Senior Frontend Developer

🏢 Summary: Frontend role focused on building and enhancing secure API integrations with external brokers using React and TypeScript in a hybrid B2B model. The position involves developing reusable UI components, collaborating with backend teams on financial API integrations, and contributing to code quality in a Scrum environment. 🗂️ Requirements: Experience in frontend development, Proficiency in React, Proficiency in TypeScript, Knowledge of REST APIs, Knowledge of JSON, Ability to work in Scrum teams, Experience with performance standards, Experience with accessibility standards, Collaboration skills, Communication skills 📃 Skills: React, TypeScript, REST, JSON, Scrum, Node.js, CI/CD, Postman 🏢 Description: General info: - Model of work: hybrid, 1x per week work from office in Warsaw - Type of contract: B2B contract - Rate: 130 PLN net + VAT / hour Introduction & Summary: Role requires expertise in frontend development to create and enhance API integrations with external brokers. Ideal candidate should have a strong proficiency in React and TypeScript. You will contribute to building user-friendly and secure interfaces, ensuring smooth integration with partners while adhering to high-quality standards. Main Responsibilities: - Develop reusable, high-quality React + TypeScript components for plugins and internal tools - Work closely with backend engineers to integrate with payment and financial APIs - Ensure performance, accessibility, and responsiveness on partner websites - Contribute to code quality through testing and code reviews - Participate in two-week sprints using Scrum methodology - Collaborate with the Product Owner for requirement clarification - Engage in continuous learning and knowledge sharing within the team Key Requirements: - Proven experience in frontend development - Proficiency in React and TypeScript - Familiarity with REST APIs and JSON - Ability to work in Scrum teams - Experience with performance and accessibility standards - Good collaboration and communication skills Nice to Have: - Knowledge of Node.js - Experience with CI/CD pipelines - Familiarity with tools like Postman - Experience in building embeddable widgets/plugins - Understanding of security and compliance in financial products

🏢 Summary: Offer for an experienced React FrontEnd Developer to design and build responsive, high-performance user interfaces in a hybrid model in Warsaw. The role focuses on developing modern web applications using React and related technologies, with strong emphasis on testing, accessibility, and performance optimization. The position involves close collaboration with cross-functional teams to deliver robust, user-centric digital products. 🗂️ Requirements: 6+ years of experience in JavaScript development, 6+ years of experience in TypeScript development, Commercial experience with React.js, Experience with Redux, Hands-on experience with HTML5, Hands-on experience with CSS3, Ability to write cross-browser compatible code, Understanding of object-oriented programming concepts and design patterns, Knowledge of functional programming paradigms, Understanding of asynchronous programming, Experience with TDD, Experience with continuous integration, Knowledge of Git and branch management, Experience with front-end debugging tools, Experience working in Agile methodology 📃 Skills: JavaScript, TypeScript, React, Redux, Next.js, HTML5, CSS3, Git, TDD, CI, OOP, FP 🏢 Description: React FrontEnd Developer IT · Warsaw (City Center) · Hybrid About the Client Our Client is a fast-growing, international technology company that provides innovative digital solutions for the global market. They are currently expanding and developing their R&D center in Warsaw. They are a leader in AI-powered enterprise operations, delivering digital solutions and consulting services that drive value and transform businesses. They specialize in using advanced technology to streamline operations, improve efficiency, and unlock new revenue opportunities, particularly within the private capital markets. With over a decade of experience supporting high-growth companies, they bring deep domain expertise and a proven ability to turn technology into a strategic advantage. Role Overview We are seeking a skilled React FrontEnd Developer to design and develop responsive user interfaces. In this role, you will collaborate with cross-functional teams to deliver robust, user-centric solutions while driving best practices in testing, accessibility, and performance optimization. Key Responsibilities UI Development: Designing and developing responsive user interfaces using React Testing & Integration: Implementing and maintaining TDD in applications and continuous integration. Driving best practices in testing, accessibility, and performance optimization. Collaboration: Collaborating with a cross-functional team of project managers, project analysts, and sales staff to deliver high-quality, interactive products on time. Collaborating cross-functionally with design, backend, QA, and