Senior Frontend Software Engineer (m/f/d)
Company Description:InPost has revolutionised e-commerce parcel delivery in Poland and is now one of Europe’s leading OOH e-commerce enablement platforms. Founded in 1999 by Rafał Brzoska, InPost provides delivery services through our network of almost 60,000 Automated Parcel Machines (APMs) and almost 35,000 pick-up drop-off points (PUDO) in nine countries across Europe, as well as to-door courier and fulfilment services to e-commerce merchants. InPost’s lockers provide consumers with a cheaper and more flexible, convenient, environmentally friendly and contactless delivery option. Job Description:We're building a platform — a unified system used organization-wide to manage and serve content for both web and mobile apps across all markets where InPost operates.The platform gives content editors a visual interface to build and publish pages. Behind the scenes, it's a TypeScript monorepo with a Next.js + PayloadCMS admin panel, an Astro SSR web renderer, and a custom shared design system.
We are looking for a seasoned engineer (typically 4+ years building production frontend applications) who understands the complexities of working in a large, international organization. You aren't just a coder; you are a problem solver who understands how technical decisions impact global scalability, multi-market rollouts, and localization.
You'll work at the intersection of product, design, and engineering. We expect you to bring experience from other mature organizations, challenge our ideas, and help us navigate the challenges of a multi-language, multi-region platform.
We also believe AI is reshaping frontend development. We want someone who has already adapted—using AI tools naturally—and can help the team raise the bar.Your ResponsibilitiesDevelop new features focusing on architecture, scalability, and internationalization standardsTake ownership of your solutions — you own the outcome and quality of what you buildDrive the evolution of our shared design system to support multiple brands and marketsOwn accessibility (a11y) as a first-class concern across all our international sitesBuild complex UI features: block-based editor interactions, undo/redo, and previewsExperiment with and integrate LLM-based tools into our products and workflowsDrive AI adoption within the team — help establish best practicesWork with strict TypeScript to design safe, ergonomic APIsMaintain and extend our E2E test suite (Playwright) to ensure stability across regionsMentor junior engineers and foster a culture of technical excellenceParticipate in architectural decision-making — we use lightweight RFCs and collective ownership to align on technical direction
Qualifications:Must HaveProven experience in an international organization or working on large-scale products serving multiple marketsDeep knowledge of HTML and CSS (cascade, specificity, layout systems)Strong React skills — combined with Engineering thinking: you are a software engineer, not just a React developerExperience with Next.js, Astro, or similar modern frameworksStrong TypeScript (strict mode, generics, conditional types)Experience with multi-language / multi-site architectures (i18n, l10n complexities)Solid web accessibility expertise (WCAG 2.1/2.2)Experience designing and contributing to design systemsUnderstanding of SSR and hydration trade-offsExperience mentoring or onboarding less experienced engineersPractical experience with AI tools in developmentAbility to work with cross-functional teams and influence stakeholdersNice to HaveFamiliarity with PayloadCMS or another headless CMSExperience working in monorepos and complex build pipelinesExperience building rich text editors (Lexical, TipTap, etc.)Experience integrating LLM APIs into user-facing featuresKnowledge of performance measurement (Core Web Vitals)Interest in design token systems and style pipelines
Additional Information:Why Join InPost?Opportunity to work in a diverse, international and cross-functional environment, along with leading experts. Fulfilling careers with a range of benefits for employees and invests in providing training opportunities for their development. Your impact will be visible instantly and you will be making a difference in our users livesReal ownership — you'll make architectural calls that impact multiple markets
A platform with genuine complexity worth solving (international scale, complex CMS)
Space to experiment with AI tooling and bring new ideas into production
A mature, experienced team that values technical depth
We are looking for a seasoned engineer (typically 4+ years building production frontend applications) who understands the complexities of working in a large, international organization. You aren't just a coder; you are a problem solver who understands how technical decisions impact global scalability, multi-market rollouts, and localization.
You'll work at the intersection of product, design, and engineering. We expect you to bring experience from other mature organizations, challenge our ideas, and help us navigate the challenges of a multi-language, multi-region platform.
We also believe AI is reshaping frontend development. We want someone who has already adapted—using AI tools naturally—and can help the team raise the bar.Your ResponsibilitiesDevelop new features focusing on architecture, scalability, and internationalization standardsTake ownership of your solutions — you own the outcome and quality of what you buildDrive the evolution of our shared design system to support multiple brands and marketsOwn accessibility (a11y) as a first-class concern across all our international sitesBuild complex UI features: block-based editor interactions, undo/redo, and previewsExperiment with and integrate LLM-based tools into our products and workflowsDrive AI adoption within the team — help establish best practicesWork with strict TypeScript to design safe, ergonomic APIsMaintain and extend our E2E test suite (Playwright) to ensure stability across regionsMentor junior engineers and foster a culture of technical excellenceParticipate in architectural decision-making — we use lightweight RFCs and collective ownership to align on technical direction
Qualifications:Must HaveProven experience in an international organization or working on large-scale products serving multiple marketsDeep knowledge of HTML and CSS (cascade, specificity, layout systems)Strong React skills — combined with Engineering thinking: you are a software engineer, not just a React developerExperience with Next.js, Astro, or similar modern frameworksStrong TypeScript (strict mode, generics, conditional types)Experience with multi-language / multi-site architectures (i18n, l10n complexities)Solid web accessibility expertise (WCAG 2.1/2.2)Experience designing and contributing to design systemsUnderstanding of SSR and hydration trade-offsExperience mentoring or onboarding less experienced engineersPractical experience with AI tools in developmentAbility to work with cross-functional teams and influence stakeholdersNice to HaveFamiliarity with PayloadCMS or another headless CMSExperience working in monorepos and complex build pipelinesExperience building rich text editors (Lexical, TipTap, etc.)Experience integrating LLM APIs into user-facing featuresKnowledge of performance measurement (Core Web Vitals)Interest in design token systems and style pipelines
Additional Information:Why Join InPost?Opportunity to work in a diverse, international and cross-functional environment, along with leading experts. Fulfilling careers with a range of benefits for employees and invests in providing training opportunities for their development. Your impact will be visible instantly and you will be making a difference in our users livesReal ownership — you'll make architectural calls that impact multiple markets
A platform with genuine complexity worth solving (international scale, complex CMS)
Space to experiment with AI tooling and bring new ideas into production
A mature, experienced team that values technical depth