About the Position

RedCore is building a new HR product from scratch! We are looking for a senior engineer who enjoys working closely with Product, takes ownership of architecture decisions, and can build scalable systems from the ground up. This is a hands-on role with real impact on product direction and technical foundations.

Responsibilities

Be ready to be a core player in the team
Design, develop, and maintain a scalable product using.NET and React
Build clean, maintainable, and well-documented code
Optimise application performance, reliability, and security
Design and maintain database structures in PostgreSQL
Integrate third-party APIs and AI services
Collaborate closely with Product, Design, and Engineering teams
Participate in Agile processes and continuous improvement

Requirements

5+ years of professional experience in fullstack development using the latest.NET Core and React (TypeScript)
Strong proficiency in ASP.NET Core and modern C#
Strong experience with relational databases (preferably PostgreSQL and ORM tools (EF Core)
Hands-on experience designing and optimising database schemas and queries
Experience with Docker and GCP/AWS-based deployments
Experience building products from scratch in dynamic environments
Solid understanding of REST API design principles
Practical knowledge of unit and integration testing
Strong understanding of security best practices and performance optimisation
Experience designing scalable backend architectures
Understanding of monitoring and observability best practices

Nice to Have

Production-based experience to work with AI agents and modern AI tools (Cursor, Copilot, Codex, etc.)
Experience integrating AI services (e.g. OpenAI, Azure OpenAI, Anthropic)
Experience with Jira integration

Soft Skills

Are product-minded and customer-focused
Strong problem-solving skills and collaborative mindset
Understand that successful products are built around user value
Enjoy collaborating with Product and proposing your own ideas
Balance Engineering and Product goals
Are proactive and comfortable solving complex challenges

We Offer

An exciting and challenging job in a fast-growing business group, the opportunity to be part of a multicultural team of top professionals in Development, Architecture, Management, Operations, Marketing, Legal, Finance and more.
Great working atmosphere with passionate experts and leaders, sharing a friendly culture and a success-driven mindset is guaranteed.
Beautiful offices in Warsaw, Limassol, Yerevan - work remotely or on-site with comfort and enjoy the opportunity to build a network of connections with professionals day by day.
Modern corporate equipment based on macOS or Windows and additional equipment are provided.
Paid vacations, sick leave, personal events days, days off.
Corporate health insurance program for your well-being.
Referral program - enjoy cooperation with your colleagues and get the bonus.
Educational programs: regular internal training sessions, compensation for external education, attendance of specialized global conferences.
Rewards program for mentoring and coaching colleagues.
Free internal English courses.
In-house Travel Service.
Multiple internal activities: online platform for employees with quests, gamification, presents and news, RedCore clubs for movie / book / pets lovers, special office days dedicated to holidays.
Company events, team buildings.

About the Company

RedCore is a dynamic and innovative company dedicated to creating cutting-edge HR solutions. Our team is composed of passionate experts and leaders who share a friendly culture and a success-driven mindset. We offer beautiful offices in Warsaw, Limassol, and Yerevan, providing the flexibility to work remotely or on-site. Our commitment to providing modern corporate equipment and a comprehensive benefits package ensures a supportive and rewarding work environment.

Tech – Software Engineer (Fullstack)

Job description