Remote Senior Full-Stack Developer (React/.NET)

Software Mind; Warszawa; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Remote cooperation

International projects

Travel opportunities

Non-corporate atmosphere

Language classes

Knowledge-sharing

Private healthcare

Multisport card

Job summary

Software Mind in Warsaw, Poland, is looking for an experienced software engineer to own C#/.NET services and REST APIs within a PCI DSS-compliant payments risk platform.

You'll design APIs with front-end contracts, implement secure data access, and contribute to a React/TypeScript front end. Daily use of AI coding tools and strong CI/CD practices are expected in a collaborative, remote-friendly team.

Qualifications

• 7+ years of commercial software development, including 5+ years of production-grade C#/.NET (ASP.NET Core, async, DI, EF Core or Dapper)
• Strong API design: REST conventions, OpenAPI contracts, versioning and evolving APIs without breaking consumers
• Relational database and distributed-systems skills: schema design, query tuning, transactional correctness, idempotency, failure handling
• Working proficiency in React and TypeScript – able to build features end to end and review frontend code
• Daily, hands-on use of agentic AI coding tools (Claude Code, Cursor, Copilot Workspace, Codex or similar) and a track record of shipping AI-accelerated code that holds up in production – you’ll demo your workflow live
• Containers: Docker (multi-stage builds, hardening), Docker Compose and Kubernetes (AKS preferred)
• Testing discipline: xUnit or NUnit, integration testing with real dependencies (e.g. Testcontainers) and contract testing
• Git, CI/CD (Azure DevOps, GitHub Actions or similar) and autonomy in an existing codebase

Responsibilities

• Design, build and ship production C#/.NET services and REST APIs serving high-volume payment and risk data under PCI DSS constraints
• Own API contracts with the front end: typed OpenAPI contracts, versioning and backward-compatible change
• Write efficient data access against the operational database and Microsoft Fabric Gold-layer risk tables at analyst-scale volumes
• Implement security-critical concerns: authentication, authorization, audit logging and PCI-safe handling of tokenized card data
• Contribute to the React and TypeScript front end – building features end to end, reviewing and pairing
• Use Claude Code or an equivalent agentic coding tool as your primary accelerator, backed by unit, integration and contract tests, while owning the quality of every line merged
• Maintain Dockerfiles and Compose configurations, support deployments to AKS and contribute to Azure DevOps CI/CD
• Implement against the target architecture set by the client’s architecture group, raise risks early and hand off work the internal team can own

Skills

C#/.NET

API design

React

TypeScript

Docker

Kubernetes

CI/CD

AI coding tools

Tools

OpenAPI

EF Core

Dapper

Testcontainers

Azure DevOps

GitHub Actions

AKS

Job description

Software Mind in Warsaw, Poland, is looking for an experienced software engineer to own C#/.NET services and REST APIs within a PCI DSS-compliant payments risk platform.

You'll design APIs with front-end contracts, implement secure data access, and contribute to a React/TypeScript front end. Daily use of AI coding tools and strong CI/CD practices are expected in a collaborative, remote-friendly team.