We are looking for a Senior .NET (WPF) Engineer to join a long-term product team working on a next-generation solution for ambitious and goal-oriented users. This product is designed for individuals striving for continuous personal and professional growth and is built as a platform-specific ecosystem with dedicated desktop and mobile applications. Responsibilities: * Develop and maintain native Windows desktop applications using WPF and .NET. * Design and implement secure offline-first solutions, ensuring data privacy and consistency on the client side. * Apply encryption best practices, including implementing cryptographic protocols and securely managing keys. * Handle complex multithreaded operations to ensure application responsiveness and stability. * Integrate authentication systems using OAuth and SRP, and manage session security with JWT tokens. * Create and maintain custom UI designs, ensuring a smooth and modern user experience. * Ensure applications are always demo-ready and capable of being showcased during project milestones. * Communicate regularly with the client to align on requirements, present updates, and discuss solutions. * Collaborate with cross-functional teams, including product owners, designers, and QA. * Participate in code reviews, architecture discussions, and help shape the technical direction of the project.
Requirements: * 5+ years of experience with C#/.NET, with a strong focus on desktop application development * Solid experience with the WPF framework and the MVVM architectural pattern * Deep understanding of multithreading, thread synchronization, and ThreadPool usage. * Hands-on experience working with SQLite or other embedded local databases * Proven ability to build and support offline-first applications with high reliability * Strong knowledge of security concepts, including: Synchronous/asynchronous encryption, End-to-end encryption, Digital signatures. * Familiarity with cryptographic algorithms such as AES-256-GCM, Ed25519, X25519, CSPRNG, Diffie-Hellman, etc. * Experience with on-device encryption key generation and secure storage. * Experience integrating OAuth and SRP authentication flows with third-party identity providers. * Proficiency in JWT token management (access & refresh tokens). * Experience building desktop applications with custom UI and publishing them to the Microsoft Store. * Strong understanding of RESTful API integration and WebSockets communication. * Excellent attention to detail and ability to consistently produce production-ready code. * English: Intermediate strong or higher for direct client communication.
Nice to have: * Experience with CRDTs (Conflict-free Replicated Data Types) or conflict resolution in distributed systems. * Familiarity with WPF MVVM libraries such as Prism, ReactiveUI, etc. * Knowledge of CI/CD processes for desktop apps.
Our Benefits: * Professional growth: Individual development plan, mentorship, reimbursement for professional certifications and English lessons, access to professional courses in Corporate Learning Management System. * Community: Tech community and knowledge-sharing events, English speaking club, corporate library and book club, volunteering and charity initiatives. * Wellbeing: Medical insurance, regular medical check-ups, sport reimbursement, paid vacation and sick leave, mental health support, and events. * Work environment: Fully-equipped offices, top-notch equipment, flexible work format, activities both in-office and online, Y-bucks, and access to the Yalantis store.
Please note that feedback on the results of the CV review will be provided only in the event of a decision to consider your candidacy further. Otherwise, your data will be retained in the company’s CV database, and we will gladly contact you if a suitable vacancy becomes available. The consideration period is 7 working days.
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