Senior / Lead Front-End Engineer (UI Architecture & Governance)

🏢 Summary: Senior UX Engineer role to co-lead an internal design system and ShadCN-based UI libraries for a global financial institution. The position focuses on translating complex Figma architectures into production-ready React/TypeScript components while enforcing firmwide UI standards. It combines hands-on design system engineering, UX governance, and front-end quality enablement across enterprise applications. 🗂️ Requirements: 8+ years in front-end, UX engineering, or design-system engineering, Extensive experience managing large Figma design systems (tokens, variants, governance), Deep production experience with React, Deep production experience with TypeScript, Strong experience with Tailwind CSS, Strong experience with ShadCN UI, Strong experience with Radix UI, Strong practical knowledge of WCAG accessibility standards, Ability to define and enforce UI standards across engineering, design, and product teams 📃 Skills: React, TypeScript, Figma, ShadCN, Radix, Tailwind, Storybook, Git, HTML5, CSS, WCAG, DesignTokens 🏢 Description: 🔹 About the Project We are looking for a Senior UX Engineer to co-lead the internal design system, ShadCN-based UI libraries, and UI standards for a leading global financial institution. This is a highly technical, hands-on role bridging the gap between Figma architecture and production-ready React/TypeScript code across a massive, data-dense enterprise ecosystem. 🔹 The Role & Focus Areas Design System Engineering (35%): Maintaining ShadCN UI asset libraries and translating Figma patterns into production-ready React/TypeScript components. UX Governance (25%): Setting firmwide standards for tokens, variants, interaction states, layouts, and Figma libraries. Product Enablement (20%): Partnering with application teams to review workflows and improve UI consistency and usability. DevEx & Docs (20%): Writing clean documentation, building examples, and running code reviews to raise the front-end quality bar. 🔹 Must Haves (Non-Negotiables) 8+ years in front-end, UX engineering, or design-system engineering. Figma Architecture: Heavy experience managing large, comprehensive Figma design systems (tokens, variants, governance). Tech Stack Mastery: Deep production experience with React, TypeScript, Tailwind CSS, ShadCN UI , and Radix UI . Accessibility: Strong practical judgment of WCAG standards across complex workflows. Communication: Ability to enforce standards smoothly across engineering, design, and product teams. 🔹 Tech Stack Mandatory: React, TypeScript, Figma (Libraries & Tokens), ShadCN UI, Radix UI, Tailwind CSS. Tools: Storybook, Git, Design Tokens, Semantic HTML5/CSS. 🔹 Nice to Have Experience with capital markets, trading UIs, real-time grids, or financial charts. Modern tooling experience (monorepos, shared packages, Turborepo/Nx). Desktop interop experience (FDC3, OpenFin, Tauri, WebView2). Sounds like your next challenge? Send us your CV and let's talk!

🏢 Summary: Senior Front-End Software Architect role focused on modernizing and scaling a large enterprise web platform through micro-frontend architecture and React-based solutions. The position combines hands-on development with architectural leadership, driving migration from legacy systems and defining front-end standards across teams. You will design a shared App Shell, improve performance and security, and guide technical direction while staying close to the code. 🗂️ Requirements: 8+ years of front-end development experience, Expert knowledge of JavaScript, Expert knowledge of TypeScript, Hands-on experience with micro-frontends architecture, Experience modernizing legacy front-end systems, Strong knowledge of scalable and high-performance web applications, Advanced knowledge of modern build tools, Experience with unit and end-to-end testing, Experience with design systems and component-driven development, Strong CSS knowledge including preprocessors, Experience with CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Webpack, Vite, Rollup, Jest, TestingLibrary, Vitest, Storybook, SASS, LESS, CSS, CI/CD, GitHubActions, Jenkins, Terraform, ModuleFederation, Microfrontends 🏢 Description: We’re looking for an experienced Front-End Software Architect to help modernize and scale a large enterprise web platform. In this role, you’ll work hands-on with modern front-end technologies, design and implement a micro-frontend App Shell architecture, and support the migration from legacy systems to modern, React-based solutions. You’ll have a strong technical voice, influence architectural decisions, and help shape front-end standards used across multiple teams — all while staying close to the code. Responsibilities: Design and implement a scalable micro-frontend architecture, including a shared App Shell and reusable component libraries. Lead the migration of features from legacy applications (e.g. .NET-based systems) to modern React solutions. Collaborate closely with full-stack and platform engineers to define patterns for module federation, routing, and inter-application communication. Establish and promote front-end standards, architectural patterns, and best practices across teams. Define integration approaches for shared authentication, login flows, routing across multiple apps on the same domain, and inter-app communication. Drive improvements in performance, security, observability, and reliability across distributed front-end systems. Review code, mentor other engineers, and contribute to a culture of high engineering standards and continuous improvement. Requirements: 8+ years of experience in front-end development, with a strong technical background and experience influencing architecture. Expert-level knowledge of JavaScript and TypeScript. Hands-on experience designing and delivering micro-frontends and modernizing legacy front-end architectures. Strong understanding of building scalable, high-performance web applications. Experience aligning technical solutions with business and delivery goals. Advanced knowledge of modern build tools such as Webpack, Vite, or Rollup. Solid testing experience, including unit and end-to-end testing (Jest, Testing Library, Vitest, or similar). Deep understanding of design systems and component-driven development (Storybook, design tokens). Strong CSS knowledge, including preprocessors (SASS / LESS) and responsive layouts. Experience working with CI/CD pipelines and tools like GitHub Actions, Jenkins, or Terraform. Familiarity with backend technologies and microservices architectures is a plus. Nice to have: Knowledge of web accessibility standards (WCAG) and internationalization (i18n). Experience building offline-ready applications and implementing graceful degradation strategies.

