Senior Software Engineer (Node.js, Kafka)

Gramian Consulting Group; Lyon; Sur place; EUR 90 000 - 130 000; Plein temps

Avantages offerts par ce poste

Company restaurant

On-site gym

Profit-sharing

Growth opportunities

Modern engineering culture

Résumé du poste

Gramian Consultancy is seeking a Senior Backend Engineer to join the Poker engineering team and design, develop, and optimize highly scalable microservices powering a large-scale real-time gaming platform. You will work on distributed, event-driven systems with high throughput, collaborating with infrastructure, frontend, data, security, and product teams.

The role requires CPGE scientifiques and offers a permanent CDI contract with a 4-day work week, onsite in Paris (75007).

Qualifications

• Experience building backend services on high-traffic platforms.
• Strong knowledge of distributed architectures and microservices.
• Experience deploying on AWS and with Docker/CI/CD.
• Academic CPGE scientifiques is required.

Responsabilités

• Design and evolve distributed backend architecture.
• Develop highly available microservices.
• Build APIs and data models.
• Work on real-time event-driven systems.
• Deploy and operate services in AWS.
• Monitor and optimize platform performance.

Connaissances

Backend architecture

Distributed systems

High-traffic platforms

Node.js ecosystem

AWS

CI/CD

Docker

Observability

Load balancing

Event-driven architecture

Redis

Kafka

MySQL

PostgreSQL

Formation

CPGE scientifiques (Maths Sup / Maths Spé)

Outils

Redis

Kafka

MySQL

PostgreSQL

Node.js

AWS

Docker

Description du poste

Gramian Consultancy is a boutique consultancy specializing in IT professional services and engineering talent solutions. With a strong background in software engineering and leadership, we help companies build high-performing teams by matching them with professionals who truly fit their needs.

About the client

Our client is a leading player in the online gaming and betting industry, operating one of the largest poker and sports betting platforms in Europe. Their platform serves hundreds of thousands of active users monthly and relies on highly scalable, real-time distributed systems designed to handle massive traffic volumes with high availability and low latency.

The company combines strong technical excellence with a fast-moving product environment and offers engineers the opportunity to work on complex distributed architecture challenges at scale.

About the Role

We are looking for an experienced Senior Backend Engineer to join the Poker engineering team and contribute to the design, development, and optimization of highly scalable microservices powering a large-scale real-time gaming platform.

You will work on distributed, event-driven systems handling high-throughput traffic and real-time messaging workloads, while collaborating closely with infrastructure, frontend, data, and security teams.

This role is ideal for engineers passionate about backend architecture, scalability, distributed systems, and high-performance platforms.

Contract: PERMANENT - CDI

Model: Onsite, 4 days week!

Location: Paris, France (75007)

Hiring Process: 4 interviews - HR screening, 2 Technical Interviews, Final Meeting and Offer Discussion

NOTE: high preference for candidates who attended CPGE scientifiques — Classes Préparatoires aux Grandes Écoles scientifiques.

Key Responsibilities

• Design and evolve the architecture of distributed backend systems

• Develop highly available and scalable microservices

• Build and maintain APIs and data models

• Work on real-time event-driven systems with high throughput requirements

• Implement unit, integration, and end-to-end testing

• Participate in code reviews and technical discussions

• Deploy and maintain services in AWS environments

• Monitor, troubleshoot, and optimize platform performance

• Contribute to architecture and technical documentation

• Collaborate with Frontend, Data, Infrastructure, Security, and Product teams

• Significant experience in developing back-end services on a high-traffic platform (10K+ req/s)

• Significant experience with load balancing, high availability, scaling, caching, database, and storage issues

• Proficiency in event-driven distributed architectures

• Proficiency in Redis or Kafka (data structures, pub/sub, streams, pipelines)

• Proficiency in relational databases (MySQL or PostgreSQL), modeling, optimization, transactions, and locks

• Knowledge of JavaScript and the Node.js ecosystem is desirable (microservices rely on Node.js)

• Knowledge of the cloud environment

• DevOps culture (CI/CD, Docker, Observability)

• Mandatory academic background from CPGE scientifiques (Maths Sup / Maths Spé)

• Permanent full-time contract (CDI)

• 4-day work week

• Profit-sharing and participation programs

• Company restaurant

• On-site gym facilities

• Long-term growth opportunities

• Modern engineering culture focused on scalability and innovation