Staff Backend Engineer (Payments & Fintech)

Location: Hybrid, with 1 day per week in the office in Kraków or Warsaw, Poland.

Salary: 150–170 PLN/hour on a B2B contract.

Company

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

What you will do

• Design and evolve backend architecture across multiple teams, including domain boundaries, service communication, and scalable system design.
• Define distributed-system principles covering event-driven communication, state management, data consistency, APIs, and financial data processing.
• Lead technical discussions and document decisions through ADRs, RFCs, and system design proposals.
• Evaluate databases, cloud infrastructure, messaging systems, and other technology options.
• Develop and optimise AI-powered, agentic engineering workflows, including adoption monitoring and performance measurement.
• Mentor experienced engineers and drive cross-team architectural improvements aligned with product and business strategy.

Requirements

• At least 8 years of professional software engineering experience, including at least 2 years in technical leadership or architecture responsibilities across multiple teams.
• At least 3 years of experience designing distributed systems in the payments or fintech sector.
• Strong backend engineering expertise and practical experience with different technology stacks.
• In-depth knowledge of distributed systems and Event Sourcing, CQRS, Domain Events, and Saga patterns.
• Experience designing state machines and managing the lifecycle of financial entities.
• Strong API architecture knowledge, including REST APIs, asynchronous communication, and event-driven integration contracts.
• Ability to evaluate relational, document, time-series, and ledger-oriented databases.
• Experience assessing cloud architectures and services in AWS, Google Cloud, or Microsoft Azure.
• Experience designing or improving agentic engineering environments, including instrumentation, adoption tracking, iterative optimisation, LLM tool-use patterns, context management, and AI-assisted development workflows.
• Experience preparing ADRs, RFCs, and system design documentation; excellent written and verbal communication; ability to work in a global matrix organisation; and strong leadership skills.
• Very good English and Polish.

Culture & Benefits

• Open, honest, problem-solving environment with a small team.
• International working environment and projects.
• Private medical care and sports card.
• Training courses and opportunities to attend conferences, speak publicly, and publish professional content.
• Hybrid work arrangement with one office day per week in Kraków or Warsaw.

Hiring process

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