🏢 Summary: Senior Full-Stack Software Architect role focused on designing and modernizing a scalable enterprise web platform using micro-frontend architecture and cloud-based backend services. The position combines hands-on technical leadership with architectural design across React front-end and Java backend ecosystems. It involves driving legacy modernization, defining platform standards, and ensuring scalable, secure, and high-performance solutions. 🗂️ Requirements: 10+ years of software engineering experience, Experience in architectural roles within large-scale or SaaS environments, Expert-level Java for backend services, Expert-level JavaScript and TypeScript, Strong experience with React and micro-frontend architectures, Hands-on experience with AWS, Azure, or GCP, Experience with cloud-native architectures, Experience with CI/CD pipelines, Experience with infrastructure automation using Terraform, Strong understanding of SDLC, testing, deployment automation, and production monitoring 📃 Skills: Java, JavaScript, TypeScript, React, AWS, Azure, GCP, Terraform, Jenkins, GitHubActions, CI/CD, Microfrontends, .NET, SaaS, SDLC, Cloud, ModuleFederation 🏢 Description: We’re looking for an experienced Senior Full-Stack Software Architect to join a UI Platform team and play a key role in shaping the evolution of a modern enterprise web platform. In this position, you’ll work as a hands-on technical authority, designing scalable architectures that connect micro-frontend solutions with robust, cloud-based backend services. This role is ideal for someone who enjoys working at the intersection of front-end orchestration and backend architecture, modernizing legacy systems, and setting technical direction that scales across teams. Responsibilites: Design and implement a scalable micro-frontend App Shell architecture, including reusable component libraries. Drive the modernization of legacy systems (e.g. .NET-based applications) toward modern React- and Java-based solutions using safe, incremental migration patterns. Collaborate closely with platform and full-stack engineers to define standards for module federation, routing, and inter-application communication. Establish and promote architectural patterns, coding standards, and best practices across multiple engineering teams. Define integration strategies for shared authentication, login workflows, URL routing, and communication between micro-applications. Improve platform-wide performance, observability, security, and reliability. Act as a hands-on architect: review code, guide implementation decisions, and ensure architectural consistency. Mentor engineers and contribute to a culture of technical excellence and continuous improvement. Requirements: 10+ years of experience in software engineering, including work in architectural roles within large-scale or SaaS environments. Strong background in both front-end and back-end architecture, with the ability to clearly document and communicate complex systems. Expert-level experience with Java for backend services and JavaScript / TypeScript + React for front-end and micro-frontend solutions. Hands-on experience with cloud platforms such as AWS, Azure, or GCP, and cloud-native architectures. Strong knowledge of CI/CD pipelines (e.g. GitHub Actions, Jenkins) and infrastructure automation tools like Terraform. Deep understanding of the software development lifecycle (SDLC), including testing strategies, deployment automation, and production monitoring. Strong communication skills and the ability to collaborate across teams, balance technical trade-offs, and influence architectural decisions. Nice to have: Practical experience with micro-frontends, large-scale legacy modernization, and designing high-performance web platforms. Familiarity with architectural documentation approaches such as the C4 model or modernization patterns like Strangler Fig.

