Senior AI Fullstack Engineer (Next.js & LLM)

🏢 Summary: Frontend role focused on building and maintaining modern React and Next.js applications enhanced with generative AI capabilities. The position involves integrating LLM-powered features into production systems and collaborating directly with enterprise clients on AI platform solutions. It combines advanced frontend engineering with practical AI implementation in real-world environments. 🗂️ Requirements: 3–5 years commercial experience with React, Next.js, TypeScript, Strong knowledge of Next.js including App Router, Understanding of React Server Components and Server Actions, Experience building and maintaining production-grade web applications, Experience integrating AI-powered features into applications, Hands-on experience with OpenAI or Anthropic APIs, Knowledge of streaming responses, structured outputs, tool calling, prompt engineering, Experience with Git and CI/CD workflows, Experience with AI-assisted development tools, Fluent English (C1+) 📃 Skills: React, Next.js, TypeScript, JavaScript, OpenAI, Anthropic, LLM, Git, CI/CD, AppRouter, RSC, ServerActions, PromptEngineering, Vercel, MCP, RAG 🏢 Description: Frontend React/Next.js Developer with AI Mindset About Blazity At Blazity, we are a team of AI engineering experts building AI-powered products, agents, and intelligent workflows on top of modern web technologies. We partner with enterprise clients as trusted technology advisors, helping them build scalable products that combine exceptional user experiences with cutting-edge AI capabilities. We believe the best frontend engineers today are AI-native engineers. They don't just use AI tools to write code — they understand how AI products work, how LLM-powered features are designed, and how to deliver reliable experiences for real users. We're looking for a Frontend React/Next.js Developer with an AI mindset who wants to work on products at the intersection of modern frontend engineering and generative AI. About the Project You'll join a team working with a leading enterprise AI platform helping organizations evaluate, monitor, and improve the reliability and performance of AI systems deployed in production environments. This is a client-facing role. You'll collaborate directly with client engineers, product teams, and stakeholders while helping deliver business-critical solutions. Excellent communication skills and fluent English are essential, as you'll participate in technical discussions and day-to-day collaboration with international teams. Must-have Technical Skills 3–5 years of commercial experience building applications with React, Next.js, and TypeScript. Strong understanding of modern Next.js development, including App Router. Good understanding of React Server Components and Server Actions. Experience building and maintaining production-grade web applications. Experience integrating AI-powered functionality into products. Hands-on experience with OpenAI and/or Anthropic APIs. Familiarity with: streaming responses, structured outputs, tool calling, prompt engineering fundamentals. Experience working with Git and modern CI/CD workflows. Experience using AI-assisted development tools such as Claude Code, Cursor, Windsurf, GitHub Copilot, or similar. Soft Skills Strong communication skills and active listening. Ability to work directly with clients and stakeholders. Ownership mindset and proactive approach to problem-solving. Ability to collaborate effectively within cross-functional teams. Adaptability and willingness to learn new technologies. English at C1 level or higher (written and spoken). Nice-to-Have Experience with Vercel AI SDK. Experience with MCP (Model Context Protocol). Exposure to Agent SDKs. Experience building RAG-based solutions. Previous experience in consulting environments. What You Will Do Build Modern Applications Develop and maintain scalable applications using React, Next.js, and TypeScript. Deliver high-quality, maintainable, and performant frontend solutions. Collaborate with designers, engineers, and product stakeholders. Build AI-Powered Features Integrate OpenAI and Anthropic models into production applications. Develop AI-powered workflows and user experiences. Implement streaming, tool usage, and structured outputs. Collaborate with Clients Participate in technical discussions and project workshops. Work directly with client stakeholders and engineering teams. Help translate business requirements into technical solutions. Grow as an AI Engineer Learn modern AI engineering practices from experienced team members. Gain hands-on experience building real-world AI-powered products. Contribute to projects at the forefront of AI adoption. What Makes Us Special? 📈 Our team has a genuine impact on the company’s decisions and direction. ✨ No bureaucracy – we keep things simple and efficient. 🗺️ 100% remote work from Poland. ⏳ Flexible working hours. 🤝 Open communication and continuous feedback. 🏥 Health insurance fully covered by us. 🏃 Sports card fully covered by us. 🌴 29 paid days off. 🍕 Team gatherings and social events. Employment Details B2B: 80–120 PLN net + VAT / hour Location: 100% remote from Poland

