InPost

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

InPost
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11 hours ago
Warsaw, PolandStaff+

Responsibilities

  • Define and maintain backend technical architecture for Payments Core, Merchant, or Consumer platform areas across multiple teams.
  • Author ADRs, RFCs, and design documentation while facilitating technical decisions and trade-off analysis.
  • Evaluate database, cloud service, message broker, API, and consistency-model choices for financial systems.
  • Own instrumentation, adoption measurement, and improvement of the agentic development harness.
  • Drive organization-wide adoption or deprecation of technical patterns without direct authority.
  • Provide technical input into product strategy and mentor Staff-track engineers through design reviews, pairing, and technical writing feedback.

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 and strong backend expertise across multiple technology stacks.
  • Experience with distributed systems architecture, including event sourcing, CQRS, domain events, saga patterns, and financial entity lifecycle design.
  • Experience designing REST, asynchronous, and event-based APIs at service boundaries.
  • Experience evaluating relational, time-series, document, and ledger-style databases and AWS, GCP, or Azure cloud architectures.
  • Experience designing or evolving an agentic engineering harness, including instrumentation, adoption measurement, and iteration.
  • Working knowledge of LLM tool-use patterns and context management in engineering workflows.
  • Excellent technical writing skills for ADRs, RFCs, and design documents, plus English proficiency at B2 or above.
  • Preferred qualifications include platform or internal developer tooling experience, agentic or LLM system design, BNPL or lending architecture, PCI DSS or PSD2 compliance architecture, Kafka or equivalent streaming architecture at scale, open-source contributions, technical publishing, and Polish language skills.

Benefits

  • Hybrid working model, preferably one day per week in the Warsaw or Cracow office.
  • B2B type of contract.
  • Flexible hours and an excellent working environment.
  • International, diverse, and cross-functional environment with exposure to senior leadership, e-commerce, and logistics.
  • Training and development opportunities and career growth across several European locations.
  • Opportunity to contribute to sustainability, convenient deliveries, and the circular economy.
InPost

About InPost

5,001-10,000 employees

InPost is a public logistics company listed on Euronext Amsterdam that builds and operates an out-of-home parcel delivery network for e-commerce. Its network includes more than 50,000 out-of-home pick-up points, including over 27,000 parcel lockers, plus to-door courier and fulfillment services for online merchants across Poland, the UK, Italy, Iberia, France and Benelux. Headquartered in Luxembourg, it acquired French operator Mondial Relay in 2021.

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