Senior Backend Engineer

Licorne Society
Paris, France
19 days ago
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Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Experience level
Expert
Experience required
5 years minimum
Working hours
Regular working hours
Job source

Tech stack

Python (Programming Language) Node.Js Performance Tuning Software Engineering Real Time Systems Backend

Job description

Inside our Tech team, you’ll find five developers working with high agility. We deploy to production daily and release new app builds every week. We manage a wide range of applications (six in total), all built on very solid foundations. Our system handles tens of thousands of trips per day and hundreds of real-time messages per second between our servers and our connected vehicle fleet.

Every developer works on high-impact projects, tackling exciting technical challenges: improving performance, optimising request loads, and laying the groundwork for tomorrow’s more complex features. We’re building for scale, preparing to absorb 10 times more users and trips in the coming months, so we are looking for someone who is curious, sharp, and deeply technical with the desire to take ownership and work across a wide range of backend topics., * Feature development: Build new product features and contribute to the technical roadmap, designing solutions that balance user needs with strong technical foundations.

  • Infrastructure maintenance & improvement: Maintain existing systems, troubleshoot incidents, and continuously improve backend services.
  • Performance optimisation: Reduce recurring incidents, improve capacity planning, and optimise backend architecture to ensure scalability and reliability.
  • Complex problem-solving: Take ownership of deep technical challenges to ensure the robustness and quality of our platform.

Requirements

  • Experience: 5+ years in software development, ideally in R&D environments or within product-driven tech teams.
  • Tech stack: Strong background in Python; familiarity with Node.js or Go is a plus.
  • Problem-solving mindset: You approach problems with pragmatism, balancing quick wins with long-term solutions that scale.
  • Ownership & impact: You care about building the right thing, and building it right. You take full responsibility for your work and its impact on users and the product.
  • Communication: You express complex ideas clearly, both in writing and verbally, and adapt your messaging to your audience, whether technical or not.
  • High standards: Obsessed with clarity in code, in architecture, and in how things fit together, you bring strong opinions backed by experience.
  • Bonus (optional): Real-time systems - a first experience with high-frequency, low-latency systems and ensuring smooth communication between distributed components / IoT devices.

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