Senior Backend Engineer – Golang

Jobtailor; Paris; On-site; EUR 90,000 - 130,000; Full time

Job summary

Jobtailor is seeking a Senior Backend Engineer to design and implement server-side game infrastructure, validation, and integrations with a Unity client. You will build the server foundation to enable authoritative gameplay and ensure secure metagame logic across currency, upgrades, and progression.

The role requires leadership in scalable backend systems, deep knowledge of Golang, and a track record in cross-functional agile teams.

Qualifications

• 7+ years of backend development experience.
• Strong knowledge of computer science fundamentals.
• Extreme fluency in Golang.
• Mastery of SQL and NoSQL.
• Background in high-scale systems.
• Understanding of Unix-like environments.
• Experience working in cross-functional agile teams.
• Strong analytical skills with problem-solving in scalability and performance.
• Excellent interpersonal and communication skills, able to influence teams.
• Ability to be self-sufficient and work autonomously.
• A deep interest in game development is a plus.

Responsibilities

• Design and build the server-side foundation for server-authoritative gameplay.
• Build server-side validation for metagame currency, upgrades, chest opens, and progression.
• Move toward server authority for competitive features with centralized game state.
• Design APIs and player-state management for Unity client integration.
• Ranging from infrastructure and API design to client-side integration across functions.

Skills

Golang

SQL

NoSQL

Backend dev

Distributed systems

Unix-like

Agile teamwork

Analytical skills

Communication

Autonomy

Game dev interest

Job description

Overview

Responsibilities for a backend role focused on server-side game infrastructure, validation, and integration with the Unity client.

Responsibilities

• Design and build the server-side foundation that takes Castle Busters from a client-authoritative game to a competitive, server-validated one.
• Build server-side validation for the metagame — currency, card upgrades, chest opens, and progression — staged by risk, replicating economy and reward logic on the server.
• Move toward server authority for competitive features, where game state lives in one place and can be trusted.
• Design APIs and player-state management that the Unity client integrates against, and help shape how client and server split responsibilities.
• Responsibilities are cross-functional, ranging from infrastructure, API design and coding all the way to client-side integration.

Requirements

• 7+ years of backend development experience
• Strong knowledge of computer science fundamentals
• Extreme fluency in Golang
• Mastery of SQL and NoSQL
• Background in high-scale systems
• Understanding of Unix-like environments
• Experience working in cross-functional agile teams
• Strong analytical skills with a track record of solving complex problems related to scalability, performance, and integration in high-stakes environments.
• Excellent interpersonal and communication skills, capable of influencing teams and interfacing effectively with various stakeholders.
• Ability to be self-sufficient and work autonomously.
• A deep interest in game development is a plus.