Senior Backend Engineer (m/f/d)

Why this role matters

JOIN helps thousands of businesses find the right people — faster, fairer, and with less friction. Our platform handles millions of candidate interactions, and our clients praise JOIN’s attention to detail and unmatched user experience.

As our Backend Engineer in Barcelona, you’ll join us at an exciting moment: the launch of our new office in Spain! You’ll play a key role in shaping the future of our product and platform, working with a modern tech stack to deliver robust, scalable features. This isn’t just another job – you’ll be part of building a new engineering hub from the ground up.

What you’ll be doing

Your work will directly impact how thousands of companies and candidates experience hiring. Here’s what that looks like:

• Collaborate with frontend engineers, product managers, and DevOps/platform teams to build meaningful features through our Agile SDLC/Kanban workflow.
• Conduct peer code reviews and contribute to retrospectives to drive continuous improvement.
• Define technical requirements and identify the best solutions to meet team goals.
• Participate in engineering retrospectives focused on testing, architecture, automation, and coding standards.
• Always think beyond the code - you’ll focus on delivering value and improving the user experience for our customers.

Who you’ll work with

You’ll join our Backend Guild, collaborating closely with Product, Platform, DevOps, and Frontend teams. We care deeply about quality, performance, and a great developer experience – supported by clean architecture, code generation, linters, templates, and test-driven development.

What we’re looking for

We don’t believe in checklists - but if most of these apply to you, we’d love to chat:

✔ 5+ years of backend development experience.

✔ 2+ years of experience with a strongly typed language or TypeScript.

✔ Strong experience with RDBMS (raw queries or via ORM).

✔ Solid background in unit and integration testing.

✔ Experience with message brokers (SNS, RabbitMQ, Kafka, Google Pub/Sub, etc.).

Bonus: Experience with Node.js, GraphQL, GCP or AWS, gRPC and protobufs.

Bonus: Strong grasp of SOLID principles.

Our Values

🚀 Impact Over Effort – We optimize for outcomes, not hours. What matters is the impact we generate for our teams and customers.

💡 Yes, You! – It starts with you. We take ownership, act with initiative, and don’t wait for permission to make things better.

❤️ We Grow Together – As individuals and as a team. We invest in each other and get stronger collectively.

🛠 Ambition At Scale – We think big. We’re building something that matters, and we set the bar high for what’s possible.

We thrive in a fast-moving, collaborative environment. That means adapting quickly, challenging each other constructively, and spending meaningful time together in the office while trusting each other to work flexibly:

• We love collaborating in the office sharing knowledge with all colleagues, and we do understand the flexibility of working from home when needed
• We adapt quickly and embrace change in a growth-oriented startup environment
• We continuously challenge ourselves and each other to improve

This role might not be ideal if:

• You prefer a highly structured environment.
• You want a fully remote position.
• You prefer minimal change and a slower pace.
• You’re not excited about ownership and growth.

What’s in it for you?

🖥 Apple hardware – The best tools for the job (MacBook).

🏆 Team events – Brunches, sports activities, and quarterly gatherings in Berlin.

🌍 Productivity from Everywhere – 104 days per year remote (post-probation), following our hybrid policy.

🏦 Competitive salary – Tailored to align with your experience level.

🏠 Relocation support – Assistance with paperwork, travel, and one month of furnished accommodation.

What to expect from the hiring process

We respect your time and keep things transparent:

1️⃣ Intro call (~30 min) – Let’s see if we’re a good match.

2️⃣ Hiring Manager Review – Your profile is assessed for technical and team fit.

3️⃣ Hiring Manager Interview (~60 min) – Dive into expectations and team dynamics.

4️⃣ Technical Interview (~60–120 min) – Demonstrate your skills.

5️⃣ Meet the Team (Optional) – Connect with your future colleagues.

You’ll always know where you stand - no black holes, no ghosting.

We welcome applications from individuals of all ages, abilities, genders, religions and diverse backgrounds. If you need assistance during the hiring process or in the workplace, let us know!

Don’t meet every requirement? No problem! We’re always open to exceptional candidates and value diversity in all forms.

📩 Apply now – We’d love to connect with you!