Senior Backend Architect, Fintech Platform (Hybrid)

InPost; Warszawa, Kraków; Hybrid; PLN 260,000 - 420,000; Full time

Benefits offered by this job

Diverse environment

International projects

Senior leadership exposure

Training opportunities

Sustainability impact

Flexible hours

B2B contract

Job summary

InPost is building its own fintech platform from the ground up, delivering large-scale, international fintech capabilities. You will define technical direction for payments core, merchant, or consumer areas and mentor engineers.

The role focuses on architecture clarity, standards, and cross-team leadership while evolving an agentic engineering harness in a data-driven way. Hybrid work model with 1 day per week in Warsaw or Cracow office; you’ll collaborate with product strategy and architecture

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 backend focus
• Strong grounding in distributed systems (event sourcing, CQRS, saga, state machines)
• Experience designing APIs at service boundaries (REST, async, event-based)
• Comfort with database trade-offs and cloud eval (AWS/GCP/Azure)
• Experience evolving an agentic engineering harness and instrumenting it
• English proficiency at B2 or above

Responsibilities

• Define and maintain backend architecture for the area (domain boundaries, event contracts, state machines) across multiple teams
• Author ADRs and RFCs to document trade-offs and reasoning
• Evaluate technology trade-offs: DBs, cloud services, message brokers, data models
• Evolve the agentic development harness with instrumentation and data-driven improvements
• Drive org-wide technical change and adoption with stakeholder alignment
• Provide technical input to product strategy; mentor staff-track engineers in reviews and design docs

Skills

Software engineering

Cross-team leadership

Distributed payments

Backend architecture

API design

Cloud services

LLM tooling

Technical writing

English proficiency

Tools

BNPL architecture

PCI DSS/PSD2

Kafka streaming

Agentic/LLM design

Open-source contributions

Job description

InPost is building its own fintech platform from the ground up, delivering large-scale, international fintech capabilities. You will define technical direction for payments core, merchant, or consumer areas and mentor engineers.

The role focuses on architecture clarity, standards, and cross-team leadership while evolving an agentic engineering harness in a data-driven way. Hybrid work model with 1 day per week in Warsaw or Cracow office; you’ll collaborate with product strategy and architecture