Staff Backend Architect, Fintech Payments Platform

InPost; Warszawa, Kraków; Hybrid; PLN 250,000 - 400,000; Full time

Benefits offered by this job

Hybrid work model

Office in Warsaw/Cracow

Job summary

InPost is building its own fintech platform at scale, seeking a Staff Software Engineer (Backend) to define technical direction for Payments Core, Merchant, or Consumer domains. You will drive architecture clarity, set engineering standards, and lead cross-team initiatives in a data-driven, agentic development environment.

The role emphasizes hands-on backend leadership, exposure to distributed systems, API design, and cloud strategy, with a hybrid work model requiring 1 day per week in Warsaw

Qualifications

• 8+ years in software engineering, including leadership or architecture authority
• 3+ years designing distributed payments or fintech systems
• Hands-on with multiple tech stacks and backend
• Strong knowledge of distributed systems (event sourcing, CQRS, saga)
• Experience designing APIs at service-boundary level (REST, async, event-based)
• Cloud evaluation across AWS/GCP/Azure
• Agentic engineering harness instrumentation and adoption measurement
• Proficient English (B2 or above)

Responsibilities

• Define and maintain the backend architecture for the area: domain boundaries, event contracts, state machine patterns, data consistency, and cross-service API design across teams
• Write Architecture Decision Records (ADRs) and RFCs with reasoned trade-offs
• Evaluate technology trade-offs: databases, cloud services, message brokers, and consistency models for finance data
• Evolve the agentic development harness with instrumentation and data-driven improvements
• Drive org-wide technical change and adoption across teams without direct authority
• Provide technical input into product strategy and mentor staff-track engineers through reviews and writing feedback

Skills

Backend

Distributed systems

APIs design

Cloud architecture

LLM tooling

English proficiency

Technical leadership

Agentic engineering

Job description

InPost is building its own fintech platform at scale, seeking a Staff Software Engineer (Backend) to define technical direction for Payments Core, Merchant, or Consumer domains. You will drive architecture clarity, set engineering standards, and lead cross-team initiatives in a data-driven, agentic development environment.

The role emphasizes hands-on backend leadership, exposure to distributed systems, API design, and cloud strategy, with a hybrid work model requiring 1 day per week in Warsaw