HRMS, Middle Strong/Senior Full-Stack (.Net+React) Developer, JR129, JR130, JR183, JR182, JR199

Eleks; Poland; On-site; PLN 180,000 - 240,000; Full time

Job summary

ELEKS Software Engineering and Development Office is seeking a Middle Strong/Senior Full-Stack Developer (-.NET+React) for projects in Poland or Ukraine. The role focuses on building a Human Resources System for ministries in a US Government-funded project, using C#/.NET Core on the backend and React with TypeScript on the frontend.

Ideal candidates have 5+ years in software development, strong experience with ASP.NET Core Web API/MVC, SQL Server, Dapper, and modern security (OAuth2/OIDC/JWT).

Qualifications

• 5+ years of professional experience with C#/.NET
• Strong ASP.NET Core Web API & MVC experience
• Production experience with MS SQL Server
• Experience with Dapper
• Hands-on OAuth2/OIDC/JWT and secure cookies
• Redis for caching and distributed coordination
• Strong React + TypeScript experience
• Unit & integration testing; E2E testing using Cypress/Playwright
• Logging, distributed tracing (OpenTelemetry), metrics and alerting
• Upper-intermediate or higher level of English

Skills

C# / .NET

ASP.NET Core

SQL Server

Dapper

OAuth2 / JWT

Redis

React / TS

Unit Testing

E2E Testing

Observability

Kubernetes

CI/CD

Monorepo

Tools

Temporal

Telerik Reporting

Kubernetes

Job description

ELEKS Software Engineering and Development Office is looking for a Middle Strong/Senior Full-Stack (.Net+React) Developer in Ukraine or Poland.

ABOUT PROJECT

The project, funded by the US Government, involves the development of a Human Resources System for various ministries in a Middle Eastern country. This initiative aims to improve the efficiency and effectiveness of human resource management across multiple departments.

• 5+ years of professional experience in software development using C# / .NET / .NET Core
• Strong experience with ASP.NET Core Web API and ASP.NET Core MVC
• Production experience with MS SQL Server
• Experience with Dapper
• Hands-on Keycloak (or equivalent) and solid knowledge of OAuth2/OIDC/JWT, cookie security, CORS, CSRF mitigation
• Redis for caching and distributed coordination
• Strong React + TypeScript experience (hooks, Suspense, patterns for large apps)
• Unit & integration testing for .NET and frontend; E2E testing (Cypress/Playwright)
• Logging, distributed tracing (OpenTelemetry), metrics and alerting
• Upper-intermediate or higher level of English
• Nice-to-have:
• Temporal experience (or equivalent): designing idempotent activities, child workflows, error handling and retries
• Deep experience with SQL Server high-availability and performance tooling
• Monorepo tooling and package management (pnpm, Yarn Workspaces, Nx)
• Accessibility, i18n, enterprise security/compliance familiarityPrior experience designing governance for micro-frontends and runtime orchestration
• Experience with Telerik Reporting
• Design and implement backend services using ASP.NET Core Web API and MVC + Razor, applying SOLID principles, dependency injection, and layered architectures
• Build reliable workflows with Temporal
• Use Redis for caching, session storage, pub/sub, and distributed locks
• Lead frontend architecture: React + TypeScript, Module Federation (host/remotes), RsPack bundling/optimization
• Ensure CI/CD, containerization, Kubernetes deployment patterns, and observability (logging/tracing/metrics)
• Drive testing practices (unit, integration, E2E), code reviews, and mentor team members
• Troubleshoot production incidents: performance tuning (SQL and frontend), memory leaks, and scaling issues