Full-Stack Developer (FE Focus) (m/f/d)

As a Full-Stack Developer (FE Focus) at Joy_, you’ll own and shape the user experience across our customer- and partner-facing products—from B2C gift flows to B2B dashboards and embeddable tools. You’ll work directly with the founders in a fast-paced, senior team, shipping meaningful features in days, not quarters. If you love combining design sensibility with real impact, this is your chance to help build the infrastructure behind the future of commerce.

As our second dedicated engineer on the client side, you will:

• Own the entire front-end experience—from design critique to pixel-perfect implementation—and contribute to the Python back-end when needed.
• Craft elegant, responsive UIs for customers (B2C gift card flows) and partners (B2B self-serve dashboards, embeddable widgets).
• Shape component libraries, design tokens, and accessibility guidelines in a company with focused product-management and design resources.
• Pair with founders on product discovery, run quick experiments, and measure impact.
• Review code and mentor future team-mates.

What we're looking for

• 3+ years of professional experience building modern web products, with Vue knowledge (or React/Angular expertise with enthusiasm to learn Vue).
• Solid Python skills: comfortable adding endpoints, optimizing queries, and debugging async workers.
• Strong design sensibility—at ease discussing typography, layout grids, and motion; proficient with Figma.
• Pragmatic testing approach (unit + e2e) and dedication to performance and accessibility.
• Excellent spoken and written English.

Nice to have

• Experience with payments, e-commerce, or loyalty/rewards products.
• Familiarity with experiments/A-B testing frameworks and event analytics.
• Experience with design systems or Storybook, and infrastructure-as-code (Terraform, Pulumi).
• Working knowledge of SQL, RESTful API design, GitHub Actions (or similar), and containerized deployments on Kubernetes.

At Joy_ we’re turning every product on the internet into a potential moment of appreciation.

Our infrastructure stitches together live merchant feeds, AI-powered search and instant checkout rails so brands can offer any product online, in real time, through a single API.

That engine powers a new class of experiences:

• Commerce infrastructure for retailers – plug Joy_ into site-search or checkout to fill “out-of-stock” gaps, drop-ship on demand and grow assortment with zero inventory or new workflows.
• Gift cards that aren’t stuck in walled gardens – branded, media-rich and redeemable for millions of items instead of a single store.
• Loyalty & rewards that feel personal – users save for the exact product they want, not a generic catalogue.
• Employee benefits that people actually use – from monthly stipends to one-off “thank-yous”, all white-labelled and API-first.

Because everything is virtual we need no warehouses, no middlemen and zero extra stock; partners keep the margin while customers enjoy true flexibility.

Whether you’re an e-commerce giant filling assortment gaps, a fintech nudging action with meaningful rewards, or an HR platform boosting engagement, Joy_ is building the infrastructure for the future of commerce.

How we work & what you get

• Small, senior team & big ownership – ship end-to-end features in days, not quarters.
• Hybrid-friendly – our office is in Berlin, with team members across Europe (regular in-person meetings).
• Competitive salary + meaningful equity – we want you to win with us.
• Purposeful product – build tech that makes giving (and getting) gifts more personal, sustainable, and joyful.

Sounds like you?

Send a quick note, your GitHub or portfolio, and a short example of a UI you're proud of. No formal cover letter needed—just tell us why Joy_ and how you can make an impact.

We can't wait to build the future of commerce together! 🎁

At Joy_, we place great value on equal opportunities. We believe that an outstanding work environment should reflect a diversity of backgrounds, talents, and thoughts. Together, we grow as a team based on our individual strengths. Every personnel decision is made solely based on qualifications, performance, and the requirements of the company.