product teams to deliver robust and user-centric solutions. Requirements & Qualifications Experience & Education: 6+ years of experience in JavaScript and TypeScript development. A Bachelor's degree in Computer Science or equivalent is preferred. Core Tech Stack: Must know a modern front-end JS framework, such as React.js + Redux; Next.js is a bonus. Hands-on experience with HTML5, CSS3. Proficiency in writing cross-browser compatible code. Programming Paradigms: Should understand OO concepts and design patterns, and their application to JavaScript development. Knows functional programming paradigms. Understands asynchronous programming paradigms and best practices. Tools & Debugging: Git and branch management knowledge. Experience debugging front-end problems and a knowledge of front-end debugging tools. Familiarity with custom package creation and integration. Soft Skills & Methodology: Experience with Agile methodologies and development practices. Good communication skills and good organization skills. Ability to work under pressure and deliver against tight deadlines. What Is Offered Compensation: Monthly compensation up to $4,800 USD . Contract Type: B2B contract via Optiveum. Work Model: Hybrid (3 days working from the office located in the center of Warsaw, 2 days working from home). Stability: Long-term cooperation with a stable, international organization.

🏢 Summary: B2B contract for a Senior Performance Test Engineer to design, execute, and integrate advanced load and stress testing for a production-scale gaming platform, with remote work until June 2026 and then onsite in Warsaw. The role focuses on identifying performance bottlenecks, building reusable test scripts, and embedding performance testing into CI/CD pipelines. The position offers up to 5900 EUR net with a two-step online recruitment process. 🗂️ Requirements: 5+ years of hands-on performance and load testing experience, Strong practical experience with k6 or Gatling or JMeter or Locust, Experience building complex performance test scripts from scratch, Understanding of backend architecture and databases, Ability to analyze metrics from Grafana or Datadog or New Relic, Knowledge of HTTP and WebSockets, Experience testing APIs under load including authentication and concurrent sessions, Experience integrating performance tests into CI/CD pipelines, Proficiency with Git, Fluent English at B2+ level 📃 Skills: k6, Gatling, JMeter, Locust, Grafana, Datadog, NewRelic, WebSocket, HTTP, CI/CD, Git, APIs, Databases 🏢 Description: Employer: International cassino games studio Location: until june 2026 remote, then 5 days from the office in Warsaw Salary: up to 5900 EUR net Cooperation model: B2B Start date: ASAP Recruitment process: 2 online interviews and recruitment task Technology stack: k6 or Gatling or JMeter or or Locus, Grafana or Datadog or New Relic, WebSocket Your role is to: -> Design and execute load, stress, spike, and soak tests against critical platform flows; -> Analyze results and pinpoint exactly where and why performance degrades — not just that it does; -> Work closely with backend engineers to understand system architecture and target the right bottlenecks; -> Build and maintain performance test scripts that are reusable, version controlled, and easy to update as the product changes; -> Integrate performance tests into CI/CD pipelines to catch regressions early; -> Define performance benchmarks and thresholds in collaboration with engineering and product teams; -> Monitor platform behavior under load using observability tools and correlate metrics with test results; -> Document findings clearly and present actionable recommendations to engineering teams; Your skills and experiences: -> 5+ years of hands-on performance and load testing experience on production-scale systems; -> Strong practical experience with k6, Gatling, JMeter, or Locust — you've built complex scripts from scratch; -> Good understanding of backend architecture, databases, and how infrastructure behaves under load; -> Comfortable reading and interpreting metrics from tools like Grafana, Datadog, New Relic, or similar; -> Solid understanding of HTTP, WebSockets, and real-time communication protocols; -> Experience testing APIs under load including auth flows, concurrent sessions, and stateful scenarios; -> Familiar with CI/CD pipelines and integrating performance tests into automated build processes; -> Fluent with Git and working within agile engineering teams; -> Curious by nature — you enjoy understanding why a system behaves the way it does under pressure; -> Sharp analytical mind — you can look at a wall of metrics and know exactly where to focus; -> Clear communicator — you can explain a complex performance issue to a developer and a product manager in the same conversation; -> Self-driven — you don't wait to be told there's a problem; you go looking for one; -> Fluent English - at least B2+ level; If interested, please apply safely through this portal (application rules are in accordance with GDPR). Employment agency Nr 17138.

