Senior Frontend Developer (JavaScript, React & Native iOS Mobile)

🏢 Summary: Senior Frontend Developer role focused on leading the architecture and development of AI-enabled web and iOS applications, owning the full frontend layer from design to production. The position involves building scalable React applications and native iOS apps, integrating with backend services, and driving performance, testing, and CI/CD standards. The role combines hands-on development with architectural leadership and mentoring responsibilities. 🗂️ Requirements: 6+ years of professional frontend development experience, Expert-level JavaScript and TypeScript, Expert-level React including hooks and state management, Strong native iOS development experience with Swift and SwiftUI, Experience integrating frontend applications with REST APIs, Knowledge of OAuth2 and JWT authentication mechanisms, Experience with frontend testing frameworks, Experience with frontend build tools, Ability to define frontend architecture and technical standards, Experience working with CI/CD pipelines 📃 Skills: JavaScript, TypeScript, React, Redux, Zustand, Swift, SwiftUI, UIKit, REST, OAuth2, JWT, CSS, Tailwind, StyledComponents, Emotion, Vite, Webpack, Jest, Vitest, Playwright, Cypress, XCTest, Fastlane, Xcode, Claude, CI/CD 🏢 Description: About Webellian Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy. About the position As a Senior Frontend Developer within Advanced Analytics, you will lead the design and development of user-facing AI-enabled products across web and mobile platforms. You will own the frontend layer of production applications — building sophisticated React-based web interfaces and native iOS mobile experiences that bring AI capabilities directly to end users across the globe. Key responsibilities: Architect and build production-grade React web applications: component design, state management, routing, performance optimization, and accessibility (WCAG compliance). Develop native iOS applications using Swift and SwiftUI (or UIKit where required), delivering high-quality, App Store-ready mobile experiences. Define and enforce frontend architecture standards: folder structure, component libraries, design system integration, and code quality conventions across web and mobile. Integrate frontend applications with REST APIs and event-driven backends, handling authentication flows, error boundaries, loading states, and real-time data patterns. Implement robust frontend testing strategies: unit tests (Jest, Vitest), component tests (React Testing Library), end-to-end tests (Playwright or Cypress), and iOS XCTest suites. Lead frontend performance engineering: bundle optimization, lazy loading, rendering strategies (SSR, CSR, ISR), Core Web Vitals, and iOS app performance profiling. Own the mobile development lifecycle on iOS: from Xcode project configuration and provisioning profiles to TestFlight distribution and App Store submission. Collaborate with UX Designers to translate designs into pixel-perfect, responsive, and accessible interfaces on both web and iOS. Champion AI-augmented development workflows using Claude Code: apply it actively for prototyping, code review, refactoring, and documentation generation. Conduct thorough code reviews, contribute to architectural decision records (ADRs), and mentor junior and mid-level frontend engineers. Work with DevOps to integrate frontend build and deployment into CI/CD pipelines: web app deployments, iOS build automation (Fastlane), and release management. Required Experience & Skills 6+ years of professional frontend development experience, with a strong track record of shipping production applications at scale. Expert-level JavaScript and TypeScript: deep understanding of the language, async patterns, module systems, and type-safe application design. Expert-level React: hooks, context, state management (Redux Toolkit, Zustand, or equivalent), performance patterns, and large-scale component architecture. Strong native iOS development skills using Swift and SwiftUI; experience with UIKit is a plus. Solid experience with iOS-specific concerns: push notifications, background processing, Keychain, deep linking, and App Store review guidelines. Experience consuming and designing frontend integrations with REST APIs, including authentication (OAuth2, JWT), error handling, and data caching strategies. Strong CSS and layout skills: responsive design, CSS-in-JS (Styled Components, Emotion), or utility-first frameworks (Tailwind CSS). Experience with frontend build tooling: Vite, Webpack, or equivalent; understanding of bundling, tree-shaking, and deployment optimization. Hands-on proficiency with Claude Code: using it daily for development, debugging, refactoring, and documentation tasks. Proven ability to define architecture, set standards, and lead technical decisions in a senior individual contributor or tech lead capacity. Strong communication skills: able to collaborate effectively with designers, product managers, and backend engineers across global, distributed teams. What we offer Contract under Polish law: B2B or Umowa o Pracę Benefits such as private medical care, group insurance, Multisport card English classes available Hybrid work (at least 1 day/week on-site) in Warsaw (Mokotów) Opportunity to work with excellent professionals High standards of work and focus on the quality of code New technologies in use Continuously learning and growth International team Pinball, PlayStation & much more (on-site) Join a growing team of dedicated professionals! We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply ➡️