🏢 Summary: Forward-Deployed AI Engineer role focused on leading Next.js frontend migrations and delivering production-grade AI solutions for enterprise clients. The position combines hands-on TypeScript development, architectural optimization, and implementation of LLM-powered and agentic systems. The engineer works directly with client teams to modernize platforms and enable scalable, high-performance applications. 🗂️ Requirements: 5+ years of software engineering experience, 2+ years in customer-facing technical role, Expert-level TypeScript proficiency, Deep knowledge of Next.js and React ecosystem, Experience with SSR, SSG, and Server Components, Production experience with LLMs and AI workflows, Experience leading frontend migrations, Ability to conduct code audits and performance optimization, Experience building production-ready applications 📃 Skills: TypeScript, JavaScript, Next.js, React, LLMs, AI, SSR, SSG, ISR, Node.js, APIs, Edge, Streaming 🏢 Description: About Blazity Blazity is a team of React.js and Next.js experts building modern, API-first digital products. We partner with enterprise clients as trusted technology advisors, delivering solutions that span complex web platforms, e-commerce ecosystems, and custom software products. Recently, we’ve been expanding our AI capabilities—autonomous agents, AI-driven automation, and LLM-powered workflows—helping companies unlock operational efficiency and innovate at scale. About the Role We’re looking for a Forward-Deployed AI Engineer to work directly with our enterprise clients, helping them modernize frontend systems, implement AI solutions, and transform workflows. You’ll be hands-on, building production-ready systems, guiding migrations, and helping clients realize measurable business outcomes. What You’ll Do Lead complex frontend migrations to Next.js, modernizing legacy React, Vue, or other frameworks. Conduct technical assessments and code audits—analyzing performance bottlenecks, architectural anti-patterns, and optimization opportunities. Architect and implement high-performance applications leveraging Next.js, Server Components, streaming, ISR, edge functions, and advanced rendering strategies. Build production AI solutions, including agentic workflows, autonomous agents, and LLM-powered systems. Work directly with client teams to develop production-ready TypeScript code and train client engineers to maintain and extend the solutions. Drive enablement through workshops, pair programming, and documentation. Participate in pre-sales and solution scoping, providing technical expertise for migrations, AI transformations, and audits. Contribute reusable patterns, libraries, and best practices to Blazity’s internal AI and frontend tooling. About You: 5+ years of software engineering experience, including 2+ years in a customer-facing technical role (consulting, solutions engineering, forward-deployed engineering, or technical founder experience). Expert in TypeScript and comfortable shipping production code daily. Deep knowledge of Next.js and React ecosystem, including migrations, SSR/SSG, Server Components, and performance optimization. Production experience with LLMs, AI SDKs, and agentic workflows. High agency, comfortable in ambiguity, and able to navigate complex enterprise environments. Strong consulting and communication skills—able to translate technical capabilities into business value. Bonus Points: Experience leading enterprise AI transformation initiatives. Familiarity with multi-agent orchestration, tool calling, or Model Context Protocol (MCP). Contributions to open-source Next.js, React, or AI SDK projects. Enterprise deployment experience, including security, compliance, and multi-region architectures. What we offer 💼 B2B contract with competitive rate 🌍 100% remote work 🚀 High-impact, hands-on role delivering cutting-edge AI solutions for enterprise clients 🧠 Collaboration with senior engineers, founders, and client teams shaping AI capabilities 🌴 29 paid vacation days 🏥 Private medical insurance fully covered 🏋️ Fully paid sports card Salary ranges B2B: 100-120 zł/h + VAT Location 100% Remote from Poland

