Staff Software Engineer, Backend - Fintech Engineering (m/f/n)
Read straight from InPost's careers page, verified 1d ago.Seekless can tailor your résumé to it.
Seekless can write your résumé for this posting first.
Before you apply
LocationWarsaw/Cracow, pl
Work modehybrid
Typefull-time
SeniorityLead
Experience8+ yrs
DepartmentEngineering
Company size1,001–5,000 people
PostedOct 29, 2026 · 6d ago
Verified live1d ago
At a glanceSummarised by Seekless from the posting.
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
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
Skills
AWS
GCP
Azure
Kafka
REST
event-based contracts
Benefits
Training opportunities
Flexible hours
Remote stipend
Company Description
InPost 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 a lean, 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 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
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
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