Full-Stack Engineer

Prelude; Paris; Hybride; EUR 70 000 - 110 000; Plein temps

Avantages offerts par ce poste

Health insurance via Alan

Swile meal vouchers

Urban Sports Club gym membership

Laptop and phone provided

Hybrid work: 3 days in Paris, 2 days W

4 weeks remote per year

Office snacks and drinks

Annual offsite

Résumé du poste

Prelude is hiring in Paris to build and scale its secure onboarding platform. You will join a small, highly skilled team focusing on performance, usability, and reliability for a global client base.

You will work across the stack—from React frontend to Go backend and data layer—shaping the API and building internal tools, dashboards, and fraud prevention features. A hybrid Paris office with some remote work is offered.

Qualifications

• Experience building frontends with modern frameworks (React preferred).
• Backend skills in Go or TypeScript with reliable APIs.
• Full-stack experience across UI to infra.
• Interest in simple, scalable solutions.
• Product‑oriented mindset with focus on user outcomes.
• Professional English in an international team.

Responsabilités

• Build polished, high-performance UI with React/TS.
• Own features end-to-end—from frontend to APIs.
• Work across the stack with Go, DynamoDB, SQS, Redshift, Lambdas.
• Shape Prelude API for usability and performance.
• Create internal tools and dashboards to boost efficiency.
• Support fraud prevention system deployment at scale.
• Interact with clients daily to gather needs.
• Participate in on-call rotations for reliability.

Connaissances

React frontend

Go/TypeScript backend

Full stack

UX mindset

English proficiency

Outils

AWS Lambda

DynamoDB

SQS

Description du poste

About Prelude

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

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.

Our values

• Care We care deeply about our customers, our teammates, and the quality and reliability of what we ship.
• Bias for Action We move fast, test in the real world, and iterate quickly rather than over-optimizing in theory.
• Ownership We take responsibility end to end, from identifying problems to delivering outcomes and learning from results.

What will you be doing?

• Building polished, high-performance user interfaces using React and Typescript, with a strong focus on usability, speed, and design quality
• Owning features end to end — from the React frontend through the Go backend, APIs, and data layer
• Working across the stack on our distributed system using Go, DynamoDB, SQS, Redshift, and Lambdas
• Shaping and building the next version of the Prelude API, which we strive to be industry-leading in terms of usability, performance, and functionality
• Designing and building internal tools and dashboards that improve developer and team efficiency
• Helping deploy and scale our fraud prevention model to hundreds of large customers
• 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 services

What are we looking for?

• Strong experience building frontends with modern frameworks : React is ideal, Vue or similar also welcome
• Solid backend skills in Go or TypeScript, with the ability to design and build reliable APIs and services
• Years of experience working across the full stack, from UI to infrastructure
• A preference for simplicity vs complexity, with intuition for what will scale effectively
• A keen eye for product and UX — you care about what the user sees and experiences, not just what the code does
• A product-led mindset, keen to code for the output and the impact
• Fluent/professional English given our international team
• Any experience with Rust, gRPC, or AWS serverless (Lambda, DynamoDB, SQS) is a plus

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)
• 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 assessment
• In-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.