Senior Frontend AI Developer

🏢 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: Long-term remote B2B opportunity for a Senior Frontend Developer to build a secure, real-time incident reporting platform for a European Union institution. The role focuses on micro-frontend architecture, modernization of monolithic applications, performance optimization, and collaboration across multidisciplinary teams. 🗂️ Requirements: University degree in Computer Science, Computer Engineering, Telecommunications, Information Technology, Business Administration and Management, or related discipline, 5+ years of professional frontend development experience, Advanced JavaScript and TypeScript knowledge, Experience with Angular, Experience with SPA and micro-frontend architectures, Experience with .NET and C#, Knowledge of HTML5, Web Components, and browser APIs, Knowledge of web application performance, scalability, and security, Familiarity with cloud environments and container platforms 📃 Skills: JavaScript, TypeScript, Angular, NET, C#, HTML5, WebComponents, SPA, Microfrontends, Microservices, OpenShift, Cloud, Containers, UI/UX 🏢 Description: Currently, for one of our Partners, we are looking for an experienced Senior Frontend Developer (m/f/n) to support a long‑term project delivered for an organization of the European Union based in Warsaw. You will be joining a strategic project for a European institution, linked to security and border control activities. The project aims to develop a new generation of systems capable of reporting and disseminating information on incidents in real time. The solution will implement the new requirements set out in the regulation recently adopted by the European Commission. Tasks: As a Senior Front-End Engineer, you will participate in the definition, design and implementation of the new platform, working closely with multidisciplinary teams to build scalable, secure and high-performance solutions: Design and implement solutions based on micro-frontend architecture. Participate in the transformation of monolithic applications into architectures based on microservices and micro-frontends. Analyse, optimise and improve the performance, scalability and maintainability of applications. Apply security best practices from the design phase (Security by Design). Collaborate with business analysts in defining and validating functional requirements. Work closely with backend and frontend teams to ensure integrated and consistent solutions. Produce high-quality technical documentation. Carry out code reviews and contribute to the continuous improvement of development standards. Support the analysis and design of user interfaces (UI/UX) Requirements: A university degree in Computer Science, Computer Engineering, Telecommunications, Information Technology, Business Administration and Management, or related disciplines. A minimum of 5 years of demonstrable professional experience in front-end development. Advanced knowledge of JavaScript and TypeScript. Solid experience with modern frameworks such as Angular. Practical experience with SPA and micro-frontend architectures. Experience in .NET with C#. In-depth knowledge of HTML5, Web Components and standard browser APIs. Knowledge of performance optimisation, scalability and security in web applications. Familiarity with cloud environments and container platforms (experience with OpenShift will be an advantage). Offer: B2B contract Remote set-up Rate: 165-175 PLN netto + VAT/H

🏢 Summary: Senior AI Applied Software Engineer role focused on building secure, scalable digital-banking entitlement services and end-to-end product features. The position combines Java/Spring microservices and Angular frontend development with AI initiatives such as LLM voice assistants and real-time personalization, in a hybrid Kraków setup. 🗂️ Requirements: Kraków-area residence, Hybrid office work twice weekly, 5+ years of experience, Java, Spring, JPA/Hibernate, Maven, Microservices, Cloud, Angular, TypeScript, RxJS, Webpack, Jenkins, Enterprise Integration Patterns, CI/CD, English 📃 Skills: Java, Spring, JPA, Hibernate, Maven, Microservices, Cloud, Angular, TypeScript, RxJS, Webpack, Jenkins, OpenAI, ML, Vue.js, NetflixOSS 🏢 Description: The Job At Backbase, we don’t just deliver software – we redefine how people manage their finances. We are looking for a Senior AI Applied Software Engineer to join our R&D department in Kraków. You will join the team which sits at the core of Backbase platform: Entitlements. Handling complex problems related to Access Control, Approvals and Limits. By joining our team, you won’t just write code; you will design systems that impact millions of users across over 100 financial institutions worldwide. Meet the Job As a Senior AI Applied Software Engineer  you are a technical cornerstone of your squad. You will design and deliver complex features with minimal guidance, ensuring that both the "engine" (Backend) and the "experience" (Frontend) are performant, secure, and scalable. Full SDLC Ownership: Lead the entire lifecycle of digital banking products—from initial idea and architectural design to release and maintenance. Architectural Excellence: Improve system architecture and design components that integrate smoothly across APIs and microservices. Technical Leadership: Act as a go-to resource for your team, mentoring junior engineers, conducting critical code reviews, and raising the bar for engineering standards. AI & Innovation: Contribute to the evolution of LLM-based voice assistants and real-time personalization engines using OpenAI and ML models. Security-First Mindset: Implement "Entitlements" and fraud prevention services with a focus on non-functional requirements like security, scalability, and resilience. Collaborative Culture: Work in a Pod based model, collaborating with Architects, Product Owners, and UX Designers to align technical solutions with business needs. Who You Are Location: You live in Kraków or nearby area and you are willing to work in a