🏢 Summary: Senior Fullstack Engineer role focused on delivering full-stack solutions within an AI-integrated SDLC where AI is embedded across planning, development, review, testing, and deployment. The position combines backend and frontend engineering with AI orchestration, automation, and cloud-native architecture in a remote-first setup. The engineer will also evolve shared AI toolchains and contribute to architectural and code quality standards. 🗂️ Requirements: Team-level AI-integrated SDLC experience across planning, development, review, testing, deployment, Shared AI toolchain management under version control, Hands-on use of Claude Code, GitHub Copilot, Cursor or equivalent as team tools, Building and maintaining custom AI skills and sub-agents for team use, Experience with parallel AI agent orchestration, Spec-driven development using OpenAPI, ADRs, PRDs as AI context, AI-assisted code review integrated into PR process, Working knowledge of AI orchestration frameworks, Backend development with .NET / C# and ASP.NET Core, Frontend development with TypeScript and React or Angular, Experience with SQL databases and ORM frameworks, Experience with Docker and Kubernetes, Experience with CI/CD pipelines, Experience with cloud platforms (Azure, AWS, or GCP) 📃 Skills: C#, .NET, ASP.NET, SQL, SQLServer, PostgreSQL, EFCore, OAuth, JWT, Python, Java, Node.js, TypeScript, JavaScript, React, Angular, LangChain, LlamaIndex, CrewAI, Docker, Kubernetes, GitHubActions, AzureDevOps, Azure, AWS, GCP, OpenAPI, CQRS, DDD, EventSourcing, Microservices 🏢 Description: We are looking for a Senior Fullstack Engineer who combines deep technical expertise with real, team-level experience working in an AI-integrated software development lifecycle. Individual use of AI coding assistants is not sufficient for this role. We are specifically looking for engineers who have worked in teams where AI was embedded into every phase of delivery — from planning and design through development, review, testing, and deployment. We follow a remote-first setup with no mandatory regular office visits for this position. From time to time, you may be invited to join in-person meetings in one of our offices (Warsaw, Lodz, Wroclaw, Gdansk, or Bialystok), for example for client visits or team reunions. AI-First Requirements Experience working in an AI-enabled engineering team is mandatory — not a personal workflow preference. You have been part of a team where AI was systematically embedded across all delivery phases: planning, development, review, testing, and deployment. You can speak from direct experience about how it worked, what failed, and what you would change. Specific mandatory requirements: Team-level AI-integrated SDLC experience — shared toolchain, shared configurations, shared assets under version control Hands-on with Claude Code, GitHub Copilot, Cursor, or equivalent as a team tool, not only personal usage Built and maintained custom skills and sub-agents used across a team, not just personally Experience with parallel agent orchestration for concurrent workstream execution Disciplined plan → review plan → execute approach with AI involved at every phase Maintained shared prompt libraries, skill repositories, or agent configurations in version control AI-assisted code review integrated into the PR process: CodeRabbit, Copilot review, or similar Experience with spec-driven or document-driven development where structured specifications (OpenAPI, ADRs, PRDs) serve as AI context inputs, not just human references Working knowledge of at least one AI orchestration framework: LangChain, LlamaIndex, Microsoft Agent Framework, CrewAI, or equivalent Automation-first mindset: proactively identify repetitive or inefficient parts of current work and automate them using AI and other available tools. Cost-aware AI usage: understanding how AI credits are consumed across different tools, models, and workflows, and ability to choose the most appropriate model or approach for each task. Technical Requirements Backend: .NET / C#, ASP.NET Core, SQL Server / PostgreSQL, EF Core, OAuth 2.0 / JWT. Python, Java, or Node.js is a strong plus. Frontend: TypeScript, JavaScript, React(preferable) and/or Angular, state management, async patterns, frontend testing. Architecture: Full spectrum from monolith to microservices — DDD, CQRS, Event Sourcing, event-driven design, message brokers. Infrastructure: Docker, Kubernetes, CI/CD (GitHub Actions / Azure DevOps), Azure / AWS / GCP, structured observability. Responsibilities Deliver full-stack features to a high standard of quality, performance, and reliability Contribute to architectural decisions and system design trade-offs Evolve and maintain the team's shared AI toolchain across all SDLC phases Conduct code reviews including AI-assisted tooling; uphold and enforce engineering best practices Proactively surface risks, bottlenecks, and security concerns Communicate and collaborate directly with clients in English Mentor engineers on both technical fundamentals and AI-augmented workflow practices Professional Qualities Ownership mindset · Strong written and verbal English · Comfortable in client-facing roles · Raises the AI workflow maturity of those around them

