Senior Frontend Architect – FinTech Platform, AI-Driven

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

Benefits offered by this job

Diverse international environment

Training opportunities

Flexible hours

B2B contract

Job summary

InPost Pay is building its own fintech platform in Poland. We seek a Staff Engineer to define technical direction for Payments Core, Merchant, or Consumer, multiplying 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 sound, defensible choices for the long term, and act as the

Qualifications

• 8+ years in software engineering with leadership experience.
• 3+ years building customer-facing or merchant-facing products in payments or fintech.
• Expert-level React and TypeScript at scale.
• Design-system and component-architecture experience across multiple teams or products.
• Micro-frontend architecture and client-side state management patterns.
• Performance engineering expertise — Core Web Vitals, bundle optimisation, and rendering-strategy trade-offs (SSR / CSR / ISR).
• Accessibility standards (WCAG) built into architecture, not bolted on.
• API-consumption patterns: REST, GraphQL, async, and event-based contracts.
• Experience designing or evolving an agentic engineering harness for frontend workflows — instrumentation, adoption measurement, iteration.
• Excellent technical writing — ADRs, RFCs, and design docs for multiple audiences.
• English proficiency at B2 or above.
• University degree in Computer Science, IT, or a related field.

Responsibilities

• Define and maintain frontend architecture across the area: component architecture, design-system boundaries, micro-frontend patterns, client-side state management, and performance budgets across multiple teams.
• Author Architecture Decision Records (ADRs) and RFCs for frontend decisions, facilitating technical decision-making across teams with documented reasoning and clear trade-off analysis
• Evaluate and decide on fundamental frontend technology trade-offs: framework and library selection, build tooling, rendering strategy (SSR / CSR / ISR), and accessibility standards
• Own the evolution of the agentic development harness for frontend workflows — instrument it, measure adoption and friction, and drive improvements with data
• Drive org-wide technical change: identify frontend patterns and design-system components 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

Skills

Frontend architecture

Leadership

Architecture authority

English proficiency

Education

University degree in Computer Science

Tools

React

TypeScript

GraphQL

REST

Job description

InPost Pay is building its own fintech platform in Poland. We seek a Staff Engineer to define technical direction for Payments Core, Merchant, or Consumer, multiplying 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 sound, defensible choices for the long term, and act as the