About Voodoo
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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
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Our consumer apps teams are at the forefront of crafting innovative and engaging apps for daily enjoyment.
Our ambition extends beyond gaming to entertain a global audience. Millions of people around the world, especially in the US, download and use the apps we create.
You'll be working on Wizz, a social app specifically designed for teens, boasting over 3 million monthly active users in the US and UK. Wizz is a friend-finding and chat app where young people can safely express themselves and connect with like-minded peers in an authentic, pressure-free environment. Unlike other social media platforms that focus on followers, posts, or passive consumption, Wizz offers young people a space to have meaningful 1:1 conversations with peers.
As a member of a high-performing team of 20, you'll collaborate to further scale and enhance Wizz, fostering a spirit of goodwill and creativity. As Wizz continues its dynamic growth and development, we are seeking an ambitious Senior Backend Engineer to join.
Role
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We are looking for a Backend Engineer (Freelance) who is technically strong, proactive, product-minded, and able to take ownership of a critical transition. You won’t only write code, you will drive and execute the migration of backend services from Node.js to Golang, influence architectural decisions, and help shape the long-term technical strategy behind Wizz.
Your ability to challenge assumptions, propose solutions, and collaborate with product and engineering teams will be essential.
Your mission:
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Lead and own the backend migration from Node.js to Golang, ensuring scalability, performance, and reliability for millions of users
Collaborate closely with product \& engineering teams to contribute to technical direction and decisions
Design, rewrite, deploy and maintain highly scalable backend services in Go
Ensure a smooth progressive migration strategy with minimal operational impact
Integrate and manage third-party services (analytics, moderation, cloud tools)
Promote best backend practices in reliability, observability, and infrastructure
Improve performance for high-traffic distributed systems
Contribute to architecture evolution to support fast product iterations and safe user environments
Share knowledge and support the team in adoption of Go
Our stack
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Language and libraries: Node.js, Fastify, Socket.io, Go, Firebase
Databases: MongoDB, Redis
Infrastructure: Cloud Run, Pub/Sub, S3, CloudFront, Big Query
Ops: Github Action, AWS CLI, gcloud CLI, Docker, microservice architecture
iOS: XCode, GitHub, Cocoapods (public and private)
Profile
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Passion for consumer apps and user-centric products
Fluent in French
5+ years of backend engineering experience
Strong expertise in Node.js and Golang
Previous experience migrating or rewriting services at scale
Proficient with AWS or GCP
Comfortable with high-traffic architectures \& distributed systems
API development experience
Familiarity with our tech ecosystem is a plus
Background in social media applications is a plus
DevOps experience (Terraform, CloudFormation…) is a plus
Benefits
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Competitive salary upon experience
Wellness activities in our Paris office
Remote days on Mondays, Tuesdays and Fridays
Voodoo just won the award for Best Office Space in France