Senior Backend Engineer (Golang) - Castle Busters

Voodoo; Paris; On-site; EUR 65,000 - 85,000; Full time

Benefits offered by this job

Best-in-class compensation

Additional benefits based on location

Job summary

Voodoo is looking for an experienced backend developer to help transition Castle Busters from a client-authoritative game to a server-validated one. You will design server-side validation for game mechanics, collaborate closely with client developers, and help shape the integration between client and server.

The ideal candidate has over 7 years of backend development experience, solid understanding of Golang, and a passion for game development. It’s a chance to work on a pivotal project in a leading tech company with a global impact.

Qualifications

• 7+ years of backend development experience.
• Strong knowledge of computer science fundamentals.
• Experience in cross-functional agile teams.

Responsibilities

• Design and build the server-side foundation for Castle Busters.
• Develop server-side validation for game features.
• Collaborate with client developers and game designers.

Skills

Backend development

Golang

SQL

NoSQL

Analytical skills

Interpersonal skills

Job description

About Voodoo

Founded in 2013, Voodoo is a tech company that creates mobile games and apps with a mission to entertain the world. Gathering 800 employees, 7 billion downloads, and over 200 million active users, Voodoo is the #3 mobile publisher worldwide in terms of downloads after Google and Meta. Our portfolio includes chart-topping games like Mob Control and Block Jam, alongside popular apps such as BeReal and Wizz.

Team

Our Gaming team is made up of hybrid-casual, casual, and mid-core experts. Our 'Core' games team supports internal and external studios worldwide in creating, developing, and launching new hit games, whilst our 'Live' games team focuses on delivering higher engagement on our existing and successful games.

Joining our Live games team means collaborating with gaming industry experts on globally renowned, enduring games while embracing exciting new entrepreneurial ventures. With over seven billion downloads worldwide and a portfolio of more than 10 resilient hybrid games generating more than $20m per year, we are the world's largest and most successful hybrid publisher.

You will be part of the team building Castle Busters, a turn-based multiplayer game, working alongside its client engineers and game designers as a full member of the game team. You will be part of a small group owning the backend that this game needs as its requirements become more specific and demanding.

You’ll also be plugged into Voodoo's shared gaming backend platform - the same architecture and patterns that power titles like Mob Control and Block Jam 3D - building on it and contributing back, in close collaboration with the wider backend team. You get the focus and ownership of a dedicated game engineer with the leverage and support of a battle-tested platform behind you.

This is a pivotal hire: Castle Busters is moving towards competitive multiplayer, which means moving game logic from the client to the server. You will be central to that transition.

Role

You will design and build the server-side foundation that takes Castle Busters from a client-authoritative game to a competitive, server-validated one. The current game computes everything on the device - progression, economy, and match outcomes alike, which won't hold up for competitive PvP. Your job is to change that.

Working closely with client developers and game designers from feature design through delivery, validation and iteration, you will:

• 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.

The responsibilities are cross‑functional, ranging from infrastructure, API design & coding all the way to client-side integration (we are using Golang).

To succeed in this role, you will need to have passion for everything you do. You love to write code that scales to millions of users, are skilled at requirements gathering, champion new tech initiatives & leverage existing solutions.

Profile

• 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.

Benefits

• Best-in-class compensation
• Other benefits according to the country you reside