🏢 Summary: Fullstack Developer role focused on building and evolving Java-based microservices and modern Angular Single Page Applications within an event-driven architecture. The position emphasizes backend development with Spring Boot, Kafka integration, and secure, scalable solutions, while contributing to CI/CD pipelines and frontend best practices. Work involves close collaboration on solution design, security implementation, and continuous improvement in an Agile environment. 🗂️ Requirements: Strong hands-on experience with Java 17–21, Strong experience with Spring Boot 3.x, Experience with microservices architecture, Experience with Kafka in event-driven or messaging systems, Strong practical experience with SQL and Oracle, Experience or strong understanding of Redis, Experience with Domain Driven Design, Experience with Node.js, Experience with TypeScript, Experience building Single Page Applications with Angular, Strong knowledge of Angular architecture and best practices, Strong understanding of web application security, Practical knowledge of OIDC and OAuth2, Experience with Git, Experience working in Agile methodologies 📃 Skills: Java, Spring, SpringBoot, Microservices, Kafka, SQL, Oracle, Redis, DDD, Node.js, TypeScript, Angular, SPA, Security, OIDC, OAuth2, Git, Agile 🏢 Description: Location: Hybrid work model – 2-3 days per week from the Warsaw office Salary: 160 – 170 PLN net/h (B2B via Experis) Tasks: •    Design, develop, and maintain fullstack applications with a strong emphasis on backend and modern frontend architectures •    Build high-quality, maintainable, secure, scalable, and testable software aligned with business requirements •    Develop and evolve Java-based microservices using Spring Boot •    Contribute to Single Page Applications development ensuring frontend best practices •    Collaborate with business and technical stakeholders to clarify and refine functional and non-functional requirements •    Participate in solution design pre-project studies and technical decision-making •    Integrate systems using event-driven architectures and streaming platforms •    Optimize and maintain existing codebases •    Implement execute and maintain automated tests and CI/CD pipelines •    Ensure application security including identity management and secure authentication flows •    Maintain and update technical documentation •    Participate in internal and external developer communities to share best practices •    Continuously improve skills in modern technologies and software engineering practices Requirements: Backend & Architecture •    Strong hands-on experience with Java 17–21 focusing on modern Java •    Strong experience with Spring Boot 3.x and microservices architectures •    Required experience with Kafka in event-driven or messaging-based systems •    Strong practical experience with SQL using Oracle •    Experience or strong understanding of Redis •    Experience with Domain Driven Design Frontend •    Required experience with Node.js •    Required experience with TypeScript •    Solid experience building Single Page Applications using Angular •    Strong knowledge of Angular best practices architecture and maintainability •    Experience with SPA development •    Webpack knowledge is a nice to have Security •    Strong understanding of web application security •    Practical knowledge of OIDC and OAuth2 protocols •    Experience with identity management platforms as a strong advantage •    Awareness of OWASP principles certifications are a plus DevOps & Tooling •    Required experience with Git •    Experience with CI/CD pipelines GitLab CI and Jenkins as a nice to have •    Maven knowledge as a nice to have •    Docker and Kubernetes knowledge as a nice to have •    Experience with IntelliJ and VS Code •    Knowledge of Jira and Confluence •    Python knowledge as a nice to have •    Practice with AI based code generation tools as a nice to have Methodologies & Ways of Working •    Experience working in Agile methodologies such as Scrum and Kanban •    DevOps mindset and practices •    Ability to collaborate in distributed international teams Offer: •    Multisport card •    Private healthcare •    Access to an e‑learning platform •    Group life insurance

