Backend Engineer (Go)

About Prelude 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. Why join us 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 LambdasBuilding 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 functionalityEnsuring that our services are scalable, extensible, reliable, and performantHelping deploy and scale our fraud prevention model to hundreds of large customersDeveloping and maintaining internal tools to improve developer efficiencyInteracting with clients on a daily basis to assist them and build features around their needsParticipating in on-call rotations to guarantee the stability and reliability of our APIs What are we looking for? Experience engineering large-scale systemsStrong coding skills in Go - any experience with Rust, TypeScript or similar is a huge plusA preference for simplicity vs complexity, with intuition for what will scale effectivelyA product led mindset, keen to code for the output and the impactFluent/professional English given our international team What can we offer you? Competitive compensation package with BSPCEs3 days in-office in central Paris, with 2 days WFH; and 4 weeks of remote work per year100% travel to the office subsidisedHealth insurance via AlanUrban Sports Club gym membershipWe will provide you with the gear you need for your role (a laptop and a phone, for on-call rotations)Swile meal vouchersFree snacks and drinks in the officeAn annual offsite in a great location The opportunity to build something from 0-1, and make an impact every day Interview process Meet a member of the Talent teamTechnical interviewIn person interview (system design, coding)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.