🏢 Summary: Frontend Vue.js Engineer role for a long-term insurance project focused on integrating multiple applications into a unified ecosystem for claims handling and valuation management. The position involves developing modern web applications, integrating frontend interfaces with REST APIs, and maintaining end-to-end testing in a highly connected environment. The offer includes hybrid work in Warsaw, flexible contract options, and access to modern technologies and international collaboration. 🗂️ Requirements: Commercial experience with JavaScript, Experience with Vue.js, Experience working with REST APIs, Experience creating and maintaining end-to-end tests with Cypress, Ability to work in a complex interconnected environment 📃 Skills: JavaScript, Vue.js, REST, Cypress, AWS, Docker, Kubernetes, OWASP, OCR 🏢 Description: About Webellian Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy. About the position We are looking for a Frontend (Vue.js) Engineer to join a long-term project in the insurance domain. The project brings together three interconnected applications into a unified ecosystem supporting claims handling, valuation management, and comparison of repair estimates with counter-offers. The role focuses on developing and maintaining modern web applications in a highly integrated environment, where multiple systems communicate through APIs. You will work on creating intuitive user interfaces, ensuring seamless integration with backend services, and contributing to the quality and reliability of the application through automated testing. Key responsibilities: Develop and maintain frontend applications using JavaScript and Vue.js. Build user interfaces that integrate with backend services via REST APIs. Create and maintain end-to-end tests using Cypress. Collaborate with cross-functional teams to deliver high-quality solutions. Contribute to application quality by following development best practices and supporting continuous improvements. Required Experience & Skills Must have Commercial experience with JavaScript development. Experience with Vue.js. Experience working with REST APIs in a complex, interconnected environment. Experience creating and maintaining end-to-end tests using Cypress. Nice to have Experience with AWS. Experience with Docker and Kubernetes. Basic understanding of application security principles, including OWASP Top 10 and secure coding best practices. Experience with AI-based OCR and document processing. What we offer Contract under Polish law: B2B or Umowa o Pracę Benefits such as private medical care, group insurance, Multisport card There are English classes available Hybrid work (at least 1 day/week on-site) in Warsaw (Mokotów) Opportunity to work with excellent professionals High standards of work and focus on the quality of code New technologies in use Continuously learning and growth International team Pinball, PlayStation & much more (on-site) Join a growing team of dedicated professionals! We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply ➡️ Apply now

🏢 Summary: Senior Java Backend Engineer role focused on building and operating production-grade, AI-enabled backend services within a global Advanced Analytics team. The position involves designing cloud-native microservices, standardizing APIs, and ensuring security, observability, and reliability in regulated environments. You will work cross-functionally and take end-to-end ownership from design to operations. 🗂️ Requirements: Proficiency in Java 17+, Experience with REST and SOAP APIs, Strong knowledge of JSON, YAML, XML, Experience with Docker and Kubernetes, Hands-on experience with AWS, Proficiency with SQL databases (DB2, PostgreSQL), Experience with Git and GitHub, Familiarity with CI/CD tools (Jenkins or GitHubActions or Nexus), Knowledge of Keycloak for authentication and authorization, Experience with Dynatrace or monitoring tools, Understanding of microservices architecture, Basic knowledge of AI technologies 📃 Skills: Java, REST, SOAP, JSON, YAML, XML, Git, GitHub, Docker, SQL, DB2, PostgreSQL, Maven, Kubernetes, AWS, Jenkins, GitHubActions, Nexus, Keycloak, Dynatrace, A3K, Airwave, CISL, Jira, Confluence, Copilot, Claude, AI 🏢 Description: About Webellian Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy. About the position As a Senior Java Backend Engineer within Advanced Analytics in the Chief Data & AI Office, you will join the central AI team to build and maintain robust, production-grade AI-enabled services on a global scale. You will work in a cross-functional environment with ML Engineers, Platform Engineers, AI Architects, and DevOps, taking end-to-end ownership from design through reliable operations. In this role, you will help establish consistent engineering standards for security, observability, and delivery, and contribute to scalable internal platforms and shared services that accelerate teams worldwide. Key responsibilities Design, build, and maintain Java microservices forming the API layer: clean REST interfaces, robust domain models, and maintainable data access patterns using JPA/Hibernate or equivalent. Wrap and expose existing enterprise systems through well-defined service boundaries, enabling incremental modernization without wholesale replacement. Deliver cloud-native services using Docker and Kubernetes (AKS), with attention to scalability, resilience, and cost-efficiency. Build and maintain CI/CD pipelines with automated tests, quality gates, and secure delivery practices using GitHub Actions. Integrate and standardize API exposure via Azure API Management (APIM): usage policies, throttling, authentication/authorization, and versioning. Establish and maintain observability standards using Azure Monitor and Application Insights: dashboards, alerting, distributed tracing, and runbooks. Diagnose and resolve complex issues across microservices, clusters, and pipelines; perform root-cause analysis and preventative improvements. Embed security and resilience: secrets management via Azure Key Vault, least privilege, container