Staff Software Engineer, Backend - Fintech Platform (m/f/n)

Location: Hybrid, preferably 1 day per week in the Warsaw or Cracow office, Poland

Company

hirify.global is part of InPost Group, a European out-of-home delivery and e-commerce company operating intelligent parcel locker networks across several countries.

What you will do

• Define and maintain backend architecture for the Payments Core, Merchant, or Consumer platform area.
• Design domain boundaries, event contracts, state-machine patterns, data-consistency models, and cross-service APIs across multiple teams.
• Author ADRs, RFCs, and design documentation while facilitating technical decisions and trade-off analysis.
• Evaluate databases, cloud services, message-broker topologies, and consistency models for financial data.
• Evolve the agentic development harness through instrumentation, adoption measurement, and data-driven improvements.
• Drive organization-wide technical change, contribute to product strategy, and mentor Staff-track engineers.

Requirements

• 8+ years of software engineering experience, including 2+ years of cross-team technical leadership or architecture authority.
• 3+ years designing distributed payments or fintech systems.
• Hands-on experience with multiple technology stacks and strong backend expertise.
• Experience with distributed systems architecture, including event sourcing, CQRS, domain events, saga patterns, and financial entity lifecycles.
• Experience designing REST, asynchronous, and event-based service-boundary APIs, plus evaluating databases and cloud architectures.
• English proficiency at B2 or above.

Nice to have

• Platform or internal developer tooling engineering experience.
• Agentic or LLM system design experience and knowledge of LLM tool-use patterns.
• BNPL or lending domain architecture experience.
• PCI DSS or PSD2 architecture compliance experience.
• Kafka or equivalent streaming architecture experience, open-source contributions, technical publishing, or Polish language skills.

Culture & Benefits

• Diverse, international, and cross-functional environment with experienced specialists.
• Exposure to e-commerce and logistics through collaboration with senior leaders and their teams.
• Training and professional development opportunities.
• Flexible working hours and a hybrid working model.
• B2B contract available.