Senior Full-Stack Developer (.NET / React)
SaltSquare · Tuzla/Sarajevo, Federacija Bosne i Hercegovine, Bosnia and Herzegovina ·
- Work mode
- Hybrid
- Seniority
- Senior
- Employment
- Contract
- Category
- Fullstack
Salt Square is a growing outsourcing company providing high-quality software development services to clients across a wide range of industries. Our team is composed of skilled and dedicated professionals delivering innovative solutions that meet and exceed client expectations.
Our mission is to build reliable, scalable, and future-ready digital solutions tailored to each client’s unique business needs. We foster a team-first culture where collaboration, continuous learning, and technical excellence are core values. From supporting startups in launching their first products to helping global enterprises scale their operations, we strive to deliver outstanding value on every project.
We are looking for a strong Senior .NET/React Developer to join our engineering team. The primary focus is backend development in .NET Core/C#, with regular contributions to the React/TypeScript frontend. You will be expected to drive architectural decisions, set technical direction, mentor mid-level developers, and ship production-quality code across the full stack.
Develop and maintain full-stack features with a backend-heavy split (roughly 70/30 .NET Core to React)
Design, build, and document RESTful APIs consumed by web clients
Drive architectural decisions and take ownership of technical direction within the team
Mentor mid-level developers, conduct code reviews, and uphold engineering standards
Identify and resolve performance bottlenecks, technical debt, and reliability issues proactively
Participate in Agile sprint ceremonies, contribute to estimation, and communicate blockers and risks early
Leverage AI-augmented development practices to accelerate delivery and improve code quality
Deep proficiency in .NET Core, C#, and ASP.NET Core Web API, with a track record of building and scaling backend services in production
Strong working knowledge of React.js and TypeScript, able to build, maintain, and review frontend code with confidence
Experience with SQL databases (PostgreSQL or SQL Server), including query optimization, schema design, and performance tuning
Hands-on experience with Entity Framework Core or equivalent ORM, including migrations and complex query patterns
Proven ability to design, build, and document RESTful APIs with attention to versioning, error handling, and contract-first approaches
Solid understanding of software design patterns, SOLID principles, and clean architecture
Version control with Git and experience with collaborative branching strategies
Agile/Scrum methodology experience with clear communication and the ability to unblock others
Active use of AI tools in daily development workflows (Copilot, Claude, Cursor, or similar), not just familiarity but demonstrated integration into how they write, review, and ship code
Experience with Microsoft Azure (App Service, Key Vault, Azure DevOps), though equivalent cloud experience (AWS, GCP) transfers well
Comfortable with Docker: writing Dockerfiles, multi-stage builds, and running services locally in containers
Ability to maintain or contribute to CI/CD pipelines (GitHub Actions, Azure DevOps Pipelines), not expected to own pipeline infrastructure but should not be blocked by it
Familiarity with microservices architecture and event-driven design patterns
Experience with frontend design systems, component libraries, or TailwindCSS/ShadCN
Familiarity with GoLand IDE and experience using it for Go development, debugging, and project management.
Competitive salary and benefits package.
23 days of paid leave.
Opportunities for professional growth and development.
A collaborative work environment with talented and dedicated colleagues.
We offer a supportive work environment where your ideas are heard and your contributions make a real difference. If you’re passionate about building great products, we’d be excited to have you on board.