Senior Backend Engineer (FinTech)

Location: Hybrid, preferably one day per week in the Warsaw or Cracow office; Kraków / Warsaw

Salary: 110–150 PLN/hour, B2B contract

Company

hirify.global is a software development company building UX, UI, frontend, backend, and mobile projects directly for clients and partners in Poland and abroad.

What you will do

• Design, develop, and maintain distributed backend services for payment authorization, financial ledgers, settlements, and related payment processes.
• Build scalable, secure, reliable APIs and event-driven architectures with integrations between distributed services.
• Own backend solutions across requirements analysis, technical design, implementation, testing, deployment, and production support.
• Design domain events and ensure reliable data exchange between systems.
• Collaborate with engineering and product teams on technical requirements, solution evaluation, and architectural decisions.
• Monitor production systems, investigate incidents, perform root cause analysis, review code, mentor developers, and improve engineering standards.

Requirements

• At least 5 years of commercial backend development experience using one or more of Java, C#/.NET, Rust, or Node.js.
• Practical experience designing, developing, and maintaining distributed systems and event-driven architectures.
• Strong knowledge of consistency models, Saga patterns, idempotency, and the Outbox pattern.
• Experience building and maintaining production-grade backend services and APIs.
• Hands-on experience with CI/CD pipelines, production monitoring, and observability solutions.
• Good knowledge of relational databases, preferably PostgreSQL.
• Experience with automated unit, integration, and contract testing.
• Daily practical use of AI-assisted development tools such as GitHub Copilot, ChatGPT, Claude, or similar solutions.
• Ability to write clean, maintainable, and well-tested code.
• Very good English and Polish.

Culture & Benefits

• Open, honest, respectful working environment with a small team.
• International projects and clients, with opportunities to change products and work on challenging assignments.
• Hybrid work with office attendance preferably one day per week in Warsaw or Cracow.
• Private medical care, sports card, and training courses.
• Opportunities to attend conferences, speak publicly, publish in recognized magazines and online, and work directly with the company board.

Hiring process

• Friendly remote initial interview.
• Remote technical talk.
• Final decision to work together.