🏢 Summary: Frontend Engineer role focused on building enterprise AI applications using Next.js, React, and TypeScript in a fully on-site Warsaw office environment. The position involves developing real-time AI interfaces, managing complex frontend state, improving performance and accessibility, and contributing to technical decisions. Candidates will work with modern AI development tools and enterprise-scale frontend systems. 🗂️ Requirements: 3–5 years of frontend engineering experience, Strong knowledge of React, Strong knowledge of TypeScript, Strong knowledge of Next.js, Experience building production Next.js applications, Understanding of SSR, SSG, and CSR, Experience with complex state management, Experience with real-time updates and optimistic UI, Experience building AI or LLM-based interfaces, Understanding of frontend performance and Core Web Vitals, Knowledge of accessibility and localization, Security-focused development approach, Experience using AI coding assistants, Good communication skills, Ability to work fully on-site in Warsaw 📃 Skills: React, TypeScript, Next.js, SSR, SSG, CSR, AI, LLM, CoreWebVitals, Localization, Accessibility, Security, GitHubCopilot, OpenAI, Claude, ReactFlow, Highcharts, RAG, MCP, DSPy, Node.js, Python 🏢 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 frontend engineer with several years of experience who wants to build user interfaces for enterprise AI products. You will help create applications that allow users to work with AI systems in a simple and reliable way. You will build production applications using Next.js, work with complex application state, real-time AI features, and modern frontend technologies. Over time, you will also take part in important technical decisions. The position is based in Warsaw and requires working from the office. Responsibilities Build and deliver production Next.js applications with complex state management and real-time AI features. Create user interfaces for AI-powered tools, including streaming AI responses, semantic search, knowledge graphs, and AI agents. Help improve our component library and design system to keep the UI consistent, reusable, and accessible. Develop enterprise features such as localization, accessibility, browser compatibility, and security. Monitor applications after release, improve performance, reduce bundle size, and track Core Web Vitals. Use AI tools every day to improve development speed and internal frontend workflows. Maintain high code quality through testing and code reviews. Requirements Around 3–5 years of experience as a frontend engineer. Strong knowledge of React, TypeScript, and Next.js. Experience building production Next.js applications and understanding the differences between SSR, SSG, and CSR. Good experience with state management, including real-time updates, optimistic UI, and multi-tenant applications. Experience building AI or LLM-based interfaces such as chat applications, streaming responses, or semantic search. Good understanding of frontend performance, Core Web Vitals, and user experience. A security-focused approach and knowledge of accessibility and localization. Experience using AI coding assistants as part of your daily development work. Good 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, or semantic search interfaces. Knowledge of MCP, DSPy, or other modern AI frameworks. Basic understanding of Node.js or Python backend development. Contributions 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: Senior QA Automation Lead role focused on designing, implementing, and maintaining automated test frameworks for UI, API, end-to-end, and performance testing within CI/CD pipelines. The position includes leading a small QA team and owning test coverage, reliability, and defect resolution across product areas. B2B contract, office-based in Warsaw, with responsibility for integrating automated testing into the development lifecycle. 🗂️ Requirements: 6+ years QA automation experience, Ownership of test automation codebase, Hands-on experience with Playwright, Cypress or Selenium, Proficiency in JavaScript or TypeScript, Experience with CI/CD-integrated test pipelines, API testing experience, Experience testing RESTful APIs and WebSockets, Experience with Git workflows 📃 Skills: Playwright, Cypress, Selenium, JavaScript, TypeScript, Jenkins, Git, Postman, Supertest, REST, WebSocket, CI/CD 🏢 Description: Employer: International cassino games studio Location: Warsaw (4 days from the office, 1 day remotely) Salary: 5950 - 7600 EUR on B2B Cooperation model: B2B Start date: ASAP Recruitment process: 2 online interviews and recruitment task Technology stack: Playwright or Cypress or Selenium, GIT, Jenkins, Javascript or Typescript Your role is to: -> Own the