security best practices, and disaster recovery patterns. Engineer for regulated environments: audit-friendly practices, traceable changes, reliable logging, and disciplined handling of sensitive data (minimization, access controls, retention). Collaborate with Python/AI engineers to define clear integration contracts between the Java API layer and the Python AI layer. Required Experience & Skills 5+ years professional backend engineering experience with Java in production environments. Expert-level Java; ideally Spring Boot (primary candidate) with real-world experience; familiarity with Quarkus or Micronaut is a plus. Strong engineering fundamentals: testing strategies (unit, integration, contract), REST API versioning, documentation, code quality, and pragmatic system design. Production experience with Docker and Kubernetes. Strong CI/CD experience (GitHub Actions preferred; ArgoCD or similar also relevant). Familiarity with Azure cloud platforms and services, particularly AKS, ACR, Key Vault, Azure Monitor/Application Insights, and Azure API Management (APIM). Strong experience with PostgreSQL including schema design, migrations (Flyway/Liquibase), and performance tuning fundamentals. Experience integrating with or wrapping legacy enterprise systems via REST, SOAP, or messaging. Familiarity with distributed systems and event-driven architectures using Kafka. Strong troubleshooting skills and an operational mindset. Ways of Working Comfortable in agile, iterative delivery environments with ownership and accountability. Clear communicator and collaborator across global, cross-functional stakeholders. Proactive learner with pragmatic adoption of AI-assisted developer tools (e.g., GitHub Copilot, Claude Code) to improve developer experience and delivery velocity. What we offer Contract under Polish law: B2B or Umowa o Pracę Benefits such as private medical care, group insurance, Multisport card English classes available Hybrid work (at least 1 day/week on-site) in Warsaw (Mokotów) Opportunity to work with excellent professionals High standards of work and focus on the quality of code New technologies in use Continuously learning and growth International team Pinball, PlayStation & much more (on-site) Join a growing team of dedicated professionals! We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply ➡️

🏢 Summary: Senior Fullstack Engineer role focused on building and enhancing client solutions using Node.js and React technologies, including a back-office platform for a global insurance leader. The position involves fullstack development, technical analysis, clean code delivery, mentoring junior developers, and collaboration with international teams in a hybrid Warsaw-based environment. 🗂️ Requirements: 5+ years of Fullstack development experience, Master’s degree in Software Engineering or related field, Strong knowledge of Node.js and React, Experience with related frontend and backend frameworks, Experience writing unit tests and technical documentation, Understanding of software architecture and development principles, Familiarity with REST API and GraphQL, Knowledge of SQL and NoSQL databases, Fluent English level B2 minimum, Excellent verbal communication skills 📃 Skills: Node.js, React, ReactNative, Next.js, Redux, TypeScript, Bootstrap, MaterialUI, Nest.js, Fastify, Express, AWS, Bitbucket, Git, Jenkins, PostgreSQL, Docker, REST, GraphQL, SQL, NoSQL, Strapi 🏢 Description: About the opportunity We are seeking an experienced Senior Fullstack Engineer (Node.js & React) to join our team and work on exciting projects for key customers. In this role, you will have the opportunity to interface with clients and drive the development of their solutions. You will join the team working on a back-office solution for a global insurance industry leader using Strapi and React. As a software engineer, you will be responsible for delivering high-quality projects by defining technical requirements based on business needs and deploying clean code. The role values reusing open-source frameworks and solutions. To be successful in this position, you must have at least 5 years of experience in Fullstack development, a deep understanding of Node.js, React and related frameworks, and experience working collaboratively in a team environment. Key responsibilities - Analyzing business requirements - Writing clean, functional code, including unit tests - Writing technical documentation - Proposing technical improvements to the application - Growing and nurturing junior colleagues' skills - Supporting less experienced team members Competencies - Master’s degree in Software Engineering or related engineering field - Frontend Technologies: React, React Native, Next.js, Redux, Typescript, Bootstrap, Material UI - Backend Technologies: Node.js, Nest.js, Fastify, Express - Other Technologies: AWS, Bitbucket/GIT, Jenkins, PostgreSQL, Docker - Familiarity with REST API and GraphQL - Familiarity with SQL and NoSQL databases - Deep understanding of software architecture and development principles - Fluency in English is a must (min B2, C1 preferred) - Excellent verbal communication skills are a must - Can-do attitude - Great attention to detail - Independence and drive to grow and learn What we offer - Contract under Polish law: B2B or Umowa o Pracę - Benefits such as private medical care, group insurance, Multisport card - English classes available - Hybrid work (at least 3 days/week on-site) in Warsaw (Mokotów) - Opportunity to work with excellent professionals - High standards of work and focus on the quality of code - New technologies in use - Continuously learning and growth - International team - Pinball, PlayStation & much more (on-site) Join a growing team of dedicated professionals focused on knowledge sharing, collaboration, and professional growth.

