Mid-level Front-End Developer eComm agency

🏢 Summary: Senior Frontend Engineer role building enterprise AI interfaces and production Next.js applications with complex state, real-time functionality, and scalable frontend architecture. The position is fully on-site in Warsaw city centre, five days per week, with responsibility for UI quality, performance, accessibility, and enterprise-grade features. 🗂️ Requirements: Work on-site in Warsaw city centre 5 days per week, 5+ years of frontend development experience, 3+ years of React and TypeScript experience, Production Next.js experience, App Router and Server Components expertise, SSR, SSG and CSR knowledge, Complex state-management experience, Real-time and multi-tenant application experience, AI or LLM interface experience, Frontend performance and Core Web Vitals expertise, Accessibility, localization and frontend security knowledge, Experience handling sensitive data, Experience using AI coding assistants 📃 Skills: React, TypeScript, Next.js, SSR, SSG, CSR, LLM, AI, CoreWebVitals, Accessibility, Localization, Security, Claude, Codex, Copilot 🏢 Description: Please note: This role requires working from our office in Warsaw city centre 5 days a week . This is a fully on-site position , and remote or hybrid work is not available . About us We believe that businesses are moving toward AI-powered work, and we are building a platform for this future. Many AI agents cannot handle complex business tasks. We created a platform that organizes company policies, workflows, and business knowledge into one AI data model. This helps AI agents make accurate decisions and deliver reliable results at scale. We already work with well-known enterprise customers such as Glovo, Nespresso, and HelloFresh. Our platform supports thousands of users and processes real production data. Customers trust us with important business knowledge because we provide a secure and reliable solution with SOC2, HIPAA-ready security practices, and strong integrations. Job description We are looking for a Senior Frontend Engineer who enjoys building high-quality user interfaces for enterprise AI products. In this role, you will design and build important frontend features, solve complex UI problems, and improve the user experience over time. You will take ownership of frontend architecture and help build production Next.js applications with complex state management, real-time AI features, and enterprise functionality. The position is based in Warsaw and requires working from the office. Responsibilities Design and build production Next.js applications that support complex state, high traffic, and real-time AI features. Create user interfaces for AI-powered tools, including streaming AI responses, semantic search, knowledge graphs, and AI agents. Build and improve our component library and design system to keep the user experience consistent, accessible, and reusable. Deliver enterprise features such as localization, accessibility, browser compatibility, and security. Monitor applications after release, improve performance, reduce bundle size, track Core Web Vitals, and help systems scale. Maintain high engineering standards through code reviews, testing, and mentoring other developers. Requirements More than 5 years of frontend development experience, including at least 3 years working with React and modern TypeScript. Strong experience building production applications with Next.js, including App Router, Server Components, and understanding SSR, SSG, and CSR. Experience managing complex application state, including real-time updates, optimistic UI, multi-tenant systems, and large amounts of data. Experience building AI or LLM-based interfaces such as chat applications, streaming responses, or semantic search. Strong knowledge of frontend performance and experience improving Core Web Vitals in large applications. Good understanding of accessibility, localization, security, and enterprise application standards. A security-focused approach and experience working with sensitive data. Strong product thinking and the ability to improve user experience without waiting for detailed designs. Experience using AI coding assistants as part of your daily development work. Good written and spoken communication skills and the ability to explain technical decisions clearly. Nice to have Experience with React Flow, Highcharts, or other data visualization libraries. Experience building vector search, RAG, generative AI, or semantic search interfaces. Basic knowledge of Node.js or Python to understand backend code and APIs. Experience contributing to design systems or open-source UI libraries. What we offer B2B contract and company stock options. MacBook Pro. Modern technology stack and the opportunity to contribute to open-source projects. An AI-focused development environment with tools such as Claude Code, OpenAI Codex, and GitHub Copilot. Our values Our leadership team has strong experience in AI, knowledge management, and enterprise SaaS. We have received more than $60 million in funding and have been recognized by Gartner as a Cool Vendor. Our work is guided by these values: Quality – We care about excellent work and high standards in everything we build. Momentum – We take initiative, share ideas, and keep moving forward. Accountability – We take responsibility for our work and give honest, respectful feedback. Hard work – We believe success comes from teamwork, dedication, and consistent effort. Learning agility – We stay curious, learn from mistakes, and continue improving. Adapt and thrive – We welcome change and see challenges as opportunities to grow. Win together – We work as one team, communicate openly, and support our shared goals.

