Staff Software Engineer, Backend - Fintech Platform (m/f/n)Full-timeCompany DescriptionInPost is building its own fintech platform from the ground up.It’s a large-scale, international initiative where engineers will have the opportunity to shape the architecture, build core fintech components, and create solutions designed to operate at InPost’s scale.We’re building alean, highly effective engineering organization in Poland, with AI-native engineering at its core. We’re looking for strong engineers who are comfortable with agentic engineering, from experienced professionals building complex systems and engineering tooling to a new generation of engineers who have embraced AI-driven development from the start of their careers.Job DescriptionInPost 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:preferably1 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 teamsAuthor Architecture Decision Records (ADRs) and RFCs, facilitating technical decision-making across teams with documented reasoning and clear trade-off analysisEvaluate and decide on fundamental technology trade-offs: database selection, cloud services, message broker topology, and consistency models appropriate for financial dataOwn the evolution of the agentic development harness - instrument it, measure adoption and friction, and drive improvements with dataDrive org-wide technical change: identify patterns to adopt or deprecate broadly, build the case, and see adoption through across teams without direct authorityProvide technical input into product strategy; mentor Staff-track engineers through design reviews, pairing, and technical writing feedbackQualifications8+ years in software engineering, including 2+ years in cross-team technical leadership or architecture authority3+ years designing distributed payments or fintech systemsHands-on experience with multiple tech stacks and expertise in backendSolid grounding in distributed systems architecture - event sourcing, CQRS, domain events, saga pattern - and state machine / financial entity lifecycle designExperience designing APIs at service-boundary level - REST, async, and event-based contractsComfort 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, iterationWorking knowledge of LLM tool-use patterns and context management in engineering workflowsExcellent technical writing - ADRs, RFCs, and design docs for multiple audiencesEnglish proficiency at B2 or aboveNice to have:2+ years in platform or internal developer tooling engineering1+ years of agentic/LLM system design experience2+ years in BNPL or lending domain architecturePCI DSS / PSD2 architecture compliance experience from the design phaseKafka or equivalent streaming architecture experience at scaleOpen-source contributions or technical publishingPolish language skillsAdditional InformationOpportunity to work in adiverse,international, andcross-functional environment,along with leadingexperts.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 arange of benefitsfor people and investing in providingtraining opportunitiesfor 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 hoursWe offer B2B type of contractBy clicking the link above or any third-party link within this posting, you are leaving this site and going to a third-party website where the third-party website's terms and privacy policy applyI'm interestedI'm interestedPrivacy NoticeImprint
