Berlin's tech scene has seen plenty of bold bets over the years. Few, however, are as ambitious as what Joy_ is building. The company wants to make every product on the internet instantly available to anyone, anywhere, through a single piece of infrastructure. For a Full-Stack Developer (m/f/d) looking for meaningful technical work, Joy_ represents a rare kind of opportunity inside a very small, very focused team.
What Joy_ Actually Does
Joy_ built what it calls a Universal Purchasing Infrastructure. This system runs the entire e-commerce value chain end to end, covering sourcing, checkout, payment, fulfillment, customer care, and returns. It works across any online shop on the planet, with no merchant contracts and no closed networks.
The first live business model sitting on top of this infrastructure is the gift card. Germany's gift card market alone is worth 20 billion euros. Joy_ created a gift card that lets recipients redeem it for any product from any shop. Nothing like it existed before in that market.
This is not a product in development. The technology is live and running today. That distinction matters enormously when you consider what kind of engineering challenges actually await you there.
The Company Culture at Joy_
Joy_ operates with a team of twelve people spread across Europe. The company's cultural identity is shaped by that size. There are no bureaucratic layers between an engineer and a decision. Ideas move fast, and ownership is real rather than theoretical.
The culture at Joy_ values speed, ownership, and directness. Engineers are expected to partner with other teams from the earliest stages of a feature, not just receive tickets and execute on specifications. Discovery, architecture, and shipping are all part of the same job.
The company has also built AI tooling into its everyday workflow. Using AI tools to iterate quickly is not a future aspiration here. It is already part of how the team operates, and new engineers are expected to embrace that approach from day one.
Work Environment and Office Setup
Joy_ has a strong center and a physical office in Berlin. The team is spread across Europe, so the work environment blends in-person collaboration with remote coordination. Berlin remains the gravitational hub for the engineering team.
Working in a twelve-person company means the office feels nothing like a corporate environment. Decisions get made in conversations, not through layers of approvals. Engineers sit close to founders, commercial leads, and product thinkers at the same time.
For developers who find large open-plan offices with dozens of strangers draining, Joy_'s setup offers something different. The environment is compact, high-context, and built around people who have chosen intensity over comfort in their careers.
Team Structure for Full-Stack Developers
The engineering team at Joy_ is growing from a small but proven foundation. As a full-stack engineer, you work across the entire gift card product. That means both the customer-facing screens and the backend services powering them fall within your scope.
Daily responsibilities include:
- Owning features from discovery through to production deployment
- Designing architectures in collaboration with senior engineering peers
- Building and refining the gift card experience, from purchase to redemption
- Developing APIs, backend services, and data models
- Leveraging AI tools to accelerate iteration cycles
The structure is deliberately flat. You collaborate closely with senior peers, but ownership is distributed rather than concentrated at the top. Engineers do not wait for permission to think about the product.
The Technical Scope of the Role
Full-stack at Joy_ means genuine full-stack. The frontend covers the customer journey through gift card purchase and redemption. The backend handles the APIs and services that connect Joy_'s Universal Purchasing Infrastructure to that customer experience.
Working inside a live, production infrastructure at this scale is technically demanding in ways that prototype-stage companies cannot replicate. The systems already handle real transactions across real shops. Engineers joining now are building on top of something proven, not speculative.
The AI angle adds another layer of technical interest. Joy_'s infrastructure is designed to allow AI agents to complete purchases autonomously, without human intervention. That is not a marketing claim. It is an engineering reality the team maintains and expands every day.
Growth Opportunities Inside Joy_
Joining a team of twelve at the beginning of its growth phase creates a specific kind of career trajectory. Early engineers at companies that scale tend to accumulate influence, institutional knowledge, and responsibility at rates that simply are not possible inside larger organizations.
At Joy_, the gift card vertical is the first live business model on the infrastructure. Additional business models will follow as the platform matures. Engineers who join now will have direct exposure to how those new models get designed and built.
The company has raised from top European funds and angels who have built and scaled some of Europe's most significant tech and commerce companies. That backing signals both the seriousness of the ambition and the quality of the network surrounding the team.
Growth here is not measured in job title changes or annual review cycles. It is measured in the scope of problems you take on and the decisions you influence directly. For engineers who want that kind of acceleration, the environment is unusually well-suited.
Work-Life Balance at Joy_
Honesty matters when discussing work-life balance at a company like Joy_. This is a twelve-person startup operating in a competitive, technically complex space. The pace is high. Expectations around ownership and output reflect that reality.
That said, Joy_ is not a company that glorifies burnout as a cultural value. The team is small and spread across Europe, which means asynchronous working habits are built into daily life. Engineers are trusted to manage their own time and energy rather than being managed through surveillance of hours.
The distributed nature of the team also means that rigid nine-to-five structures do not dominate. Flexibility exists, but it comes paired with accountability. You are expected to deliver, and you are trusted to manage how that delivery happens.
For developers who thrive in high-ownership environments and find bureaucratic constraints more exhausting than demanding workloads, Joy_'s model works well. For those who need strict separation between work hours and personal time, the startup setting requires honest self-assessment before applying.
Who Fits Well at Joy_
The type of engineer who thrives at Joy_ shares some consistent traits. They are comfortable with ambiguity. They want to understand the business context of their technical decisions. They default to action rather than waiting for full information before moving.
Strong candidates typically bring:
- Genuine full-stack experience across frontend and backend systems
- Comfort working in fast-moving, production environments
- A habit of thinking about product and architecture simultaneously
- Experience or interest in working with AI tooling as part of daily workflow
- An appetite for ownership that goes beyond writing code
The company is building something with real commercial traction and global infrastructure ambitions. Engineers who want to connect their technical work to visible business outcomes will find that connection easier to draw at Joy_ than at most other employers.
How to Apply
Joy_ is currently growing its engineering team in Berlin. The Full-Stack Developer (m/f/d) role sits at the center of that expansion. If working on live infrastructure, inside a small high-trust team, at the intersection of AI and e-commerce matches what you are looking for, the application link is below.
You can apply directly for the Full-Stack Developer (m/f/d) position at Joy_ through this link: https://www.arbeitnow.com/jobs/companies/joy/full-stack-developer-berlin-338700
