Backend Engineer (Go)

Prelude·Paris, Francemid

In short

→Ingeniero backend en Go construyendo sistemas distribuidos escalables para autenticación segura.
→Trabajas en una pila moderna (Go, DynamoDB, Lambdas, gRPC) y colaboras directamente con clientes.
→Oportunidad de impacto real desde cero en una startup en crecimiento con equipo pequeño y enfoque en acción.

Fluent/professional English given our international team

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What they ask for

✓Experiencia en diseño de sistemas a gran escala
✓Habilidades sólidas en Go
✓Preferencia por soluciones simples y escalables
✓Enfoque centrado en producto y resultados
✓Inglés fluido para equipo internacional
✓Disposición para rotaciones en servicio (on-call)

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GoDynamoDBSQSRedshiftLambdasNext.jsVercelgRPCAWSPostgreSQL

Who should you write to at Prelude?

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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?

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