🏢 Summary: Senior Frontend Engineer role focused on driving architectural direction and building scalable, high-quality frontend solutions using React and TypeScript. The position involves designing core features, shaping best practices, improving CI/CD and observability, and mentoring engineers. The engineer will collaborate cross-functionally to deliver performant, maintainable, and accessible user experiences. 🗂️ Requirements: Extensive experience with large-scale frontend applications, Strong hands-on experience with React, Strong hands-on experience with TypeScript, Deep understanding of web architecture and component design, Experience with performance optimization and responsive UI patterns, Solid knowledge of build tools, Experience with version control systems, Experience with CI/CD pipelines, Ability to design scalable and maintainable frontend solutions, Experience contributing to testing and deployment processes 📃 Skills: React, ReactNative, TypeScript, JavaScript, CI/CD, Git, HTML, CSS, Web, Serverless, Cloud 🏢 Description: Senior Frontend Engineer We’re looking for a seasoned engineer who combines deep hands-on skills with the ability to guide architectural direction, influence technical strategy, and mentor others. About the Role Your work will directly shape how thousands of businesses worldwide interact with the clients solutions — improving user experiences, driving customer satisfaction, and helping companies save valuable time. As part of this role, you will be making technical decisions, mentor colleagues, and contribute to setting best practices that strengthen frontend engineering across the company. You’ll collaborate closely with product managers, UX designers, and backend engineers to turn ideas into well-engineered solutions — balancing product velocity with long-term maintainability. Key Responsibilities Drive architectural and technical direction for frontend solutions across product suite. Design and implement core features and shared components using React/React Native, and TypeScript. Evaluate and introduce new technologies, patterns, and tools that improve scalability, maintainability, and performance. Contribute to the design system and ensure consistent, accessible, and performant user experiences. Work closely with other engineers to review code, share knowledge, and improve development practices. Act as a technical mentor — helping others grow through feedback, guidance, and collaboration. Ensure strong build, deployment, and testing processes that support rapid, reliable delivery. Contribute, or lead, broader engineering initiatives such as CI/CD improvements, observability, and cross-product consistency. Key Requirements Extensive experience in building and maintaining large-scale frontend applications. Deep understanding of web architecture, component design, performance optimization, and responsive UI patterns. Strong hands-on experience with React and TypeScript. Solid knowledge of build tools, version control, and CI/CD pipelines. A pragmatic mindset — able to balance innovation with delivery. Excellent collaboration and communication skills. Passion for technical craftsmanship and for helping others grow through mentorship and example. Nice to Have Experience in designing intuitive user interfaces. Familiarity with cloud services and serverless architectures. Knowledge of accessibility standards in web development. Location: København Allocation: Full-time. Start date: ASAP End date: 3-6 months

🏢 Summary: Mid/Senior Frontend Developer role focused on building responsive UI views from Figma designs using React 18 and TypeScript. The position involves integrating new components into an existing architecture, managing state with Redux Toolkit, and ensuring WCAG-compliant accessibility. The developer will also handle API communication and maintain high code quality standards. 🗂️ Requirements: Advanced knowledge of React 18, Strong proficiency in TypeScript, Practical experience with Redux Toolkit, Experience with Axios for API integration, Strong knowledge of SCSS, Solid understanding of WCAG accessibility standards, Ability to convert Figma designs into responsive UI components, Experience working within existing project architecture and coding conventions 📃 Skills: React, TypeScript, ReduxToolkit, Axios, SCSS, WCAG, Figma 🏢 Description: Join a project focused on building and implementing sophisticated UI views based on Figma designs. This role requires a developer who not only excels in React 18 and TypeScript but also understands the critical importance of accessibility ( WCAG ). You will be responsible for integrating new views into an existing project structure, ensuring consistency with established coding conventions and library usage. Details Seniority: Mid/Senior. Stack: React 18, TypeScript, Redux Toolkit. Start Date: ASAP. Location: Remote. Communication: English required. Rate : up to 115 pln/h net B2B Responsibilities UI Implementation: Seamlessly converting Figma designs into functional, responsive web components. State & Data: Managing complex application state via Redux Toolkit and handling API communication with Axios . Accessibility: Ensuring all developed views meet WCAG requirements for inclusive user experiences. Code Quality: Writing testable, maintainable code that strictly adheres to the existing project's architecture and conventions. Styling: Delivering polished interfaces using SCSS and potentially Ant Design . Requirements Core: Advanced knowledge of React 18 and TypeScript . State Management: Practical experience with Redux Toolkit . API: Proficiency in using Axios for web services. Styling: Mastery of SCSS . Compliance: Solid understanding of WCAG standards. Nice to Have Experience with Ant Design (UI Library). Unit testing expertise with Vitest . Familiarity with Storybook for component documentation and testing.

