InPost FinTech is looking for a Staff Engineer to define the technical direction for our infrastructure, deployment, and operational reliability - across Payments Core, Merchant, and Consumer. You'll multiply team output through infrastructure architecture clarity, engineering standards, and cross-team technical leadership, while owning the evolution of the agentic engineering harness's operational backbone. You'll own the evolution of fundamental infrastructure and platform decisions across the organisation — cloud topology, deployment pipelines, observability, and security posture — ensuring they're sound, defensible, and viable for the long term. You'll report to the Senior Engineering Manager and act as the technical throughline between engineering teams, security, and compliance. → Hybrid working model: preferably 1 day per week in the Warsaw or Cracow office .   Responsibilities: Define and maintain infrastructure architecture across the area: cloud topology, networking, environment strategy, deployment pipelines, and infrastructure-as-code patterns across multiple teams Author Architecture Decision Records (ADRs) and RFCs for infrastructure and platform decisions, facilitating technical decision-making across teams with documented reasoning and clear trade-off analysis Evaluate and decide on fundamental infrastructure trade-offs: cloud service selection, container orchestration, message broker topology, observability stack, and cost optimisation Own the evolution of the agentic engineering harness's infrastructure layer — CI/CD integration, agent sandboxing, tool-execution environments, and guardrails; instrument adoption and friction, and drive improvements with data Drive org-wide technical change: define golden paths and paved roads for deployment and operations, build the case, and see adoption through across teams without direct authority Provide technical input into platform and product strategy; mentor engineers on reliability, security, and operational excellence through design reviews and pairing