🏢 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: Senior Full Stack Engineer role focused on building and owning end-to-end product features for an AI-driven platform that automates complex business processes. The position involves developing frontend and backend solutions, designing APIs, improving performance and usability, and leveraging AI tools in daily engineering work. The role is office-based in Warsaw and requires strong product thinking and production-level experience. 🗂️ Requirements: Senior-level experience building production web applications, Strong knowledge of React and TypeScript or similar frontend framework, Experience designing and developing backend APIs and application logic, Ability to build and maintain frontend and backend features end-to-end, Experience working with production environments and monitoring released features, Daily use of AI tools for development and problem-solving, Strong understanding of code quality, testing, and long-term ownership 📃 Skills: React, TypeScript, JavaScript, API, REST, Node.js, Python, GitHub, Copilot, Claude, OpenAI, Codex, TypingMind, MCP, AI 🏢 Description: About Us Many companies want to use AI agents, but these agents often have problems with complex business tasks. We help solve this issue. Our platform understands company rules, processes, and workflows, so AI can make better decisions instead of only giving simple answers. This allows businesses to use AI that is accurate, follows company policies, and can be trusted. Well-known companies use our technology to automate up to 85% of customer cases, reduce handling time by 20–25%, and complete tasks that used to take hours in just a few seconds. We work with leading technology partners and have received industry recognition for our innovative approach. Our mission is to give people better answers everywhere. About the Role We are looking for a Senior Full Stack Engineer with strong product thinking. In this role, you will own features from start to finish. You will understand user needs, plan solutions, build frontend and backend functionality, release new features, and improve them based on user feedback. You should feel comfortable working on user interfaces, APIs, and production quality while collaborating with product and design teams. Location: Warsaw (office-based). Responsibilities Build and deliver product features across both frontend and backend. Turn product ideas into practical and effective solutions. Work with user interfaces, business logic, APIs, and data flows. Cooperate closely with product managers and designers, even when requirements are still developing. Improve usability, performance, reliability, and overall user experience. Monitor released features and use production data to make improvements. Use AI tools every day to work faster and improve engineering processes. Maintain high standards for code quality, testing, and long-term ownership. Requirements Strong experience as a senior engineer building production web applications. Good knowledge of React, TypeScript, or a similar modern frontend framework. Experience designing and developing backend APIs and application logic. Strong product mindset with the ability to identify and improve weak user experiences. Good decision-making skills when balancing scope, speed, and technical quality. Clear communication and teamwork across engineering, product, and design. Daily experience using AI tools for development and problem-solving. Nice to Have Experience building AI-powered products such as chat, search, recommendation systems, workflows, or AI agents. Knowledge of Python, Node.js, or both. Experience owning product areas independently. Understanding of performance optimization, accessibility, and high-quality web applications. What We Offer B2B contract and company stock options. MacBook Pro for work. Modern technology stack with opportunities to contribute to open-source projects. Advanced AI development tools, including GitHub Copilot, Claude Code, OpenAI Codex, TypingMind, and MCP Servers. Why Join Us Our leadership team has strong experience in knowledge management and AI. We have raised more than $60 million in funding and achieved three years of continuous 3x growth. Our work is guided by these core values: Quality: We aim for excellent craftsmanship and high standards in everything we build. Momentum: We take initiative and keep projects moving forward. Accountability: We take responsibility, give honest feedback, and support each other. Hard Work: We believe difficult goals require dedication and teamwork. Learning Agility: We stay curious, learn from mistakes, and keep improving. Adapt and Thrive: We accept change and see challenges as opportunities. Win Together: We succeed as a team through honesty, openness, and shared commitment.