🏢 Summary: Senior ReactJS UI Engineer role focused on leading front-end architecture and UX optimization for scalable, high-performance web applications. The position involves driving UI enhancements, implementing design patterns, and delivering robust React-based solutions in a hybrid work model. You will collaborate across teams to build stable, user-centric applications used globally. 🗂️ Requirements: 7+ years experience in production React ecosystem applications, Strong proficiency in React and TypeScript, Commercial experience in web development, Experience translating requirements into wireframes and high-fidelity prototypes, Solid understanding of SDLC, Experience with front-end architecture and Design Patterns, Strong troubleshooting and problem-solving skills, Familiarity with CI/CD and DevOps practices 📃 Skills: React, TypeScript, JavaScript, HTML, CSS, SDLC, CI/CD, DevOps, UX, UI, Architecture, Prototyping, Wireframing, DesignPatterns 🏢 Description: Unleash innovation in front-end development — shape the future of seamless UI experiences! Krakow-based opportunity with hybrid work model (up to 3 remote days per week). As a Senior ReactJS UI Engineer – Front-End Architecture & UX Optimization , you will be working for our client, a leading technology company focused on delivering cutting-edge web applications. You will drive UI enhancements, architect scalable front-end solutions, and optimize user experience to ensure high performance and stability across platforms—contributing to innovative projects that impact users worldwide. Your main responsibilities: Lead UI enhancements and improvements to elevate overall UX and application stability Participate in designing robust front-end architecture aligned with best practices Implement solutions utilizing proven Design Patterns for scalable and maintainable code Analyze requirements thoroughly to suggest improvements and optimizations Manage changes effectively throughout the Service management lifecycle Develop and prototype application features to validate concepts and designs Provide prompt and effective support to address and resolve user issues Collaborate with cross-functional teams to deliver high-quality solutions You're ideal for this role if you have: 7+ years of professional experience in production React ecosystem applications, including UI/UX design Strong proficiency in React and TypeScript Web development Proven experience in translating product requirements into wireframes and high-fidelity prototypes Solid understanding of the Software Development Life Cycle (SDLC) Exceptional troubleshooting and problem-solving skills in high-pressure environments Familiarity with DevOps practices like CI/CD pipelines It is a strong plus if you have: (optional) Experience with modern UI design tools and frameworks Certifications related to React, TypeScript, or Front-End architecture Language Required for the role: Fluent English command, both written and spoken Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER

🏢 Summary: Front-end Engineer role focused on building and scaling React-based user interfaces for an internal GenAI and LLM-powered productivity platform. The position involves creating intuitive, high-performance UIs, integrating backend APIs, and delivering seamless AI-driven user experiences. This is a hybrid, full-time B2B contract role based in Krakow. 🗂️ Requirements: Commercial experience in front-end development, Proficiency in React.js, Strong knowledge of JavaScript (ES6+), Strong knowledge of CSS, Experience integrating REST or GraphQL APIs, Ability to handle asynchronous data flows, Strong UX/UI understanding, Knowledge of accessibility best practices, Knowledge of performance optimization, Experience with front-end testing practices 📃 Skills: React, JavaScript, ES6, CSS, Tailwind, CSS-in-JS, REST, GraphQL, APIs, UX, UI, Accessibility, Performance, Testing 🏢 Description: Krakow, Poland | Hybrid, 2 days/week Full‑time | B2B contract Shape the future of work with AI An internal GenAI & LLM‑powered productivity platform is already redefining how thousands of employees interact with intelligent tools. Now, we need you – a front‑end engineer with a passion for smooth, human‑centric interfaces – to bring these experiences to life. You won't just write components. You'll design and deliver React‑based UIs that make complex AI feel simple, intuitive, and even delightful. What you'll do Build responsive, high‑performance UIs that scale across devices and internal tools Rapidly prototype new features at the intersection of productivity and AI Collaborate closely with product managers and UX designers to turn research into polished interfaces Seamlessly integrate backend APIs (REST / GraphQL) into fluid front‑end experiences Champion modern front‑end best practices – accessibility, performance, maintainability, testing What you bring Must‑have: Solid commercial experience in front‑end development Deep proficiency in React.js, JavaScript (ES6+), and CSS (Tailwind / CSS‑in‑JS is a plus) Strong sense of UX/UI design – you notice the details others miss Experience integrating with backend APIs and handling asynchronous data flows Highly desirable: Previous work on AI / GenAI products or UX‑heavy applications (chat interfaces, copilots, creative tools, dashboards with complex interactions)

🏢 Summary: Senior Frontend Developer role focused on building and enhancing high-performance web applications using React and TypeScript, with strong emphasis on UI/UX quality. The position involves leading UI improvements, contributing to front-end architecture, and implementing scalable, maintainable solutions in a hybrid work model. You will drive user experience innovation while ensuring application stability and performance. 