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

InPost; Warszawa, Kraków; Hybride; PLN 180 000 - 260 000; Plein temps

Avantages offerts par ce poste

Training opportunities

Range of benefits

Flexible hours

Résumé du poste

InPost Pay is building its own fintech platform from the ground up. We are forming a lean, highly effective engineering organization in Poland with AI-native engineering at its core.

We seek a Staff Software Engineer to define frontend direction for Payments Core, Merchant, or Consumer, ensuring architecture clarity and clear trade-offs across teams. You will own fundamental technology decisions, mentor staff-track engineers, and partner with product strategy within a data-driven,

Qualifications

• 8+ years in software engineering with leadership/architecture experience.

Responsabilités

• Define frontend architecture across the area: components, design-system boundaries, micro-frontend patterns, state management, and performance budgets.
• Write ADRs and RFCs for frontend decisions to document reasoning and trade-offs.
• Evaluate frontend tech choices: framework/library, build tooling, rendering strategies, accessibility at scale.
• Develop and evolve agentic frontend development harness with instrumentation and data-driven improvements.
• Drive cross-team technical change by identifying patterns and components to adopt or deprecate.
• Provide input into product strategy and mentor staff-track engineers through design reviews and reviews of technical writings.

Connaissances

React

TypeScript

Design-system

Micro-frontend

Performance optimization

WCAG accessibility

REST GraphQL

Agentic engineering

Technical writing

Formation

University degree in Computer Science or related field

Outils

Frontend tooling

ADR RFC documentation

Description du poste

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

• Full-time

InPost Pay 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.

InPost's FinTech Platform team 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:

• 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

Requirements:

• 8+ years in software engineering, including 2+ years in cross-team technical leadership or architecture authority
• 3+ years building customer-facing or merchant-facing products in payments or fintech
• Expert-level experience with a modern frontend framework (e.g. 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

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 product experience
• Mobile app architecture (e.g. React Native) alongside web
• Real-time UI patterns (WebSockets, streaming updates)
• Internationalisation / localisation architecture at scale
• Open-source contributions or technical publishing

• Opportunity to work in adiverse,international, andcross-functional environment,along with leadingexperts.
• 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 arange of benefitsfor people and investing in providingtraining opportunitiesfor 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