About the role
Job Description
InPost Pay is looking for a Staff Engineer to define the technical direction for one of our platform areas - Payments Core, Merchant, or Consumer. You'll multiply team output through architecture clarity, engineering standards, and cross-team technical leadership, while helping evolve our agentic engineering harness in a data-driven way.
You'll own the evolution of fundamental technology decisions across your area - ensuring they're sound, defensible, and viable for the long term - and act as the technical throughline between engineering teams, product strategy, and the organisation's wider architecture standards.
→ Hybrid working model: preferably 1 day per week in the Warsaw or Cracow office.
Responsibilities:
* Define and maintain the backend technical architecture for your area: domain boundaries, event contracts, state machine patterns, data consistency models, and cross-service API design across multiple teams * Author Architecture Decision Records (ADRs) and RFCs, facilitating technical decision-making across teams with documented reasoning and clear trade-off analysis * Evaluate and decide on fundamental technology trade-offs: database selection, cloud services, message broker topology, and consistency models appropriate for financial data * Own the evolution of the agentic development harness - instrument it, measure adoption and friction, and drive improvements with data * Drive org-wide technical change: identify patterns to adopt or deprecate broadly, build the case, and see adoption through across teams without direct authority * Provide technical input into product strategy; mentor Staff-track engineers through design reviews, pairing, and technical writing feedback
Qualifications
* 8+ years in software engineering, including 2+ years in cross-team technical leadership or architecture authority * 3+ years designing distributed payments or fintech systems * Hands-on experience with multiple tech stacks and expertise in backend * Solid grounding in distributed systems architecture - event sourcing, CQRS, domain events, saga pattern - and state machine / financial entity lifecycle design * Experience designing APIs at service-boundary level - REST, async, and event-based contracts * Comfort with database trade-off reasoning (relational, time-series, document, ledger-style) and cloud architecture evaluation (AWS/GCP/Azure) * Experience designing or evolving an agentic engineering harness — instrumentation, adoption measurement, iteration * Working knowledge of LLM tool-use patterns and context management in engineering workflows * Excellent technical writing - ADRs, RFCs, and design docs for multiple audiences * English proficiency at B2 or above
Nice to have:
* 2+ years in platform or internal developer tooling engineering * 1+ years of agentic/LLM system design experience * 2+ years in BNPL or lending domain architecture * PCI DSS / PSD2 architecture compliance experience from the design phase * Kafka or equivalent streaming architecture experience at scale * Open-source contributions or technical publishing * Polish language skills
Additional Information
* Opportunity to work in a diverse, international, and cross-functional environment, along with leading experts. * You work and learn from a senior leader and their leadership team, expanding your experience and exposure in the e-commerce and logistics industries. * InPost is a growing company that offers its people an increasing number of opportunities in several locations in Europe. * Fulfilling careers with a range of benefits for people and investing in providing training opportunities for their development. * You will feel a part of the InPost community that makes an impact on sustainability, convenient deliveries, and the circular economy every day. * Excellent working environment and flexible hours * We offer B2B type of contract