About Prelude

Prelude was founded by former Zenly team members who experienced firsthand the limitations of existing authentication solutions. While building products used by millions, we saw how SMS authentication had become expensive, unreliable, and vulnerable to spam and fraud, ultimately leading to the creation of Prelude.

Today, we are a team of 50 and growing, based in Paris, building products that power secure and high-performance user onboarding for companies across Europe and the US. We believe small, highly skilled teams outperform large, fragmented organizations, and we are intentional about staying focused on impact, quality, and speed.

We operate with a flat organizational structure and value in-person collaboration, which helps ideas move faster, decisions stay grounded, and teams take full ownership of what they build.

What will you be doing?

• Building and scaling a distributed system using Go, DynamoDB, SQS, Redshift and Lambdas
• Building a snappy full-stack app using cutting-edge tech (including Next on Vercel, gRPC)
• Working on the next version of the Prelude API, which we strive to be industry-leading in terms of usability, performance and functionality
• Ensuring that our services are scalable, extensible, reliable, and performant
• Helping deploy and scale our fraud prevention model to hundreds of large customers
• Developing and maintaining internal tools to improve developer efficiency
• Interacting with clients on a daily basis to assist them and build features around their needs
• Participating in on-call rotations to guarantee the stability and reliability of our APIs

What are we looking for?

• Years of experience designing and engineering large-scale systems
• Strong coding skills in Go - any experience with Rust, TypeScript or similar is a huge plus
• A preference for simplicity vs complexity, with intuition for what will scale effectively
• A product led mindset, keen to code for the output and the impact
• Fluent/professional English given our international team
• Any experience building frontends with modern frameworks like React or Vue is another huge plus

What can we offer you?

• Competitive compensation package with BSPCEs
• 4 days in-office in central Paris, with 1 days WFH; and 4 weeks of remote work per year
• 100% travel to the office subsidised
• Health insurance via Alan
• Urban Sports Club gym membership
• We will provide you with the gear you need for your role (a laptop and a phone, for on-call rotations)
• Swile meal vouchers
• Free snacks and drinks in the office
• An annual offsite in a great location (last one was at La Pradet!)
• The opportunity to build something from 0-1, and make an impact every day

Interview process

• Meet a member of the Talent team
• Technical interview
• In person interview (system design, coding)
• Final meeting with CEO