🏢 Summary: Senior Frontend React Developer role focused on building scalable Next.js applications that power enterprise AI interfaces, including chat, semantic search, and knowledge graph features. The position involves developing high-performance, real-time, and data-intensive user interfaces with strong emphasis on accessibility, security, and code quality. You will contribute to reusable design systems, performance optimization, and AI-assisted development in a modern tech stack. 🗂️ Requirements: 5+ years frontend development experience, 3+ years experience with React, Strong knowledge of JavaScript, Strong knowledge of TypeScript, Strong knowledge of Next.js including SSR, App Router, Server Components, Advanced TypeScript skills, Experience with modern CSS solutions (Tailwind CSS or CSS-in-JS), Experience with complex state management, Experience with real-time collaboration features, Experience building AI-related interfaces (chat, streaming, semantic search), Understanding of localization, Understanding of accessibility standards, Understanding of security standards, Experience with AI coding tools (OpenAI Codex or Claude), Upper-Intermediate (B2) English or higher 📃 Skills: React, Next.js, JavaScript, TypeScript, SSR, Tailwind, CSS-in-JS, SWR, WebSockets, ReactFlow, Highcharts, Storybook, Playwright, Node.js, Python, AWS, S3, CloudFront, Lambda, OpenAI, Claude, Codex, Copilot, Puppeteer, Cypress, Lerna, Turborepo, Nx, MCP, DSPy 🏢 Description: About Us Many companies want to use AI agents, but these tools often have problems with real business tasks. We create a platform that helps AI understand company rules, workflows, and processes, so it can give correct and reliable answers. Our technology is trusted by large international companies and works with leading AI and cloud platforms. Our goal is to help people find better answers and make better decisions with AI. Senior Frontend React Developer As a Frontend React Developer, you will build modern user interfaces that make enterprise AI easy to use and reliable. You will create Next.js applications that work with large amounts of data, real-time AI responses, and advanced business features. Your work will help thousands of users access important information quickly and confidently. What You Will Do Design and develop scalable Next.js SSR applications. Build interfaces for AI chat, semantic search, knowledge graphs, and AI builders. Create data visualizations using libraries such as React Flow and Highcharts. Develop multilingual, accessible, secure, and cross-browser compatible applications. Work with SWR for data fetching, caching, and real-time websocket updates. Build and maintain reusable UI components and a Storybook design system. Improve application performance, monitor Core Web Vitals, and write automated tests with Playwright. Use AI coding assistants to speed up development while keeping high code quality. Participate in code reviews, share knowledge, and support continuous learning within the team. Requirements At least 5 years of frontend development experience. More than 3 years of experience with React and JavaScript/TypeScript. Strong knowledge of Next.js, including SSR, App Router, and Server Components. Advanced TypeScript skills and experience with modern CSS solutions such as Tailwind CSS or CSS-in-JS. Experience building applications with complex state management, real-time collaboration, and high performance. Experience creating interfaces for AI features such as chat systems, streaming responses, or semantic search. Understanding of localization, accessibility, security standards, and writing maintainable code. Experience using AI coding tools such as OpenAI Codex or Claude. Upper-Intermediate (B2) or higher English communication skills. Nice to Have Experience with React Flow, Highcharts, or similar visualization libraries. Basic backend knowledge in Node.js or Python and experience discussing API design. Experience with vector search, RAG interfaces, or semantic search solutions. Familiarity with MCP, DSPy, or other AI frameworks. Experience with monorepo tools such as Lerna, Turborepo, or Nx. Knowledge of AWS services like S3, CloudFront, and Lambda. Experience with Playwright, Puppeteer, or Cypress. What We Offer B2B contract and company stock options. MacBook Pro for work. Modern technology stack and opportunities to contribute to open-source projects. Access to advanced AI development tools, including GitHub Copilot, Claude Code, OpenAI Codex, TypingMind, v0, MCP Servers, and credits for testing new AI technologies. Our Values We believe our success comes from the way we work together: Quality – We aim for excellent work and high standards in everything we do. Momentum – We take initiative and keep projects moving forward. Accountability – We take responsibility and give honest, respectful feedback. Hard Work – We solve difficult problems together and stay committed to our goals. Learning – We are curious, improve every day, and learn from mistakes. Adaptability – We accept change and see challenges as opportunities. Teamwork – We communicate openly, support each other, and succeed as one team.