🗂️ Requirements: Minimum 5 years of experience with React in production environments, Strong proficiency in React and TypeScript, Experience in UI/UX design and prototyping, Ability to design scalable front-end architecture, Knowledge of SDLC processes, Experience with CI/CD practices, Fluent English, Legal right to work in the European Union 📃 Skills: React, TypeScript, JavaScript, HTML, CSS, UI, UX, SDLC, CI, CD, DevOps, REST, APIs, Wireframing, Prototyping 🏢 Description: Ignite innovative front-end solutions — shape the future of user experiences with cutting-edge React and TypeScript expertise. Krakow-based opportunity with hybrid work model (up to 3 remote days per week). As a Senior React & TypeScript Frontend Developer – UI/UX Focus , you will be working for our client, a forward-thinking tech company dedicated to delivering exceptional digital experiences. You will lead UI enhancements, participate in architecture design, and implement best-in-class solutions to elevate application usability and stability, playing a pivotal role in redefining user interactions and visual appeal. Your main responsibilities: Lead UI changes and improvements to enhance overall UX and application performance Participate in front-end architecture design to ensure scalable and maintainable solutions Implement solutions following best Design Patterns for robust application development Analyze requirements thoroughly to suggest improvements and optimizations Manage changes throughout the service management lifecycle effectively Develop and validate application prototypes to test concepts and designs Provide exceptional customer support by promptly addressing and resolving issues Communicate clearly with clients to understand needs and deliver tailored solutions You're ideal for this role if you have: A minimum of 5 years of experience in production applications development within the React ecosystem, including UI/UX design Strong proficiency in React and TypeScript for building dynamic, interactive, high-performance web applications Experience translating product requirements into wireframes and high-fidelity prototypes Familiarity with the Software Development Life Cycle (SDLC) — requirements gathering, design, development, testing, deployment, and maintenance Excellent problem-solving skills and meticulous attention to detail Experience with DevOps practices like continuous integration and continuous delivery It is a strong plus if you have: (optional) Certifications in React, TypeScript, or UI/UX design Experience with modern frontend testing frameworks Knowledge of back-end integration and RESTful APIs Language Required for the role: Fluent English Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER

🏢 Summary: Frontend Engineer role focused on building production-ready Next.js SSR applications that power enterprise AI interfaces at scale. The position involves architecting complex state management, real-time LLM streaming experiences, and high-performance data-heavy UIs integrated with enterprise systems. You will own features end-to-end, ensuring accessibility, security, and performance for mission-critical AI-driven workflows. 🗂️ Requirements: 5+ years frontend engineering experience, 3+ years experience with React and modern JavaScript/TypeScript, Production experience with Next.js SSR applications, Advanced TypeScript expertise, Experience with complex state management in real-time or multi-tenant applications, Experience building enterprise applications with i18n, accessibility, and security standards, Experience building AI/LLM interfaces with streaming or real-time interactions, Proven ability to optimize high-load, data-heavy applications, Strong expertise in modern CSS (Tailwind CSS or CSS-in-JS), Experience with observability and monitoring tools, Experience using AI coding assistants in development, Upper-Intermediate English proficiency 📃 Skills: React, Next.js, TypeScript, JavaScript, SWR, REST, WebSockets, Tailwind, CSS, Storybook, ReactFlow, Highcharts, Playwright, Datadog, Sentry, Elasticsearch, DynamoDB, PostgreSQL, Aurora, AI, LLM 🏢 Description: As a Frontend Engineer at Shelf, you’ll craft the interfaces that make enterprise AI accessible and trustworthy. While others are building chatbots, we’re solving the harder problem: how do you build UIs that help users confidently navigate AI-powered systems processing millions of documents, while maintaining enterprise-grade reliability? You won’t just build React components — you’ll architect production-ready Next.js applications that handle high-load scenarios with complex states, real-time AI streaming, and multiple layers of enterprise functionality. Every interface decision you make directly impacts how knowledge workers at the biggest companies in the market interact with their most critical information. This is frontend engineering at its most demanding. You’ll tackle challenges like building real-time streaming interfaces for LLM responses, architecting state management for concurrent AI operations across multiple tenants, creating accessible interfaces for complex knowledge graphs with thousands of nodes, and ensuring blazing fast interactions even with petabytes of searchable content. Your components will bridge everything from enterprise authentication systems to cutting-edge AI models, requiring both sophisticated technical skills and sharp product instincts. We obsess over frontend quality because we’re building the trust layer for AI itself. When your interfaces gracefully handle edge cases, provide clear feedback during AI processing, and remain performant under load, you’re not just meeting UX standards — you’re directly enabling users to trust AI-powered answers and make critical business decisions with confidence. You’ll work on production SSR applications serving thousands of enterprise users, implementing localization for global markets, ensuring accessibility compliance, and maintaining security standards that pass SOC 2 audits. Your code will integrate with our Elasticsearch clusters, DynamoDB tables, and Aurora PostgreSQL databases through the largest park of REST APIs, handling real-time websocket updates for AI streaming and collaborative features. We’re a product company that ships fast without compromising on lasting quality. You’ll work alongside proactive, ever-learning engineers who actively use AI coding assistants (OpenAI Codex, Claude Code) to accelerate development. We build custom MCP servers, implement DSPy pipelines for LLM optimization, and experiment with different AI tools for implementation. In our environment, AI isn’t just what we build — it’s how we build. The best engineers we know are drawn to problems that matter. If you’re excited by the challenge of building interfaces that make the AI revolution actually usable and trustworthy for enterprise users, this role offers the rare combination of technical depth, meaningful impact, and the prestige of solving UX patterns that the industry hasn’t figured out yet. Responsibilities Design and implement production-ready Next.js SSR applications with complex state management, handling high-load scenarios and real-time AI interactions at scale Build interfaces for AI-powered features including streaming LLM responses, semantic search across millions of