design, implementation, and maintenance of automated test frameworks covering UI, API, and end-to-end testing; -> Lead a small team of QA engineers, providing hands-on guidance, code reviews, and day-to-day direction; -> Take responsibility for test coverage across assigned product areas, ensuring regressions are caught before they reach production; -> Build and maintain performance test scripts that are reusable, version controlled, and easy to update as the product changes; -> Integrate and maintain automated test suites within CI/CD pipelines, owning the feedback loop for your team; -> Define and enforce testing standards, processes, and documentation within the squad; -> Collaborate with developers and product managers to review requirements and translate them into thorough test plans; -> Own defect triage and test failure analysis, coordinating directly with engineers to drive resolution; -> Continuously improving test reliability, speed, and coverage, proactively flagging risks to engineering leads; Your skills and experiences: -> 6+ years of QA automation experience, with demonstrated ownership of a test automation codebase; -> Solid hands-on experience with frameworks such as Playwright, Cypress, or Selenium; -> Strong proficiency in TypeScript and/or JavaScript for writing and maintaining test scripts; -> Proven experience owning CI/CD-integrated test pipelines (GitHub Actions, Jenkins, or similar); -> Solid API testing experience using tools such as Postman or Supertest; -> Familiarity with RESTful API and WebSocket testing for real-time features; -> Good understanding of Git workflows and agile delivery practices; -> Strong communicators who can represent quality concern clearly to developers and product stakeholders; -> Ownership mentality — takes accountability for test outcomes and drives issues through to resolution; -> Organized and methodical, able to manage workload across multiple features and release cycles; -> Collaborative team lead who enjoys growing junior engineers and raising the quality bar;

🏢 Summary: Frontend Developer (React) role focused on designing and developing a modern greenfield web application using JavaScript/TypeScript and contemporary frontend frameworks. The position involves implementing asynchronous communication with backend services and delivering scalable, production-ready solutions in collaboration with cross-functional teams. Hybrid work model with B2B contract. 🗂️ Requirements: Very good knowledge of JavaScript and/or TypeScript, Commercial experience with modern frontend frameworks (React or Lit), Practical experience with asynchronous communication (AJAX, REST API, WebSockets), Experience in building applications وفق Responsive Web Design (RWD) principles, Ability to write clean, testable, and scalable code 📃 Skills: JavaScript, TypeScript, React, Lit, AJAX, REST, WebSockets, RWD 🏢 Description: Programista Frontend / Programistka Frontend (React) Lokalizacja: hybryda: Warszawa lub Katowice (2x w tygodniu) Wynagrodzenie: B2B: 1000-1100 MD / B2B Zadania: ·       Projektowanie i rozwój nowoczesnej aplikacji webowej w oparciu o JavaScript / TypeScript oraz frameworki takie jak React lub Lit ·       Aktywny udział w tworzeniu aplikacji typu greenfield architektonicznych po wdrożenie produkcyjne ·       Implementacja asynchronicznej komunikacji z backendem. ·       Wsparcie procesu wdrożeniowego w środowisku chmurowym (Google Cloud Platform) ·       Współpraca z zespołami backendowymi, DevOps i UX/UI w celu dostarczania spójnych i skalowalnych rozwiązań ·       Dokumentowanie rozwiązań technicznych i dzielenie się wiedzą w zespole Wymagania: Bardzo dobra znajomość JavaScript i/lub TypeScript Doświadczenie komercyjne w pracy z nowoczesnymi frameworkami frontendowymi, takimi jak: React, Lit Praktyczna znajomość pełnej asynchroniczności: komunikacja AJAX / REST API, praca z WebSockets, obsługa zdarzeń i asynchronicznych przepływów danych Doświadczenie w tworzeniu aplikacji zgodnie z zasadami Responsive Web Design (RWD) (aplikacje dostosowane do różnych rozdzielczości i urządzeń) Umiejętność pisania czystego, testowalnego i skalowalnego kodu Doświadczenie w pracy zespołowej w metodykach zwinnych (Scrum / Agile) Dobra znajomość języka angielskiego Mile widziane: Doświadczenie w realizacji projektów bankowych lub finansowych Znajomość architektury aplikacji działających w chmurze (Google Cloud Platform – GCP)