🏢 Summary: Oferta dla doświadczonego Frontend Software Engineera odpowiedzialnego za rozwój, utrzymanie i architekturę nowoczesnych aplikacji webowych wspierających komunikację z klientami. Rola obejmuje pełny cykl życia produktu — od analizy potrzeb biznesowych po wdrożenie, monitoring i optymalizację rozwiązań produkcyjnych. 🗂️ Requirements: Minimum 5 lat doświadczenia w tworzeniu aplikacji webowych, Bardzo dobra znajomość JavaScript i TypeScript, Doświadczenie z React, Angular lub Vue, Doświadczenie w projektowaniu skalowalnej architektury frontendowej, Znajomość HTML5, CSS3 i responsywnego projektowania, Doświadczenie z Git, Znajomość REST API, WebSocket i gRPC, Doświadczenie z wdrożeniami, monitoringiem i utrzymaniem aplikacji produkcyjnych, Umiejętność analizy systemów, przepływu danych i problemów wydajnościowych, Umiejętność przekładania wymagań biznesowych na rozwiązania techniczne 📃 Skills: JavaScript, TypeScript, React, Angular, Vue, HTML5, CSS3, RWD, Git, REST, WebSocket, gRPC 🏢 Description: Poszukujemy doświadczonego Frontend Software Engineera  który dołączy do naszego zespołu i będzie odpowiedzialny za rozwój oraz utrzymanie nowoczesnych aplikacji webowych. Szukamy osoby, która łączy umiejętności techniczne z rozumieniem potrzeb biznesowych i potrafi dostarczać wysokiej jakości rozwiązania. Dołączysz do zespołu obsługującego komunikacje z klientami. Nasze wymagania: Minimum 5 lat doświadczenia w tworzeniu aplikacji webowych Bardzo dobra znajomość JavaScript/TypeScript Doświadczenie w pracy z nowoczesnymi frameworkami frontendowymi (np. React, Angular lub Vue) Doświadczenie w projektowaniu skalowalnych architektur frontendowych Znajomość HTML5, CSS3 oraz zasad responsywnego projektowania (RWD) Doświadczenie w pracy z systemami kontroli wersji (Git) Znajomość komunikacji z backendem (REST API, Websocket, gRPC) Umiejętność pisania czytelnego kodu produkcyjnego Doświadczenie w pracy z aplikacjami w środowisku produkcyjnym (wdrożenia, monitoring, utrzymanie) Tego oczekujemy: Samodzielności w realizacji zadań, od analizy po wdrożenie i utrzymanie Dbałości o jakość, wydajność i dostępność aplikacji Umiejętności diagnozowania i rozwiązywania problemów (np. wydajnościowych) Dbałości o przejrzystość i modularność kodu Umiejętności analizy systemów oraz przepływu danych między komponentami Rozumienia zależności pomiędzy elementami systemu Umiejętności przekładania wymagań biznesowych na rozwiązania techniczne Dobrej organizacji pracy i umiejętności priorytetyzacji zadań Gotowości do dzielenia się wiedzą i wspierania zespołu Aktywnego udziału w rozwoju architektury aplikacji Efektywnej komunikacji i pracy zespołowej Zaangażowania w pełen cykl życia produktu Co oferujemy Pracę w świetnym zespole, którego siłą jest pasja i współpraca, Pracę hybrydową (3+2) Pracę pod skrzydłami przypisanego partnera w procesie onboardingu, Nowoczesne biuro w Katowicach z konsolą PS5 i piłkarzykami, Bezpłatne zajęcia z języka angielskiego, Kartę MedicoverSport, ubezpieczenie na życie i opiekę medyczną, Bezpłatne bilety na mecze reprezentacji Polski, Urozmaicone śniadania i obiady w dobrej cenie w naszym Bistro, Ścieżkę rozwoju osobistego oraz budżet na kursy i szkolenia, Codziennie świeże owoce, dobra kawa i zdrowe przekąski, Poszanowanie równowagi między życiem zawodowym a prywatnym.