documents, interactive knowledge graphs, intelligent content recommendations, and AI agentic builders Architect component libraries and maintain our design system in Storybook, ensuring reusability, accessibility, and consistent UX patterns across the platform Develop enterprise-grade functionality including multi-language support, accessibility compliance, cross-browser compatibility, and security implementations that meet SOC 2 standards Create comprehensive technical specifications and component API designs that clearly communicate interface decisions, performance trade-offs, and accessibility considerations Build and optimize data-heavy UIs using React Flow for node-based graphs, Highcharts for analytics visualizations, and custom virtualization for handling large datasets Instrument components for performance monitoring, track Core Web Vitals, implement error boundaries, and build automated visual regression tests with Playwright Take full ownership of the features you build, monitoring their performance in production, optimizing bundle sizes, and ensuring they scale gracefully as user load grows Work with SWR for intelligent data fetching, caching, and revalidation strategies that minimize API calls while keeping UIs responsive and data fresh Integrate with backend services via REST APIs, handle websocket connections for real-time updates, and implement optimistic UI patterns for seamless user experiences Leverage AI coding assistants to accelerate development while maintaining high code quality, and contribute to building internal AI agents that automate frontend workflows Stay current with React ecosystem best practices, Next.js updates, AI UX patterns, and modern frontend architecture—experiment with new approaches and share findings with the team Contribute to our engineering standards and practices through thoughtful code reviews, mentor colleagues on frontend best practices, and actively participate in our culture of continuous learning Requirements Over 5 years of professional frontend engineering experience, including more than 3 years specializing in React and modern JavaScript/TypeScript Production Next.js experience — you’ve built and shipped SSR applications at scale, understand app router patterns, server components, and the trade-offs between SSR, SSG, and CSR Deep TypeScript expertise — you write type-safe code with generics, utility types, and advanced patterns. Complex state management — hands-on experience architecting state solutions for challenging scenarios: real-time collaboration, optimistic updates, multi-tenant data isolation, and large-scale data synchronization Enterprise application development — you’ve built applications with localization (i18n), accessibility, security best practices, and compliance requirements. You understand the complexity beyond “making it work” AI/LLM interface experience — you’ve built interfaces for AI-powered features: streaming token responses, chat UIs, semantic search, or similar real-time AI interactions High-load optimization — proven track record optimizing applications for performance under heavy traffic, large datasets, and concurrent operations. You monitor Core Web Vitals and know how to improve them Modern CSS mastery — strong expertise with Tailwind CSS and/or CSS-in-JS solutions. You can implement pixel-perfect designs while maintaining responsive layouts and dark mode support Write well-structured, testable code with thoughtful component abstractions and clean APIs. You know when to abstract and when to keep it simple Strong problem-solving skills and genuine curiosity — you don’t wait for designs to be perfect but proactively identify UX issues and propose solutions. You’re never satisfied with “good enough” and constantly refine your craft Experience with AI coding assistants (OpenAI Codex, Claude, etc.) and eagerness to push the boundaries of AI-assisted development. Part of this role involves creating AI agents to automate portions of the frontend workflow Familiarity with observability and monitoring tools like Datadog, Sentry, or similar platforms for tracking frontend performance and errors in production Upper-Intermediate or better English skills for technical communication, documentation, and collaborating with distributed teams Present your work effectively both verbally and visually — you can articulate design decisions, create component documentation, and explain technical trade-offs clearly Be a Plus: Experience with React Flow, Highcharts, or other complex data visualization libraries Understanding of Node.js/Python/backend fundamentals — you can read backend code and contribute to API design discussions Experience with SWR, React Query, or similar data fetching libraries Hands-on experience with vector search UIs, RAG interfaces, or semantic search implementations Familiarity with MCP (Model Context Protocol), DSPy, or other cutting-edge AI frameworks Experience with monorepo tools (Lerna, Turborepo, Nx) and managing shared component libraries AWS services knowledge (S3, CloudFront, Lambda) and understanding of serverless architectures Built or contributed to design systems or open-source component libraries Experience with Playwright, Puppeteer, or Cypress for comprehensive E2E testing Experience building AI agent interfaces or agentic AI workflows What Shelf Offers: B2B contract Company Stock Options Hardware: MacBook Pro Modern technical stack. Develop open-source software Premier AI development environment: GitHub Copilot, Claude Code, OpenAI Codex, TypingMind, v0, MCP Servers, plus credits for experimenting with emerging AI tools Why Shelf GenAI will be at least a $18 Trillion market by 2032 and Shelf is a core infrastructure that enables GenAI to be deployed at scale We are blazing the path for the future of Artificial Intelligence globally. Our Leadership Team has deep AI domain expertise and enterprise SaaS background to execute this plan We love our customers and our customers love us. Ask a Shelf customer why, and they’ll tell you it’s because of our innovative capabilities, rock-solid reliability, they truly enjoy working with our people, but most of all — it’s the improvements they see in their business KPIs. We have raised over $60 million in funding and our investors include; Insight Partners, Tiger Global, Base10, and others We have high velocity growth powered by the most innovative product in our category We now have over 100 employees in multiple U.S. states and European countries, and we have ambitious hiring goals over the next few quarters.

