Senior Backend Engineer

15 hours ago

ClujNapoca, Cluj, Romania AppNiv Full time €40,000 - €80,000 per year


About Us

At AppNiv, we've partnered with HiBob, a deep tech company building a modern, cloud-native HR platform used by over 1 million people worldwide.

HiBob is a developers dream - no legacy systems, just a cutting-edge stack with Kotlin, event-driven architecture, CI/CD, and automated testing. We deploy multiple times per day and stay ahead with the latest tools and best practices. The UI is sleek, modern, and intuitive, making both the developer and user experience top-notch.

If you love high-performance, scalable systems and working in a fast-moving, innovation-driven team, youll love it here.

What Makes This Role Exciting?
  • Build real impact Your code will power integrations that ensure seamless payroll processing for thousands of businesses.
  • Modern tech stack Work with Kotlin, event-driven architecture, async processing, and cloud-native solutions.
  • High ownership Youll take features from concept to production in a CI/CD environment with dozens of daily deployments.
  • Collaboration beyond the team Work with external payroll providers and cross-functional teams.
  • Learn & grow We're looking for someone whos solid at execution but still has room to growyoull be mentored, encouraged, and challenged.
Your Mission

As a Backend Engineer, youll be key in developing resilient and scalable payroll integrations. This means:

  • Owning the entire development cyclef rom technical design to coding, testing, deployment, and monitoring.
  • Handling third-party APIs that can be unpredictable designing integrations for flexibility and reliability.
  • Working in an async-heavy environment with event-driven workflows, background jobs, and failure recovery mechanisms.
  • Collaborating with product, frontend, and external partners to ensure a smooth customer experience.
  • Continuously improving performance, observability, and system reliability.
Who You Are
  • 8+ years of backend development experience 
  • Solid experience with functional programming & microservices.
  • Experience with AWS or an equivalent cloud platform.
  • Well-versed with git-flow - you're a git power user.
  • Good understanding of SQL, NoSQL, Docker, Kubernetes, RESTful APIs
  • Strong problem-solving skills and an ownership mentality - you like to see things through.
  • Excellent communication and mentorship skills
Bonus Points (Nice to Have)
  • Backend development experience in Kotlin
  • Hands-on experience working with 3rd-party APIs, async processing, error handling, retries, and unexpected behaviors.
  • Experience with event-driven design and resilient systems.
  • Experience designing for fault tolerance, scalability, and self-healing systems.
  • A knack for AI-enhanced vibe engineering - leveraging tools like ChatGPT, Copilot, or custom scripts to boost productivity, automate routine tasks, and bring some creative energy into your workflow.
Whats in It for You?
  • Competitive salary (CIM/PFA/SRL) with regular reviews
  • Hybrid work model (1 day/week in the Cluj office) with flexible working hours
  • 4 paid wellness days per year - one each quarter
  • Awesome referral program - earn 1,000 - 2,500 per successful referral
  • Work with cutting-edge tech in a team that values growth and impact
Why Join Us?

If you're a senior backend engineer who wants to level up, take ownership, and work on real-world challenges in integrations & async processing, this is the place for you.

Ready to build something impactful? Lets talk


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