🏢 Summary: Senior Full Stack Engineer role focused on building and delivering scalable applications using Node.js and React in Agile environments. The position involves end-to-end SDLC ownership, architectural decision-making, collaboration with engineering teams and stakeholders, and support for mission-critical systems at scale. The offer includes hybrid work in Warsaw, international collaboration, and opportunities to work with modern cloud and development technologies. 🗂️ Requirements: 6+ years of commercial Full Stack development experience, Strong knowledge of JavaScript and TypeScript, Experience with Node.js and React, Experience working in Agile engineering environments, Master’s degree in Software Engineering, Computer Science, or related field, Experience with AWS, Docker, PostgreSQL, Git/Bitbucket, and Jenkins, Knowledge of REST APIs and GraphQL, Knowledge of SQL and NoSQL databases, Understanding of SDLC practices and Agile methodologies, Understanding of software architecture, scalability, design patterns, and SOLID principles, Experience leading technical projects and participating in architectural decisions, Fluent English communication skills (minimum B2), Experience working in customer-facing or international environments 📃 Skills: JavaScript, TypeScript, Node.js, React, ReactNative, Expo, Azure, AWS, Docker, PostgreSQL, Git, Bitbucket, Jenkins, REST, GraphQL, SQL, NoSQL, CI/CD 🏢 Description: About the job We are actively looking for a Senior Full Stack Engineer (Node.js & React). In this role, you will own technical responsibilities from conception to delivery. As a Senior Full Stack Engineer, you will collaborate closely with engineering teams, interact directly with customers and stakeholders, work on mission-critical systems at scale, and support the SDLC process end-to-end. This role requires a strong ownership mindset and readiness to take technical responsibility for project delivery, including participation in architectural discussions and technical decision-making. To be successful in this position, you should have at least 6 years of commercial experience in Full Stack development, strong understanding of Node.js, React, and related frameworks, and experience working within Agile engineering environments. Key responsibilities - Analyze business and technical functional and non-functional requirements - Design and develop clean, maintainable, and scalable code, including unit tests - Prepare and maintain technical documentation - Propose and implement technical improvements to applications and development processes - Participate in troubleshooting and resolving complex technical issues - Collaborate with other engineering teams to design and implement technical solutions - Contribute to architectural and technical decision-making processes - Support SDLC activities end-to-end, including development, testing, deployment, and production support - Take ownership of technical delivery Competencies - Master’s degree in Software Engineering, Computer Science, or related technical field - Must-have Technologies: JavaScript, TypeScript, Node.js, React - Advantage: React Native, Expo, Microsoft Azure - Fluency in English is required (minimum B2, C1 preferred) - Excellent verbal and written communication skills - Experience working with AWS, Docker, PostgreSQL, Git/Bitbucket, and Jenkins - Familiarity with REST APIs and GraphQL - Familiarity with SQL and NoSQL databases - Strong understanding of Agile methodologies and SDLC practices - Understanding of software architecture trade-offs, scalability considerations, design patterns, and SOLID principles - Leadership mindset: previous experience in technically leading projects, participating in architectural decision-making, and taking responsibility for the technical delivery process - Experience working in customer-facing or international environments Nice to have - Experience with CI/CD pipelines and deployment automation for web and mobile applications (e.g., EAS Build for Expo) - Experience in scaling applications and handling high-traffic workloads - Experience with cloud-native architectures and distributed systems - Familiarity with monitoring, observability, and production troubleshooting practices - Experience in fintech or insuretech environments What we offer - Contract under Polish law: B2B or Umowa o Pracę - Benefits such as private medical care, group insurance, Multisport card - English classes available - Hybrid work (at least 3 days/week on-site) in Warsaw (Mokotów) - Opportunity to work with excellent professionals - High standards of work and focus on the quality of code - New technologies in use - Continuously learning and growth - International team - Pinball, PlayStation & much more (on-site)