🏢 Summary: Frontend Engineer role focused on building production-grade Next.js SSR applications that power enterprise AI interfaces with real-time LLM streaming, complex state management, and high-load performance. The position involves architecting scalable, accessible, and secure UIs integrated with AI systems and large-scale data services. It requires delivering performant, enterprise-ready frontend solutions for mission-critical AI-driven workflows. 🗂️ Requirements: 5+ years frontend engineering experience, 3+ years commercial experience with React, Production experience with Next.js SSR applications, Advanced TypeScript expertise, Experience with complex state management in large-scale applications, Experience building AI/LLM interfaces with real-time streaming, Proven performance optimization for high-load applications, Experience with enterprise features: i18n, accessibility, security compliance, Strong knowledge of modern CSS and responsive design, Experience integrating REST APIs and WebSockets, Experience with observability and frontend monitoring tools, Experience with AI coding assistants 📃 Skills: React, Next.js, TypeScript, JavaScript, SWR, REST, WebSockets, Tailwind, CSS, Storybook, ReactFlow, Highcharts, Playwright, Datadog, Sentry, Elasticsearch, DynamoDB, PostgreSQL, Aurora, SOC2 🏢 Description: As a Frontend Engineer at Shelf, you’ll craft the interfaces that make enterprise AI accessible and trustworthy. While others are building chatbots, we’re solving the harder problem: how do you build UIs that help users confidently navigate AI-powered systems processing millions of documents, while maintaining enterprise-grade reliability? You won’t just build React components — you’ll architect production-ready Next.js applications that handle high-load scenarios with complex states, real-time AI streaming, and multiple layers of enterprise functionality. Every interface decision you make directly impacts how knowledge workers at the biggest companies in the market interact with their most critical information. This is frontend engineering at its most demanding. You’ll tackle challenges like building real-time streaming interfaces for LLM responses, architecting state management for concurrent AI operations across multiple tenants, creating accessible interfaces for complex knowledge graphs with thousands of nodes, and ensuring blazing fast interactions even with petabytes of searchable content. Your components will bridge everything from enterprise authentication systems to cutting-edge AI models, requiring both sophisticated technical skills and sharp product instincts. We obsess over frontend quality because we’re building the trust layer for AI itself. When your interfaces gracefully handle edge cases, provide clear feedback during AI processing, and remain performant under load, you’re not just meeting UX standards — you’re directly enabling users to trust AI-powered answers and make critical business decisions with confidence. You’ll work on production SSR applications serving thousands of enterprise users, implementing localization for global markets, ensuring accessibility compliance, and maintaining security standards that pass SOC 2 audits. Your code will integrate with our Elasticsearch clusters, DynamoDB tables, and Aurora PostgreSQL databases through the largest park of REST APIs, handling real-time websocket updates for AI streaming and collaborative features. We’re a product company that ships fast without compromising on lasting quality. You’ll work alongside proactive, ever-learning engineers who actively use AI coding assistants (OpenAI Codex, Claude Code) to accelerate development. We build custom MCP servers, implement DSPy pipelines for LLM optimization, and experiment with different AI tools for implementation. In our environment, AI isn’t just what we build — it’s how we build. The best engineers we know are drawn to problems that matter. If you’re excited by the challenge of building interfaces that make the AI revolution actually usable and trustworthy for enterprise users, this role offers the rare combination of technical depth, meaningful impact, and the prestige of solving UX patterns that the industry hasn’t figured out yet. Responsibilities Design and implement production-ready Next.js SSR applications with complex state management, handling high-load scenarios and real-time AI interactions at scale Build interfaces for AI-powered features including streaming LLM responses, semantic search across millions of documents, interactive knowledge graphs, intelligent content recommendations, and AI agentic builders Architect component libraries and maintain our design system in Storybook, ensuring reusability, accessibility, and consistent UX patterns across the platform Develop enterprise-grade functionality including multi-language support, accessibility compliance, cross-browser compatibility, and security implementations that meet SOC 2 standards Create comprehensive technical specifications and component API designs that clearly communicate interface decisions, performance trade-offs, and accessibility considerations Build and optimize data-heavy UIs using React Flow for node-based graphs, Highcharts for analytics visualizations, and custom virtualization for handling large datasets Instrument components for performance monitoring, track Core Web Vitals, implement error boundaries, and build automated visual regression tests with Playwright Take full ownership of the features you build, monitoring their performance