hybrid mode - twice per week from our office. Experience: You have 5–7+ years of professional experience building complex, high-traffic products. Backend Mastery: Solid understanding of Java , Spring JPA/Hibernate , and Maven . Experience with Microservices (Netflix OSS is a plus) and Cloud technologies. Frontend Expertise: Strong skills in Angular and TypeScript . You are proficient with RxJS and modern build systems (Webpack, Jenkins). Experience with Vue.js is a plus. System Design: You have a solid grasp of Enterprise Integration Patterns and can design systems that handle complex data flows between services. The "Senior" Edge: You don't just solve tickets; you identify gaps in tooling, reduce technical debt, and optimize CI/CD pipelines to streamline delivery. Communication: Excellent English (spoken and written). You can confidently explain technical concepts to non-technical stakeholders and get buy-in for your architectural decisions. Domain Knowledge: Previous experience in Fintech or Banking is highly considered an advantage. What We Offer Growth: €1,000 annual self-development budget, a clear promotion path, and dedicated time for training. Rewards: Competitive base salary plus an annual bonus and referral bonuses. Hybrid Work: A flexible arrangement combining remote work with our vibrant Kraków office. Office Perks: Daily lunches, community breakfasts on Wednesdays, and high-end hardware (MacBook). Well-being: Private healthcare (Luxmed), Headspace app subscription, and a Work-From-Home allowance. Culture: Integration events, flexible working hours, and a focus on healthy work-life balance.

🏢 Summary: Senior AI Applied Software Engineer role focused on building secure, scalable digital banking products within the Entitlements domain. The position leads end-to-end delivery of frontend-centric features, system architecture, and AI-driven capabilities while collaborating in a hybrid Kraków-based team. 🗂️ Requirements: Kraków-area residence and hybrid office availability twice weekly, 5–7+ years building complex, high-traffic products, Angular proficiency, TypeScript proficiency, RxJS proficiency, Modern build-system experience, Enterprise Integration Patterns knowledge, Complex data-flow system design experience, CI/CD pipeline optimization experience, Excellent spoken and written English 📃 Skills: Angular, TypeScript, RxJS, Webpack, Jenkins, Java, Spring, JPA, Hibernate, Maven, Microservices, NetflixOSS, Cloud, OpenAI, LLMs, ML, Vue.js 🏢 Description: The Job At Backbase, we don’t just deliver software – we redefine how people manage their finances. We are looking for a Senior AI Applied Software Engineer to join our R&D department in Kraków. You will join the team which sits at the core of Backbase platform: Entitlements. Handling complex problems related to Access Control, Approvals and Limits. By joining our team, you won’t just write code; you will design systems that impact millions of users across over 100 financial institutions worldwide. Meet the Job As a Senior AI Applied Software Engineer  you are a technical cornerstone of your squad. You will design and deliver complex features with minimal guidance, ensuring that both the "engine" (Backend) and the "experience" (Frontend) are performant, secure, and scalable. Full SDLC Ownership: Lead the entire lifecycle of digital banking products—from initial idea and architectural design to release and maintenance. Architectural Excellence: Improve system architecture and design components that integrate smoothly across APIs and microservices. Technical Leadership: Act as a go-to resource for your team, mentoring junior engineers, conducting critical code reviews, and raising the bar for engineering standards. AI & Innovation: Contribute to the evolution of LLM-based voice assistants and real-time personalization engines using OpenAI and ML models. Security-First Mindset: Implement "Entitlements" and fraud prevention services with a focus on non-functional requirements like security, scalability, and resilience. Collaborative Culture: Work in a Pod based model, collaborating with Architects, Product Owners, and UX Designers to align technical solutions with business needs. Who You Are Location: You live in Kraków or nearby area and you are willing to work in a hybrid mode - twice per week from our office. Experience: You have 5–7+ years of professional experience building complex, high-traffic products. Frontend Mastery: Strong skills in Angular and TypeScript . You are proficient with RxJS and modern build systems (Webpack, Jenkins). Experience with Vue.js is a plus. Backend Exposure: While the daily work is heavily frontend-centric, prior exposure to of Java , Spring JPA/Hibernate , Maven, Microservices (Netflix OSS is a plus) and Cloud technologies is a welcome bonus, offering a great foundation for future fullstack growth within the team. System Design: You have a solid grasp of Enterprise Integration Patterns and can design systems that handle complex data flows between services. The "Senior" Edge: You don't just solve tickets; you identify gaps in tooling, reduce technical debt, and optimize CI/CD pipelines to streamline delivery. Communication: Excellent English (spoken and written). You can confidently explain technical concepts to non-technical stakeholders and get buy-in for your architectural decisions. Domain Knowledge: Previous experience in Fintech or Banking is highly considered an advantage. What We Offer Growth: €1,000 annual self-development budget, a clear promotion path, and dedicated time for training. Rewards: Competitive base salary plus an annual bonus and referral bonuses. Hybrid Work: A flexible arrangement combining remote work with our vibrant Kraków office. Office Perks: Daily lunches, community breakfasts on Wednesdays, and high-end hardware (MacBook). Well-being: Private healthcare (Luxmed), Headspace app subscription, and a Work-From-Home allowance. • • Culture: Integration events, flexible working hours, and a focus on healthy work-life balance.