🏢 Summary: Senior Full Stack Engineer role focused on building and delivering scalable, mission-critical applications using Node.js and React. The position involves end-to-end ownership from design and architecture to deployment and production support within Agile environments. The role requires strong technical leadership, architectural involvement, and collaboration with cross-functional and customer-facing teams. 🗂️ Requirements: Minimum 6 years of commercial Full Stack development experience, Strong knowledge of Node.js and React, Proficiency in JavaScript and TypeScript, Experience working in Agile environments, Experience with AWS and Docker, Experience with PostgreSQL, Experience with Git or Bitbucket and Jenkins, Familiarity with REST APIs and GraphQL, Knowledge of SQL and NoSQL databases, Understanding of software architecture, design patterns, and SOLID principles, Experience with SDLC processes end-to-end, Fluency in English (minimum B2), Master’s degree in Computer Science, Software Engineering, or related field 📃 Skills: JavaScript, TypeScript, Node.js, React, AWS, Docker, PostgreSQL, Git, Bitbucket, Jenkins, REST, GraphQL, SQL, NoSQL, Azure, ReactNative, Expo 🏢 Description: About Webellian Webellian is a well-established Digital transformation and IT consulting company committed to creating a positive impact for our clients. We are driven by shared values, strong principles, and a passion for innovative and disruptive technologies. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy. About the job We are actively looking for a Senior Full Stack Engineer (Node.js & React). In this role, you will own technical responsibilities from conception to delivery. As a Senior Full Stack Engineer, you will collaborate closely with engineering teams, interact directly with customers and stakeholders, work on mission-critical systems at scale, and support the SDLC process end-to-end. This role requires a strong ownership mindset and readiness to take technical responsibility for project delivery, including participation in architectural discussions and technical decision-making. To be successful in this position, you should have at least 6 years of commercial experience in Full Stack development, strong understanding of Node.js, React, and related frameworks, and experience working within Agile engineering environments. Key responsibilities Analyze business and technical functional and non-functional requirements Design and develop clean, maintainable, and scalable code, including unit tests Prepare and maintain technical documentation Propose and implement technical improvements to applications and development processes Participate in troubleshooting and resolving complex technical issues Collaborate with other engineering teams to design and implement technical solutions Contribute to architectural and technical decision-making processes Support SDLC activities end-to-end, including development, testing, deployment, and production support Take ownership of technical delivery Competencies Master’s degree in Software Engineering, Computer Science, or related technical field Must-have Technologies: JavaScript, TypeScript, Node.js, React Advantage: React Native, Expo, Microsoft Azure Fluency in English is required (minimum B2, C1 preferred) Excellent verbal and written communication skills Experience working with AWS, Docker, PostgreSQL, Git/Bitbucket, and Jenkins Familiarity with REST APIs and GraphQL Familiarity with SQL and NoSQL databases Strong understanding of Agile methodologies and SDLC practices Understanding of software architecture trade-offs, scalability considerations, design patterns, and SOLID principles Leadership mindset: previous experience in technically leading projects, participating in architectural decision-making, and taking responsibility for the technical delivery process Experience working in customer-facing or international environments Nice to have Experience with CI/CD pipelines and deployment automation for web and mobile applications (e.g., EAS Build for Expo) Experience in scaling applications and handling high-traffic workloads Experience with cloud-native architectures and distributed systems Familiarity with monitoring, observability, and production troubleshooting practices Experience in fintech or insuretech environments What we offer Contract under Polish law: B2B or Umowa o Pracę Benefits such as private medical care, group insurance, Multisport card There are English classes available Hybrid work (at least 3 days/week on-site) in Warsaw (Mokotów) Opportunity to work with excellent professionals High standards of work and focus on the quality of code New technologies in use Continuously learning and growth International team Pinball, PlayStation & much more (on-site 🤫) Interested? Please click the “Apply for this job” button and send us your CV in English. Please include the following statement: I hereby authorize Webellian Poland Sp. z o.o. to the process personal data provided in this document for realising the recruitment process pursuant to the Personal Data Protection Act of 10 May 2018 (Journal of Laws 2018, item 1000) and in agreement with Regulation (EU) 2016/679 of the European Parliament and of the Council of 27 April 2016 on the protection of natural persons with regard to the processing of personal data and on the free movement of such data, and repealing Directive 95/46/EC (General Data Protection Regulation).