in production, optimizing bundle sizes, and ensuring they scale gracefully as user load grows Work with SWR for intelligent data fetching, caching, and revalidation strategies that minimize API calls while keeping UIs responsive and data fresh Integrate with backend services via REST APIs, handle websocket connections for real-time updates, and implement optimistic UI patterns for seamless user experiences Leverage AI coding assistants to accelerate development while maintaining high code quality, and contribute to building internal AI agents that automate frontend workflows Stay current with React ecosystem best practices, Next.js updates, AI UX patterns, and modern frontend architecture—experiment with new approaches and share findings with the team Contribute to our engineering standards and practices through thoughtful code reviews, mentor colleagues on frontend best practices, and actively participate in our culture of continuous learning Requirements Over 5 years of professional frontend engineering experience, including more than 3 years specializing in React and modern JavaScript/TypeScript Production Next.js experience — you’ve built and shipped SSR applications at scale, understand app router patterns, server components, and the trade-offs between SSR, SSG, and CSR Deep TypeScript expertise — you write type-safe code with generics, utility types, and advanced patterns. Complex state management — hands-on experience architecting state solutions for challenging scenarios: real-time collaboration, optimistic updates, multi-tenant data isolation, and large-scale data synchronization Enterprise application development — you’ve built applications with localization (i18n), accessibility, security best practices, and compliance requirements. You understand the complexity beyond “making it work” AI/LLM interface experience — you’ve built interfaces for AI-powered features: streaming token responses, chat UIs, semantic search, or similar real-time AI interactions High-load optimization — proven track record optimizing applications for performance under heavy traffic, large datasets, and concurrent operations. You monitor Core Web Vitals and know how to improve them Modern CSS mastery — strong expertise with Tailwind CSS and/or CSS-in-JS solutions. You can implement pixel-perfect designs while maintaining responsive layouts and dark mode support Write well-structured, testable code with thoughtful component abstractions and clean APIs. You know when to abstract and when to keep it simple Strong problem-solving skills and genuine curiosity — you don’t wait for designs to be perfect but proactively identify UX issues and propose solutions. You’re never satisfied with “good enough” and constantly refine your craft Experience with AI coding assistants (OpenAI Codex, Claude, etc.) and eagerness to push the boundaries of AI-assisted development. Part of this role involves creating AI agents to automate portions of the frontend workflow Familiarity with observability and monitoring tools like Datadog, Sentry, or similar platforms for tracking frontend performance and errors in production Upper-Intermediate or better English skills for technical communication, documentation, and collaborating with distributed teams Present your work effectively both verbally and visually — you can articulate design decisions, create component documentation, and explain technical trade-offs clearly Be a Plus: Experience with React Flow, Highcharts, or other complex data visualization libraries Understanding of Node.js/Python/backend fundamentals — you can read backend code and contribute to API design discussions Experience with SWR, React Query, or similar data fetching libraries Hands-on experience with vector search UIs, RAG interfaces, or semantic search implementations Familiarity with MCP (Model Context Protocol), DSPy, or other cutting-edge AI frameworks Experience with monorepo tools (Lerna, Turborepo, Nx) and managing shared component libraries AWS services knowledge (S3, CloudFront, Lambda) and understanding of serverless architectures Built or contributed to design systems or open-source component libraries Experience with Playwright, Puppeteer, or Cypress for comprehensive E2E testing Experience building AI agent interfaces or agentic AI workflows What Shelf Offers: B2B contract Company Stock Options Hardware: MacBook Pro Modern technical stack. Develop open-source software Premier AI development environment: GitHub Copilot, Claude Code, OpenAI Codex, TypingMind, v0, MCP Servers, plus credits for experimenting with emerging AI tools Why Shelf GenAI will be at least a $18 Trillion market by 2032 and Shelf is a core infrastructure that enables GenAI to be deployed at scale We are blazing the path for the future of Artificial Intelligence globally. Our Leadership Team has deep AI domain expertise and enterprise SaaS background to execute this plan We love our customers and our customers love us. Ask a Shelf customer why, and they’ll tell you it’s because of our innovative capabilities, rock-solid reliability, they truly enjoy working with our people, but most of all — it’s the improvements they see in their business KPIs. We have raised over $60 million in funding and our investors include; Insight Partners, Tiger Global, Base10, and others We have high velocity growth powered by the most innovative product in our category We now have over 100 employees in multiple U.S. states and European countries, and we have ambitious hiring goals over the next few quarters.