🏢 Summary: Junior AI Developer role focused on building and integrating LLM-based features, simple AI workflows, and early-stage agent systems in real-world production projects. The position emphasizes hands-on experimentation with AI tools and using web technologies as a foundation for developing intelligent systems. It is designed for students or early-career developers with practical experience in AI experimentation. 🗂️ Requirements: Active use of agentic coding tools (Claude, Codex, Cursor), Hands-on experimentation with LLMs (chatbots, automation, structured outputs), Understanding of LLM concepts and AI feature development, Knowledge of JavaScript or TypeScript, Knowledge of React or Next.js, Understanding of REST APIs, Experience integrating LLM APIs, Ability to design and iterate prompts, English C1 level 📃 Skills: JavaScript, TypeScript, React, Next.js, REST, APIs, LLM, OpenAI, Anthropic, Prompting, Git, Claude, Codex, Cursor 🏢 Description: About the Role At Blazity, we are building modern web applications and rapidly expanding into AI-powered systems — agents, automation, and LLM-based workflows . We are looking for a high-potential Junior AI Developer (student or early career) who is strongly interested in AI and LLMs , actively experiments with them, and wants to turn that into real-world, production experience. This is not a standard frontend role — this is an AI-first position , where web development is a tool to build intelligent systems. Our requirements AI-first mindset You actively use agentic coding tools like: Claude Code / Codex / Cursor You have experimented with AI , e.g.: building a chatbot automating tasks with LLMs generating structured outputs You are curious: how LLMs work how to build real AI features (not just use them) This role is for people who already do things with AI, not just read about it. Technical foundations Knowledge of: JavaScript / TypeScript React or Next.js (even small projects) Understanding of APIs (REST basics) Learning mindset You learn by building (projects > theory) You are comfortable making mistakes and iterating You are proactive and self-driven Big plus First experience with: OpenAI / Anthropic APIs prompt engineering (structured output, few-shot) You built: small AI apps (chatbot, automation, AI tool) GitHub projects showing AI experiments Participation in hackathons (especially AI-related) Other English C1 What You Will Do Work on real AI features Support development of: LLM-based features simple AI workflows early-stage agent-like systems Help with: prompt design and iteration testing and improving AI outputs building simple integrations with LLM APIs What we offer Hands-on experience with real AI systems in production Work with experienced engineers building AI solutions Fast growth path toward AI Engineer role Opportunity to work on real client projects (not toy problems) Location 100% remote from Poland

🏢 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 Fullstack Engineer role focused on building and maintaining production-grade, API-driven systems with AI-first development as a mandatory part of the workflow. The position involves designing scalable architectures, developing robust backend and frontend solutions, and critically evaluating AI-generated code. This is a hybrid, senior-level role requiring strong system design expertise and daily use of AI tools. 🗂️ Requirements: Senior-level experience in software engineering, Strong knowledge of JavaScript and TypeScript, Strong experience with Node.js and modern runtimes, Hands-on experience with React, Hands-on experience with Vue, Practical experience designing and integrating APIs, Strong understanding of software architecture and system design, Daily use of AI-assisted development tools, Ability to review and validate AI-generated code, On-site availability in Warsaw, Fluency in English 📃 Skills: JavaScript, TypeScript, Node.js, Bun, React, Vue, APIs, REST, Cursor, Copilot, ChatGPT 🏢 Description: Senior Fullstack Engineer (AI-First, Hybrid) Location: Warsaw, Poland 📍About the role: We are looking for a highly experienced Fullstack Engineer who builds real production systems and actively works with AI as a core part of their daily development workflow . This is not a remote role and not a junior or mid-level position. You will work on complex, API-driven systems where architecture, correctness, scalability, and long-term maintainability matter. Using AI for coding, design, refactoring, and problem-solving ( vibe coding ) is a hard requirement , not a nice-to-have. 