🏢 Summary: Senior frontend/full-stack developer role focused on building resilient, enterprise-ready product features for a sports and health platform. The position involves React, TypeScript, Next.js, REST APIs, PostgreSQL, and close remote collaboration, with a hybrid schedule in Kraków. 🗂️ Requirements: 5+ years of professional development experience, Production experience with React and TypeScript, Production experience with Next.js App Router, REST API and data-validation experience, PostgreSQL and ORM experience, Ability to follow architectural documentation and team conventions, Git, code review, and Jira experience, Independent problem analysis and written feature planning/ADRs, Careful handling of healthcare data, schemas, and access logic, Strong written technical communication, Remote and asynchronous collaboration skills, Advanced English, Ability to complete a technical coding test without assistance, Availability to start within one month, Ability to work from the Kraków office 3 days per week 📃 Skills: React, TypeScript, Next.js, REST, Zod, PostgreSQL, Drizzle, Prisma, TypeORM, Git, Jira, Claude 🏢 Description: About the role You will be assisting in the understanding of, architecture, implementation, and quality of core Product Roadmap items intended to drive the project for our client forward. The ability to work with the team and collaborate is essential. You will have an immediate impact and be an early figure in the company today to help drive our growth. You will focus on solidifying our product and making it resilient as well as learning how to roll out enterprise-ready features. Required skills /knowledge and production experience/ React + TypeScript Next.js (App Router) — routing, server/client components, API routes REST API, data validation (example - Zod) PostgreSQL and ORM (Drizzle or similar — Prisma/TypeORM) Work according to the team's conventions and architectural documentation(ADR-y) — the ability to read and follow established standards before writing code Git, code review, ticketing (Jira) Coding with Claude /on daily basis/ Minimum of 5 years of professional experience developer with hands-on skills. Communication and other required skills Git, code review, ticketing (Jira) Independence in problem analysis and a willingness to plan before implementation (the project requires a written plan/ADR before each new feature). Accuracy and attention to detail—working with healthcare data requires caution when changing the schema and access logic. Good written communication—documentation, PR descriptions, tickets, and code review comments. Comfortable working in a distributed/remote team and asynchronous communication. Openness to feedback and a willingness to propose simpler solutions instead of over-engineering (the project explicitly avoids over-engineering). Sense of responsibility (ownership) for the delivered functionalities from design to implementation. Advanced English - hard must - daily calls with native CTO or CEO(weekly) . Ability to discuss technical problems, describe concept, architecture or planned feature. There's going to be (online or onsite in Krakow) technical coding test (without extra help) and English general and/or tech conversation. Awesome but not a must: Supabase (Auth, RLS, Postgres) AWS: S3, SQS, Lambda - designing or integrating with data processing pipelines (multipart upload, task queuing, workers) Terraform / IaC - ability to read infrastructure definitions (no need to write them yourself) Working with video / media data / large-volume files (e.g., recording processing, LiDAR, wearable data) Designing permission systems (RBAC) for multiple user roles OpenAPI / API contracts, documenting endpoints Experience in health, sports, telemedicine, or other sensitive/regulated data Application observability (Sentry, PostHog, or similar) Real-time integrations (chat/video SDKs like CometChat, WebSocket) Our benefits: Awesome and highly intense product /sports and health/ Private medical care and multisport card Flexible working hours (you can start between 8:00 -10:00 a.m.) Your choice of computer: Mac OS/Linux/Windows Upskilling budget English discussion classes every week Parking spot few mins from office Employee recommendation program. 🟢 The office is based in Kraków. We work 3 days from the office a week. 🟢 The process consists of 2 stages. We recruit remotely :) Ideal candidate should start within a month (no longer).