Backend Developer - CDI

About Us:

At Heex Technologies, we are on a mission to revolutionize Data Management. As an innovative and fast-growing company, we blend cutting-edge technology, strategic insight, and collaborative energy to redefine the way businesses operate. Joining us means working alongside a team of industry leaders and changemakers while contributing to meaningful projects that impact the future.

Position Overview:

We’re on the hunt for a highly skilled and passionate Backend Developer to join our amazing team in Paris. We're searching for not just a coder, but a creative problem-solver who can craft robust backend structures, ensuring the seamless, real-time operation and scalability of our edge-first data platform.

You’ll be working hand in hand with our Engineering team, reporting directly to the Backend Tech Lead. You'll maintain and advance our Kubernetes-orchestrated microservices, with a strong focus on automated testing, system reliability, and sustainable code quality.

Key Responsibilities:

Develop and maintain high-quality, scalable, and reliable backend systems in Golang.

Work closely with the frontend and agent team to integrate user-facing elements with server-side logic.

Build reusable code and libraries for future use.

Design and optimize MongoDB schemas and queries for maximum performance.

Implement security and data protection measures.

Develop and maintain APIs (REST, GraphQL, gRPC) using Protocol Buffers for efficient client-server communication.

Build and maintain Kafka-based event streaming pipelines for asynchronous processing.

Write and maintain comprehensive unit and integration tests to ensure code quality and system reliability.

Collaborate in a team setting using Agile methodologies and GitLab for version control and CI/CD.

Troubleshoot and debug applications in production environments.

Contribute to the continuous improvement of development practices.

Languages \& Tools :

Golang

Protocol Buffers

Kafka

gRPC

GraphQL/REST

MongoDB

ArgoCD

Gitlab CI/CD

Kubernetes

Terraform

What We’re Looking For:

Master in Computer Science or Engineering degree with 2+ years of experience as a Backend Developer or similar role.

Deep Go expertise: Strong understanding of concurrency patterns, goroutines, channels, and building performant distributed systems.

Experience with MongoDB, Kafka, Protocol Buffers, and building scalable APIs (REST, GraphQL, gRPC).

Testing mindset: Proven track record of writing comprehensive unit and integration tests—not as an afterthought, but as core to your development process.

Startup resilience: You're joining a demanding, fast-paced startup environment. We need someone who can adapt quickly, work autonomously, troubleshoot independently, and stay motivated through both the challenges and wins that come with building something from the ground up.

Ownership mentality: You take pride in your work, ship quality code, and don't wait to be told what needs doing.

Communication: You are a team player and enjoy fostering collaborative relationships with other departments.

What’s in It for You?

Compensation and benefits:

Restaurant Card SWILE: 8€ per working day

Transport costs: 50% paid by the company

Mutual Insurance coverage ALAN: 70% paid by the company

Holiday Bonus: once a year on June

Hands-On Learning: Be involved in high-stakes projects that impact the company’s growth trajectory, enabling our customers to achieve their goals with our proven platform.

Fast-Paced Environment: Immerse yourself in a dynamic, startup atmosphere where your contributions make a tangible difference.

Vibrant Culture: Become part of an international team with an ambitious, inclusive, innovative, collaborative, and people-first culture.

How to Apply:

If you’re ready to make your mark and grow with us, we’d love to hear from you. Send your resume and a cover letter detailing your interest in Heex Technologies and what makes you the ideal candidate for this role to people@heex.io

Recruitment process

30min call with our HR Business Partner

45 min Interview with our Head of Engineering \& our Backend Tech Lead

Case study/technical test to evaluate your skills

30 min Interview with a potential future teammate

Welcome on board!

Heex Technologies is an equal-opportunity employer and values diversity at our company.

Let’s build the future together!

Type d'emploi : CDI

Statut : Cadre

Rémunération : à partir de 50 000,00€ par an

Avantages :

Prise en charge du transport quotidien

RTT

Travail à domicile occasionnel

Lieu du poste : Télétravail hybride (75003 Paris)