Backend Engineer (Go)

Prelude; Paris; Hybride; EUR 90 000 - 130 000; Plein temps

Avantages offerts par ce poste

BSPCEs

In-office 3 days in central Paris

2 days WFH per week

4 weeks remote work per year

Health insurance via Alan

Urban Sports Club gym membership

Laptop and phone provided for on-call

Résumé du poste

Prelude is redefining how companies authenticate and onboard users, turning what used to be a cost center into a growth lever. Our flagship product delivers OTP codes with the best price-to-conversion ratio by dynamically selecting the most effective channel in real time (optimized SMS, WhatsApp, and more) while actively blocking spam and fraud.

Based in Paris, we are 60-strong and expanding across Europe and the US, building a platform for trust at scale with a roadmap of market-defining

Qualifications

• Experience engineering large-scale systems.
• Strong coding skills in Go, with Rust/TypeScript as a plus.
• Preference for simplicity and scalable design.
• Product-minded with focus on impact and outcomes.
• Fluent/professional English in an international team.

Responsabilités

• Build and scale a distributed system using Go, DynamoDB, SQS, Redshift and Lambdas.
• Develop a snappy full-stack app with Next.js on Vercel and gRPC.
• Advance the Prelude API with usability, performance and functionality improvements.
• Ensure services are scalable, extensible, reliable, and performant.
• Collaborate with clients to tailor features and provide support.
• Participate in on-call rotations to maintain API stability.

Connaissances

Go

Rust

TypeScript

Outils

DynamoDB

SQS

Redshift

Lambdas

Next.js

Vercel

gRPC

Description du poste

Prelude is redefining how companies authenticate and onboard users - turning what's traditionally a cost center into a growth lever.

Our flagship product lets businesses send OTP codes with the best price-to-conversion ratio on the market, dynamically selecting the most effective channel in real time (optimized SMS, WhatsApp, and more) while actively blocking spam and fraud that legacy providers miss.

Founded in 2022 by former Zenly team members who lived the pain of broken SMS authentication firsthand, we're already serving fast-growing companies across Europe and are expanding into the US.

But authentication is only the starting point - we're building the platform for trust at scale, with an ambitious roadmap of market-defining products ahead.

Today, we're a team of 60 and growing, based in Paris, building products that power secure and high-performance user onboarding for companies across the world. 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 org 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?

• Experience 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

What can we offer you?

• Competitive compensation package with BSPCEs
• 3 days in-office in central Paris, with 2 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)
• Free snacks and drinks in the office
• An annual offsite in a great location
• The opportunity to build something from 0-1, and make an impact every day
• Meet a member of the Talent team
• Technical interview
• Final meeting with CEO

We don't expect you to ace all these stages, we will evaluate your creativity and how you approach difficult problems. You should consider applying even if you don't meet all the criteria.