Senior Frontend Developer at SIA Joom in Berlin, DE

We are Onfy — a German pharmacy marketplace founded in 2021. We are on a mission to constantly find new and innovative ways to support your health online. We empower our customers to take their health into their own hands by providing an easy, convenient and affordable experience.

Our website www.onfy.de launched in November 2021, and since then it has developed into an online platform that offers consumers the unique ability to order and to receive health products from several pharmacies at once with low prices and fast delivery. We are an agile, rapidly growing team of forward thinkers, and we believe in people who want to change the world of health for the better using the latest technology available.

We continue to evolve our product experience, making it more advanced, reliable, and engaging for users. We are looking for a Senior Frontend Developer to join the Onfy team - someone with deep frontend expertise who can own complex technical areas, make strong architectural decisions, and actively contribute to product discussions.

The main focus of the role is frontend development. At the same time, we value T-shaped engineers: experience with mobile development, especially iOS or Android, would be a strong advantage. We expect the person in this role to be interested in working across platform boundaries and growing beyond frontend when it brings value to the product.We actively use AI in our engineering workflows and welcome candidates who thoughtfully apply AI tools to improve development speed, quality, and decision-making.

Tech stack

• Main: TypeScript, React, Next.js
• State & data: Redux, Effector, React Query
• Styling: CSS, Styled Components, Tailwind

Responsibilities

• Develop and evolve frontend architecture for user-facing product areas
• Build reliable, scalable, and maintainable web interfaces
• Design client-side integrations with backend services and APIs
• Improve product flows across key user journeys
• Participate in product discussions, feature design, and experiment launches
• Work closely with product managers, designers, QA engineers, analysts, backend developers, and mobile developers
• Maintain and improve code quality, performance, accessibility, and automated tests

Requirements

• Strong experience with frontend development using JavaScript and TypeScript
• Solid experience with React and modern frontend architecture
• Experience with Next.js, SSR, and SPA architecture
• Experience working with REST APIs and client–server applications
• Experience with state management and data-fetching tools such as Redux, Effector, or React Query
• Ability to design maintainable architecture and make pragmatic technical decisions
• Product-oriented engineering mindset: ability to understand user problems, think beyond implementation, and contribute to product decisions

Nice to have

• Experience with iOS or android development
• Interest in growing as a T-shaped engineer across web and mobile platforms
• Professional use of AI coding tools such as Cursor, Claude Code, or similar
• Ability to evaluate AI-assisted workflows: what worked, what did not, and why

We offer

• Fully remote or hybrid format (Berlin or Lisbon office)
• Permanent employment contract (Germany or Portugal) or Contract-based collaboration (full-time)
• Transparent growth framework: we define growth expectations together and set goals that align with them

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