🏢 Summary: Fullstack Engineer role focused on developing back-office and client solutions using Node.js and React technologies in a collaborative international environment. The position involves analyzing business requirements, building scalable applications, writing clean code and technical documentation, and supporting junior team members. Hybrid work in Warsaw with opportunities to work on modern technologies and enterprise projects. 🗂️ Requirements: 3+ years of Fullstack development experience, Master’s degree in Software Engineering or related field, Strong knowledge of Node.js and React, Experience with related frontend and backend frameworks, Familiarity with REST API and GraphQL, Knowledge of SQL and NoSQL databases, Understanding of software architecture and development principles, Fluent English level B2 minimum, Excellent verbal communication skills 📃 Skills: Node.js, React, ReactNative, Next.js, Redux, TypeScript, Bootstrap, MaterialUI, Nest.js, Fastify, Express, AWS, Bitbucket, Git, Jenkins, PostgreSQL, Docker, REST, GraphQL, SQL, NoSQL, Strapi 🏢 Description: About the opportunity We are seeking an experienced Fullstack Engineer (Node.js & React) to join our team and work on exciting projects for our key customers. In this role, you will have the opportunity to interface with clients and drive the development of their solutions. For instance, you will join the team working on a back-office solution for a global insurance industry leader using Strapi and React. As a software engineer, you will be responsible for delivering high-quality projects by defining technical requirements based on business needs and deploying clean code. You won't need to reinvent the wheel as we value the power of reusing open-source frameworks and solutions. To be successful in this position, you must have at least 3 years of experience in Fullstack development, a deep understanding of Node.js, React and related frameworks, and experience working collaboratively in a team environment. Key responsibilities - Analyzing business requirements - Writing clean, functional code, including unit tests - Writing technical documentation - Proposing technical improvements to the application - Growing and nurturing junior colleagues' skills - Supporting less experienced team members Competencies - Master’s degree in Software Engineering or related engineering field - Frontend Technologies: React, React Native, Next.js, Redux, Typescript, Bootstrap, Material UI - Backend Technologies: Node.js, Nest.js, Fastify, Express - Other Technologies: AWS, Bitbucket/GIT, Jenkins, PostgreSQL, Docker - Familiarity with REST API and GraphQL - Familiarity with SQL and NoSQL databases - Deep understanding of software architecture and development principles - Fluency in English is a must (min B2, C1 preferred) - Excellent verbal communication skills are a must - Can-do attitude - Great attention to detail - Independence and drive to grow and learn What we offer - Contract under Polish law: B2B or Umowa o Pracę - Benefits such as private medical care, group insurance, Multisport card - English classes available - Hybrid work (at least 3 days/week on-site) in Warsaw (Mokotów) - Opportunity to work with excellent professionals - High standards of work and focus on code quality - New technologies in use - Continuous learning and growth - International team - Pinball, PlayStation & more on-site Join a growing team of dedicated professionals focused on knowledge sharing, collaboration, and professional growth.

🏢 Summary: Full Stack Engineer role focused on building scalable distributed applications using Java and modern frontend technologies in an agile environment. The position involves backend and frontend development, microservices, testing, and collaboration with cross-functional teams in a hybrid work model in Warsaw. 🗂️ Requirements: Proven experience as a Full Stack Engineer, Strong experience with Java, Strong experience with Spring, Strong experience with Kafka, Strong understanding of TypeScript, Strong understanding of Angular, Experience with databases, Experience with distributed systems, Solid understanding of microservice architecture, Experience writing unit tests, Experience writing integration tests, Ability to work in agile delivery environments, Strong communication skills 📃 Skills: Java, Spring, Kafka, TypeScript, Angular, SQL, Microservices, Docker, Kubernetes, OpenAPI, Swagger, Atlas, DevOps, AI, MachineLearning 🏢 Description: About Webellian Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy. About the position We are seeking a motivated and experienced Full Stack Engineer with a strong background in Java and distributed systems to join our dynamic team. The ideal candidates will have extensive expertise in developing scalable and maintainable applications in agile-based delivery environments, with a proactive approach to problem-solving. Key responsibilities: Design, develop, and maintain applications in a complex and interconnected environment. Participate in code reviews and contribute to a culture of continuous improvement. Analyze existing business logic and data structures across several systems. Collaborate with cross-functional teams to refine, design, and develop new features. Troubleshoot and resolve complex technical issues. Required Experience & Skills Proven experience as a Full Stack Engineer Ability to learn quickly and adapt to new technologies and methodologies. Strong communication skills. Strong experience with backend technologies (Java, Spring, Kafka). Strong understanding of front-end technologies (TypeScript, Angular). Experience with databases and distributed systems. Solid understanding of microservice architecture. Strong testing background and experience writing unit- and integration tests. Preferred Qualifications Familiarity with containerization and orchestration tools (e.g., Docker, Kubernetes). DevOps experience. Knowledge of Atlas or similar database migration tools. Familiarity with OpenAPI/Swagger specifications and code generation. Knowledge of AI and machine learning concepts. What we offer Contract under Polish law: B2B or Umowa o Pracę Benefits such as private medical care, group insurance, Multisport card There are English classes available Hybrid work (at least 1 day/week on-site) in Warsaw (Mokotów) Opportunity to work with excellent professionals High standards of work and focus on the quality of code New technologies in use Continuously learning and growth International team Pinball, PlayStation & much more (on-site) Join a growing team of dedicated professionals! We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply ➡️

