Backend Engineer (Go)
At a glance
Mid-level Backend Engineering role at Prelude. Paris · full-time · €60,000–€65,000 base.
techroles summary, based on the employer's posting.
What you'll do
- Build Go-based distributed services with DynamoDB, SQS, Redshift and Lambdas, then scale them as usage grows
- Shape the next Prelude API around usability, speed and functionality while keeping services reliable and extensible
- Help roll out and scale the fraud prevention model for large customers
- Create internal tools that make developers more efficient and build features in response to client needs
- Join the on-call rotation to keep APIs stable, and help deploy a fast full-stack app
What you bring
- You have designed and built systems intended to operate at large scale
- Strong Go coding skills are required
- You work professionally in English with an international team
- You favor simple designs that can scale and write code with product outcomes in mind
Who this fits
This mid-level role suits a backend engineer who wants to build systems and API features while engaging with clients. You’ll work from central Paris in the office three days each week, with two work-from-home days and up to four weeks of remote work per year. The role includes on-call rotations.
From the employer
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.
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 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 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
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 great locations
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
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Backend Engineering€60k+
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