📝What you will do: Design, develop, and evolve backend and frontend systems used in production Build, extend, and maintain robust APIs (both consuming external APIs and developing internal/public ones) Work daily with AI-assisted development tools as an integral part of your workflow Make architectural decisions with a focus on scalability, performance, and reliability Write clean, maintainable, well-structured code with long-term ownership in mind Collaborate closely with other engineers and product stakeholders in an on-site team Review, validate, and improve AI-generated code to ensure correctness, security, and performance 📝Must-have requirements: Strong, proven experience in software engineering (senior-level or higher) Excellent knowledge of: ○ JavaScript and TypeScript ○ Node.js and modern runtimes such as Bun Solid hands-on experience with both React and Vue Deep, practical experience working with APIs: ○ designing APIs ○ extending existing APIs ○ integrating third-party APIs Strong understanding of software architecture and system design High standards for code quality, readability, and maintainability Excellent command of AI-assisted development: ○ daily use of tools such as Cursor, Copilot, ChatGPT, or similar ○ ability to critically assess AI output instead of blindly accepting it ○ using AI for refactoring, debugging, testing, documentation, and exploration Comfortable working in an English-speaking environment 💎Nice to have Experience with DevOps , infrastructure, or production operations Experience working on high-traffic or business-critical systems Background in designing systems that evolve over time rather than one-off projects 📝Important notes AI-first development is a condition of employment We are looking for engineers who think in systems , not just frameworks We offer work on a modern application, A close-knit, experienced, and supportive team, private medical care and sports card If you prefer remote-only work or do not actively use AI in your daily coding, this role is not a good fit.

🏢 Summary: Senior Full Stack Engineer role focused on building AI-powered enterprise product features across frontend and backend systems in a fully onsite Warsaw office. The position involves owning the full development lifecycle, collaborating with product and design teams, and improving performance, reliability, and user experience. The company offers a modern AI-focused engineering environment, B2B contract, stock options, and opportunities to work with enterprise-scale AI solutions. 🗂️ Requirements: Senior-level experience building production web applications, Frontend experience with React, Frontend experience with TypeScript or similar frameworks, Backend experience designing APIs and backend services, Experience working with full-stack architectures and data flows, Ability to make technical decisions balancing scope, quality, and delivery time, Security-focused mindset and experience handling sensitive data, Experience collaborating with engineering, product, and design teams, Experience using AI tools in software development workflows, Availability to work onsite in Warsaw 5 days a week 📃 Skills: React, TypeScript, Python, Node.js, APIs, AI, Claude, OpenAI, Codex, GitHub, Copilot 🏢 Description: 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 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 and HIPAA-ready security practices and strong integrations. Job description We are looking for a Senior Full Stack Engineer who enjoys building complete product solutions from start to finish. In this role, you will understand customer needs, design the right technical solution, build new features, and improve them after release. You will work across both frontend and backend, taking ownership of the whole development process — from the first idea to production. The position is based in Warsaw and requires working from the office. Responsibilities - Build and deliver product features across both frontend and backend. - Turn product ideas into practical technical solutions with the right scope and priorities. - Work across the full technology stack, including user interfaces, backend logic, APIs, and data flows. - Work closely with product managers and designers, even when requirements are still changing. - Improve usability, performance, reliability, and overall product quality. - Monitor applications after release, analyze logs and system data, and continue improving the product. - Use AI tools every day to improve development speed, workflows, and engineering processes. - Maintain high standards for code quality, testing, and long-term ownership. Requirements - Strong senior-level experience building and delivering production web applications. - Strong frontend skills with React, TypeScript, or a similar modern web framework. - Good backend experience designing APIs, backend services, and data flows. - Strong product thinking with the ability to improve user experience and simplify complex workflows. - Good judgment when making technical decisions and balancing scope, quality, and delivery time. - A security-focused approach and experience handling sensitive data. - Good communication skills and experience working with engineering, product, and design teams. - Experience using AI tools as part of your daily software development work. Nice to have - Experience building AI-powered products such as chat applications, search, recommendation systems, workflows, or AI agents. - Experience with Python, Node.js, or both. - Experience leading product areas with a high level of ownership. - Good understanding of web performance, accessibility, and production quality. 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.