🏢 Summary: Full Stack Technical Lead role focused on leading an engineering team delivering cloud-native digital insurance products. The position combines hands-on backend and frontend development with ownership of application architecture, API design, and technical standards. You will drive technical direction, ensure delivery quality, and collaborate closely with product, platform engineering, and business stakeholders. 🗂️ Requirements: 7+ years professional software engineering experience, Minimum 2 years in a technical leadership role, Strong backend development experience in Java and Spring Boot or equivalent, Frontend development experience in React or equivalent, Experience designing microservices architectures and REST APIs at production scale, Understanding of distributed system patterns, Experience designing services for Kubernetes environments, Familiarity with CI/CD and GitOps deployment models, Experience leading Agile sprint delivery and technical scoping, Experience in regulated industries such as insurance, finance, or healthcare 📃 Skills: Java, Spring, SpringBoot, React, Microservices, REST, Kubernetes, CI/CD, GitOps, Kafka, Azure, API, Docker 🏢 Description: About Webellian Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for our clients. We strive to make a meaningful difference in diverse sectors such as insurance, banking, healthcare, retail, and manufacturing. Our passion for cutting-edge and disruptive technologies, as well as our shared values and strong principles, are what motivate us. We are a community of engineers and senior advisors who work with our clients across industries, playing a deep and meaningful role in accelerating and realizing their vision and strategy. About the position As a Full Stack Technical Lead you will lead an engineering team building digital insurance products and services. You are the technical authority for your team: you own the application architecture, set the engineering standards, and are responsible for the quality of everything the team ships. You will work within a cloud-native engineering environment where CI/CD pipelines, containerisation standards, and deployment tooling are provided centrally. Your role is to lead the application layer (service design, API architecture, and team delivery), not to own infrastructure. You are the primary technical interface between your product team and the central platform engineering function, and between engineering and the wider product and business stakeholders. This is a hands-on technical leadership role. You will be expected to remain close to the code while carrying the responsibility for the team's technical direction and delivery quality. Key responsibilities: Architecture and Technical Direction Own the application architecture for your product: service decomposition, API design, data models, event schemas, and integration patterns with core insurance systems. Make architectural decisions that are durable, well-reasoned, and clearly communicated to the team and stakeholders. Identify and manage technical debt: prioritise pragmatically, document trade-offs, and schedule remediation in delivery planning. Define technical standards for the team (coding conventions, testing practices, API versioning, observability instrumentation) and hold the team to them. Work within the deployment and containerisation standards provided by the central engineering platform; raise and influence changes to those standards through the appropriate channels. Delivery Leadership Translate business and product requirements into technical designs; lead estimation and scope definition. Identify and communicate technical risk early; propose mitigations and make trade-offs transparent to the Product Owner. Collaborate with the Scrum Master on sprint planning to ensure technical work is appropriately sized, dependency-mapped, and sequenced. Represent engineering in architecture reviews, sprint reviews, and stakeholder discussions. Interface with the central platform engineering team on technical questions, onboarding requirements, and issue escalations. Team and Code Quality Own the code review process: set the bar, lead by example, and ensure reviews are substantive and timely. Mentor mid-level and senior engineers: support their technical growth through pairing, design discussion, and structured feedback. Build a team culture of ownership, quality, and continuous improvement; facilitate retrospective follow-through on engineering practices. Onboard new engineers to the codebase, standards, and ways of working. Collaboration Collaborate with frontend Tech Leads and other domain teams on cross-cutting API contracts and shared integration points. Work with the Product Owner on roadmap planning: provide clear technical input on feasibility, effort, and sequencing. Communicate clearly across technical and non-technical stakeholders; translate engineering complexity into business-relevant language. Required Experience & Skills 7+ years of professional software engineering experience, with at least 2 years in a technical leadership role (Tech Lead, Principal Engineer, or equivalent). Deep backend development experience: Java (Spring Boot) or equivalent, able to review, design and contribute to production code. Frontend experience: React or equivalent, able to review and contribute to production code. Capable of participating meaningfully in cross-functional technical discussions spanning frontend, BFF, and backend layers. Microservices architecture: service boundary design, API design and versioning, distributed system patterns (eventual consistency, idempotency, retry strategies). REST API design at production scale: resource modelling, contract versioning, backward compatibility, error handling conventions. Kubernetes-aware service design: designing services to run well in Kubernetes (readiness/liveness probes, graceful shutdown, resource requests, horizontal scaling). You do not need to operate the cluster. CI/CD and GitOps familiarity: understanding of pipeline-based and pull-based deployment models; able to work within and influence deployment standards. Agile delivery leadership: experience