🏢 Summary: Join an early-stage product team to design and deliver scalable, high-volume backend systems using Node.js, TypeScript, and AWS. The role offers end-to-end ownership, influence over architecture and engineering practices, and mentoring responsibilities in a hybrid Kraków setup. 🗂️ Requirements: 5+ years of production software development with Node.js and TypeScript, Practical AWS knowledge, Distributed systems design knowledge, Scalability knowledge, Event-driven architecture experience, Automated testing experience, Independent problem-solving ability, English communication skills, Ability to work in an evolving, fast-paced environment 📃 Skills: Node.js, TypeScript, AWS, Lambda, ECS, S3, RDS, Jest, Vitest, Playwright 🏢 Description: Senior Backend Engineer: Node.js & AWS Location: Kraków, Poland Working model: Hybrid Contract: Employment agreement or B2B Build high-scale systems from the beginning We’re hiring an experienced backend engineer to join a growing international technology business as it expands its engineering presence in Kraków. This is an opportunity to help create a new product rather than inherit a finished roadmap. You’ll influence early technical decisions, build systems designed for demanding workloads, and take meaningful ownership from architecture through production. The company develops robust data infrastructure used by organizations operating in complex, high-stakes environments. Its technology processes large volumes of information and supports products where speed, availability, and accuracy genuinely matter. If you enjoy solving difficult engineering problems, making pragmatic architectural decisions, and seeing your work reach production, this role offers plenty of room to make an impact. What you’ll be doing Design and deliver scalable backend services with Node.js and TypeScript. Build APIs and asynchronous, event-driven workflows in AWS. Engineer reliable systems capable of supporting intensive, high-volume workloads. Own features throughout their lifecycle, from technical discovery and design to deployment and ongoing improvement. Help establish the architecture and engineering practices of a new product. Partner with product specialists and engineers across multiple disciplines. Support other developers through mentoring, thoughtful reviews, and knowledge sharing. Strengthen standards around testing, security, maintainability, and operational reliability. Respond constructively as requirements evolve and new technical challenges emerge. What we’re looking for At least five years of professional experience building production software with Node.js and TypeScript. Strong practical knowledge of AWS. Experience with services such as Lambda, ECS, S3, or RDS is especially relevant. A solid understanding of distributed system design, scalability, and event-driven architecture. Experience using modern automated testing tools such as Jest, Vitest, or Playwright. The confidence to investigate unfamiliar problems and move work forward independently. Clear English communication skills. Comfort working in an energetic environment where priorities and products continue to evolve. Additional experience we’d value You don’t need to bring everything on this list, but any of the following would be useful: Go development. Distributed platforms or messaging-based systems. Large language models or contemporary AI development tools. React. Relational and non-relational databases. Docker and Kubernetes. CI/CD pipelines and modern delivery practices. Why consider this opportunity? Join at an early stage and help shape a product’s technical direction. Work on challenging systems where performance and reliability are fundamental. Take genuine ownership without unnecessary layers of decision-making. Become part of a new engineering group in Kraków with room to influence how it develops. Collaborate in an international, English-speaking environment. Choose between an employment contract and a B2B arrangement. Work within a hybrid model in Kraków. Join a profitable, expanding business focused on sustainable long-term growth.