🏢 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: This is a fully on-site position in Warsaw city centre. Remote and hybrid work are not available. 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. 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 the 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 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 • 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: Senior Frontend Engineer role focused on building enterprise-grade AI-powered Next.js applications with complex state management, real-time features, and scalable frontend architecture. The position involves creating advanced AI interfaces, improving performance and accessibility, and contributing to design systems in a fully on-site Warsaw office environment. Candidates will work with modern AI development tools and enterprise-scale frontend technologies. 🗂️ Requirements: 5+ years of frontend development experience, 3+ years of React experience, Strong TypeScript skills, Production experience with Next.js, Knowledge of App Router, Knowledge of Server Components, Understanding of SSR, Understanding of SSG, Understanding of CSR, Experience with complex state management, Experience with real-time updates, Experience with optimistic UI, Experience with multi-tenant systems, Experience building AI or LLM interfaces, Knowledge of frontend performance optimization, Experience improving Core Web Vitals, Understanding of accessibility standards, Understanding of localization, Understanding of frontend security, Experience handling sensitive data, Experience using AI coding assistants, Strong communication skills, Ability to work fully on-site in Warsaw 📃 Skills: React, TypeScript, Next.js, SSR, SSG, CSR, AI, LLM, CoreWebVitals, Accessibility, Localization, Security, ReactFlow, Highcharts, Node.js, Python, RAG, OpenAI, Codex, GitHub, 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: Office-based QA Automation Engineer role focused on building and maintaining automated UI, API, and end-to-end tests for a casino gaming platform. The position involves owning CI/CD test pipelines, ensuring high test coverage, and performing API, WebSocket, and performance testing. The role requires close collaboration with developers and proactive quality ownership in a fast-paced environment. 🗂️ Requirements: 5+ years of QA automation experience, Strong hands-on experience with Playwright or Cypress or Selenium, Strong TypeScript skills, Strong JavaScript skills, Experience building and maintaining CI/CD test pipelines, Experience in API testing including contract testing, Experience in WebSocket testing, Experience with load testing tools (k6 or Gatling or JMeter), Experience with Git, Fluent English (B2+ level) 📃 Skills: TypeScript, JavaScript, Playwright, Cypress, Selenium, WebSocket, k6, Gatling, JMeter, Git, CI/CD 🏢 Description: Employer: International cassino games studio Location: Warsaw (4 days from the office, 1 day remotely) Salary: 5 000 - 6 650 EUR on B2B Cooperation model: B2B Start date: ASAP Recruitment process: 3 online interviews Technology stack: Typescript, Javascript, Cypress or Selenium or Playwright, WebSocket Your role is to: -> Write and maintain automated tests across UI, API, and end-to-end flows; -> Build reliable test pipelines and keep them running cleanly within CI/CD; -> Dig into test failures and get to the root cause — not just mark them as flaky and move on; -> Work with developers to understand how features are built and test them properly; -> Cover API flows thoroughly including chained requests, contracts, and WebSocket behavior; -> Run performance and load tests on critical platform areas and flag what needs fixing; -> Keep test coverage healthy and proactively fill gaps as the product evolves; Your skills and experiences: -> 5+ years of QA automation experience with real, hands-on work to show for it; -> Strong with Playwright, Cypress, or Selenium — you've built with them, not just maintained them; -> Solid TypeScript and JavaScript skills, writing code that's clean and easy to maintain; -> Comfortable owning CI/CD test pipelines end to end; -> Good API testing experience including contract and WebSocket testing; -> Familiar with load testing tools like k6, Gatling, or JMeter; -> Fluent with Git and working within agile teams; -> You work independently and take ownership of your output; -> You care about quality and it shows in your work; -> You communicate clearly and flag issues before they become problems; -> You're collaborative — you work well with developers and product alike; -> Fluent English - at least B2+ level;