leading a team through sprint delivery, dependency management, and technical scoping in a product-led environment. Regulated industry experience: insurance, finance, or healthcare. Understands the implications of audit logging, data residency, access control, and compliance requirements on engineering decisions. Strong communicator: able to lead technical discussions, document architectural decisions clearly, and represent engineering credibly to non-technical audiences. Ways of Working Leads by example: stays close to the code and models the quality and rigour expected from the team. Collaborative and direct: shares context freely, gives clear feedback, and creates an environment where engineers can raise concerns and propose improvements. Pragmatic: balances technical correctness with delivery reality; makes trade-offs explicitly rather than silently. Comfortable with ambiguity: can scope and lead work in areas where requirements are still forming, and knows how to structure discovery to reduce uncertainty. Proactive learner: keeps up with backend and cloud-native ecosystem developments; comfortable adopting AI-assisted developer tools (e.g. GitHub Copilot, Claude Code) to improve team productivity. Nice to Have Insurance or financial services domain knowledge: understanding of claims, policy, or payment workflows. Experience integrating AI or ML services into production business logic: consuming model outputs, handling confidence thresholds, building human-in-the-loop workflows. Event-driven architecture experience: Kafka or equivalent at production scale. Cloud certifications: AZ-204 (Azure Developer), AZ-305 (Azure Solutions Architect), or equivalent. Experience leading distributed or multi-vendor engineering teams. What we offer Contract under Polish law: B2B or Umowa o Pracę Benefits such as private medical care, group insurance, Multisport card Hybrid work (at least 1 day per 2 or 3 months on-site) in Warsaw (Mokotów) Opportunity to work with excellent professionals High standards of work and focus on the quality of code New technologies in use Continuously learning and growth International team Pinball, PlayStation & much more (on-site) Join a growing team of dedicated professionals! We love to pass on the knowledge to grow excellence, speak our minds without playing politics, and just enjoy hanging around together. If you share our passions - we want to meet you! So go ahead and apply ➡️

🏢 Summary: Senior AI/Full Stack Engineer role focused on building AI-powered applications using LLMs, RAG systems, and modern full-stack technologies. The position involves developing and deploying intelligent systems, integrating AI with external services, and making architectural decisions in a collaborative environment. The offer includes work with cutting-edge AI tooling, local GPU infrastructure, and high ownership over technical decisions. 🗂️ Requirements: 5+ years of full-stack development experience, TypeScript, Node.js, Nest.js, React, Experience with LLM deployment and serving, Experience building RAG systems, Understanding of prompt engineering, Understanding of agent/tool-use patterns, Experience with relational databases, Redis, Docker, Basic CI/CD knowledge, Ability to evaluate model performance, English B2+, Strong problem-solving skills 📃 Skills: AI, ML, LLMs, RAG, TypeScript, Node.js, Nest.js, React, PostgreSQL, Redis, Docker, CI/CD, Embeddings, LangChain, AWS, LoRA, QLoRA, MLOps, GPU 🏢 Description: About Webellian Webellian is a well-established Digital Transformation and IT consulting company committed to creating a positive impact for clients across insurance, banking, healthcare, retail, and manufacturing sectors. The company focuses on cutting-edge and disruptive technologies and brings together engineers and senior advisors to help clients accelerate and realize their vision and strategy. About the role We are seeking a Senior AI/Full Stack Engineer to join the team and drive the development of AI-powered solutions for clients. You will work on projects that combine modern web development with applied AI — from building intelligent agents and search systems to deploying and optimizing language models on dedicated infrastructure. This role bridges two worlds: solid full-stack engineering and practical AI/ML implementation. You’ll design, build, and ship products that leverage LLMs, RAG, and other AI techniques to solve real business problems. Your responsibilities - Designing and developing full-stack applications with AI capabilities - Deploying, configuring, and optimizing LLMs (both cloud APIs and self-hosted) - Building and maintaining RAG pipelines, vector search, and knowledge retrieval systems - Integrating AI systems with external services and APIs - Evaluating and selecting appropriate models and tools for specific use cases - Writing clean, maintainable code with tests and documentation - Proposing technical improvements and architectural decisions - Supporting and mentoring less experienced team members Must-have requirements AI/ML: - Hands-on experience with LLM deployment and serving (cloud APIs and/or self-hosted solutions) - Experience building RAG systems (embeddings, vector stores, retrieval strategies) - Understanding of prompt engineering and agent/tool-use patterns - Ability to evaluate model performance and make informed trade-off decisions Full Stack: - 5+ years in full-stack development with TypeScript/Node.js, Nest.js - Frontend experience with React - Relational databases (PostgreSQL or similar), Redis - Docker, basic CI/CD Soft skills: - Self-driven, able to take ownership of projects end-to-end - Strong problem-solving skills - English B2+ (C1 preferred) - Excellent communication — able to translate technical concepts for non-technical stakeholders Nice-to-have - Experience with model fine-tuning (LoRA, QLoRA) - MLOps practices (experiment tracking, model versioning) - Familiarity with agent frameworks (LangChain, Vercel AI SDK, or similar) - Experience with GPU infrastructure and model optimization (quantization, inference tuning) - AWS or other cloud provider (working knowledge) What we offer - Projects at the intersection of AI and software engineering - Opportunity to work with cutting-edge AI tooling and local GPU infrastructure - Autonomy and ownership over technical decisions - Hybrid work mode - Small, collaborative team - Challenging problems — no boring CRUD work