adjoe

Senior Fullstack Developer (f/m/d)

Hamburg, Germany full-time Mid Salary not listed
full-time Mid level Technology & IT Curated
Sign in to apply Free account — we bring you straight back to this role.

About the role

adjoe builds the technologies behind mobile apps growth and monetization. With our core product Playtime Arcade, we've become the global leader in rewarded advertising, an ad unit built on a simple premise: users earn real in-app rewards for engaging with new apps. The result is one of the most effective value exchanges in adtech, connecting advertisers and publishers with over 770 million users annually.

Keeping Platform Stability Front and Center for 770M+ Users
On the frontier of adjoe's most critical publisher relationships, the Partner Operations team moves fast, cuts through complexity, and contributes towards building trust and value for our partners and publishers. Operating across the full adjoe stack—backend services, SDKs, catalog, and integrations—we unblock strategic launches, build custom integrations, and resolve critical issues in production.
We act as the safety net for our product teams and the first line of defense for enterprise publishers. Beyond immediate troubleshooting, we build and scale high-impact diagnostic tooling to automate root-cause resolution across client-side and microservice architectures. Combining cross-stack technical depth with rapid execution, Product Operations ensures seamless performance wherever enterprise growth meets global scale.

Your Mission & Who We Are Looking For:
5+ years building modern full-stack web and server applications. You have solid, hands-on experience developing end-to-end platform features, with profound practical knowledge of Golang on the backend and TypeScript / React on the frontend.

A strong foundation in robust backend architecture. You contribute fresh ideas to our reliability-first Golang microservices (separated across several globally located data programming centers), constantly improving our existing code, API interfaces, and architecture for maximum efficiency.

UX-optimized frontend design & seamless API communication. You take a leading role in designing and implementing performant web and mobile frontends. You know how to show up new ways to optimize frontend-to-backend communication across protocols like REST, GraphQL, WebSockets, and HTTP.

Clean code principles and engineering best practices. You write scalable, maintainable code guided by SOLID and DRY principles, and apply common design patterns (such as HOC or factory pattern) to keep our web platforms clean and modular.

Mentorship, code quality, and team growth. You actively participate in thorough code reviews to maintain high quality standards, provide constructive feedback, and mentor junior developers to foster their growth and technical skills.

Cross-functional collaboration and adaptability. You collaborate smoothly with diverse roles across international teams. You stay updated on the latest full-stack trends, tools, and technologies, continuously proposing innovative solutions to enhance our application's capabilities.

Bonus points: Hands-on experience with cloud infrastructure and AWS services (EC2, ALB, ECS, RDS, DynamoDB), or prior exposure to other languages like PHP, Java, or Python.

🌎 We welcome applications from talent worldwide and provide relocation support to Hamburg, Germany for those ready to join our team.

What’s in It for You?
At adjoe, you’re not here to just close JIRA tickets, you’re helping build the infrastructure behind one of the most impactful platforms in adtech. The systems you work on will reach hundreds of millions of users and power billions of decisions every day.
Go Big. Own projects with impact on 770M users and push adtech boundaries.

Move Fast. Ship solutions multiple times a day, learn from results, and keep momentum.

Be Direct. Solve problems openly and collaborate across teams.

Thrive Together. Grow with a diverse, global team of people from over 40 different countries that learn from each other.

Have Fun. Celebrate wins, enjoy daily victories, and bring your energy.

We welcome applications from people who will contribute to the diversity of our company.
Find more English Speaking Jobs in Germany on Arbeitnow

Interview prep

Walk in with sharper answers.

Use this as a quick practice sheet before you speak with the employer.

Mid
Technology & IT API integration Javascript Operations PHP Mid level full-time

Likely questions

  1. Tell us about work you have done that is close to the Senior Fullstack Developer (f/m/d) role.
  2. How would you approach your first 30 days at adjoe?
  3. Which of API integration, Javascript and Operations have you used recently, and what did it help you achieve?
  4. Describe a time you solved a problem without waiting to be told exactly what to do.
  5. How do you handle busy days, changing priorities, or pressure at work?

Prepare before the call

  • A recent example that proves your experience with API integration, Javascript and Operations.
  • One short story with a problem, your action, and the result.
  • Two examples that show the strengths listed on your CV.
  • A clear reason why this role and company interest you.
  • Your availability, preferred work style, and salary expectations.

Ask them

  • What would success look like in the first 90 days?
  • What are the main problems this hire should help solve?
  • How does the team give feedback and measure good work?
  • What does a normal working week look like for this role?
Practice line

I am interested in the Senior Fullstack Developer (f/m/d) role because I can bring practical experience in API integration, Javascript and Operations, learn the team quickly, and contribute to the outcomes adjoe needs from this hire.

Related jobs.

More roles from this company or category.