Principal Software Engineer - 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 DescriptionAs Principal Software Engineer, you'll work directly with the Head of FinTech Engineering and business leadership, translating critical business goals - new product lines, regulatory deadlines, growth targets - into architecture decisions and roadmap input. You'll be the final word on cross-domain technical questions that no single team or Staff Engineer can resolve alone.→Hybrid working model:preferably1 day per week in the Warsaw or Cracow office.Responsibilities:Serve as the single cross-domain technical authority, arbitrating architecture decisions across Payments Core, Merchant, and Consumer platform areasPartner directly with the Head of Engineering and business leadership to turn business strategy into technical roadmap inputAuthor Architecture Decision Records (ADRs) and RFCs for organisation-wide decisions, with reasoning accessible to both engineers and business stakeholdersOwn the agentic engineering harness at an organisational level — design, instrument, and continuously improve AI-assisted engineering workflows based on real production dataIdentify and drive the adoption or deprecation of patterns across all teams, building the case and sequencing change without direct authorityMentor Staff Engineers and Engineering Managers on architecture craft, technical communication, and agentic toolingQualifications10+ years in software engineering, including 5+ years in cross-team technical leadership or architecture authority5+ years designing distributed payments or fintech systems3+ years of agentic/LLM engineering in production — shipped systems, not theoretical patternsDeep knowledge of distributed systems architecture: event sourcing, CQRS, domain events, saga patternExperience designing APIs at an organisational boundary level — REST, async, and event-based contractsStrong grasp of database trade-offs (relational, time-series, document, ledger-style) and cloud architecture evaluation (AWS/GCP/Azure) at organisation scaleHands-on experience with multi-agent orchestration, tool-use patterns, context management, and evaluation harnesses for AI-assisted engineering workflowsExcellent technical writing for mixed audiences — ADRs and RFCs that work for engineers and business leadership alikeEnglish proficiency at B2 or aboveUniversity degree in Computer Science, IT, or a related fieldNice to have:3+ years in platform or internal developer tooling engineering1+ years of agentic/LLM system design experiencePCI DSS / PSD2 architecture compliance experience from the design phaseBNPL or lending domain architecture experienceOpen-source contributions or external technical publishingExperience building or scaling an internal developer platformFormal mentorship of Staff-level or EM-track engineersPolish 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
