combine existing APIs and platforms with new backend and frontend development and requires close collaboration with business, architecture, security, compliance, legal, risk, and platform teams. Key ResponsibilitiesShape product requirements, scope, architecture, and success criteria. Assess and reuse existing APIs, services, data, and frontend capabilities. Design and build new backend services, integrations, APIs, and frontend experiences. Deliver iteratively, with early working increments and frequent stakeholder demos. Build in security, compliance, privacy, accessibility, resilience, and operational requirements. Support automated testing, CI/CD, deployment, documentation, and production stabilisation. Proactively manage dependencies, risks, and technical impediments. Team RequirementsStrong C# / modern . NET backend development experience. REST APIs, integrations, automated testing, CI/CD, and production support. Frontend development experience; frontend technology and proficiency must be stated for each engineer. Experience with secure coding, authentication/authorisation, monitoring, performance, and resilient service design. Ability to work across the full delivery lifecycle. Senior engineers must be able to lead technical workstreams, resolve ambiguity, coach colleagues, and maintain engineering quality under time pressure.