WHAT YOU CAN EXPECT 

• Take ownership of frontend development within a micro-frontend architecture inside the project. 

• Design, implement, and maintain scalable, modular, and accessible UI components. 

• Collaborate closely with backend engineers using API-first and BFF patterns. 

• Contribute to the transition phase, including knowledge transfer from the external supplier and stabilization of existing systems. 

• Drive modernization initiatives, especially around outdated frontend technologies (the current ExtJS-based application) and performance bottlenecks. 

• Ensure high code quality through TDD, code reviews, and automated testing. 

• Optimize applications for performance, accessibility (a11y), SEO, and sustainability. 

• Actively contribute to architectural decisions with a frontend perspective. 

• Support CI/CD pipelines and containerized frontend deployments (Docker). 

• Work in cross-functional, self-organized agile product teams and collaborate with stakeholders. 

Key Deliverables 

• High-quality, production-ready frontend features aligned with business requirements. 

• Maintainable and well-documented frontend codebases. 

• Improved application performance, stability, and user experience. 

• Successful transition of ownership from the previous supplier. 

• Contributions to a modern, agile, and outcome-driven product organization. 

• A strategically important project with high visibility, being the first insourcing initiative of its kind at diconium. 

• Full end-to-end ownership of frontend topics, from architecture and implementation to operations and optimization. 

• A complex, real-world product landscape with long-running systems, many interfaces, and meaningful technical challenges. 

• Active involvement in a transition phase, followed by shaping a modern, agile, outcome-driven product organization. 

• The opportunity to modernize and future-proof frontend technology, architecture, and development practices. 

• Close collaboration in cross-functional, self-organized product teams with a strong engineering culture. 

• Room to influence technical decisions, standards, and best practices across products. 

• A strong focus on quality, accessibility, performance, and sustainability. 

• Continuous learning through hands-on problem solving, knowledge sharing, and exposure to modern frontend and cloud technologies. 

• An international setup with English as working language, nearshore collaboration, and limited travel (~10days / year). 

WHAT YOU BRING ALONG  

ExtJS Expertise 

• Deep, hands-on proficiency in ExtJS 

• Experience with ExtJS customization and framework overrides 

• Solid understanding of ExtJS architecture (MVC / MVVM patterns) 

• Skilled in handling large volumes of data: data structures, models, stores, grids, and virtualization 

• Familiarity with ExtJS tooling, build processes, and licensing 

• Strong performance and enterprise-application mindset 

Core Architecture & Engineering 

• Understanding of Domain-Driven Design (DDD) concepts and bounded contexts 

• Experience with microservices and micro-frontend architectures 

• API-first mindset; experience with API Gateway and Backend-for-Frontend (BFF) patterns 

• Knowledge of common software design patterns 

• Familiarity with resiliency patterns (retry, fallback, rate limiting) 

• Ability to design for scalability, fault tolerance, and observability 

Frontend Development 

• Strong proficiency in JavaScript and/or TypeScript 

• Experience with at least one modern frontend framework (React, Angular, Vue.js, Svelte) — a plus, given the roadmap to modernize away from ExtJS 

• Development of modular, scalable, responsive UI components 

• Experience with modern frontend build tools and workflows 

• Focus on accessibility (a11y), performance optimization, and SEO 

• Knowledge of lazy loading, code splitting, and frontend performance techniques 

• Strong understanding of UI/UX principles 

Quality & Security 

• Advanced knowledge of Git and version control workflows 

• Experience with Test-Driven Development (TDD) and automated UI testing 

• Awareness of secure coding practices and common web security risks 

DevOps & Delivery 

• Experience building and maintaining CI/CD pipelines (GitHub, GitLab, Jenkins or similar) 

• Working knowledge of Docker for frontend deployment and environment decoupling 

Collaboration & Professional Skills 

• Strong communication and stakeholder interaction skills 

• Team-oriented mindset and collaborative approach 

• Ability to learn quickly and adapt to change 

• Strong problem-solving and time-management skills 

• Ownership-driven, customer-centric, and sustainability-aware mindset