Our partner is looking for a Software Engineer, Trust & Safety based in Spain.
Join a fully remote engineering team building reliable email infrastructure for millions of developers worldwide. As a Software Engineer specializing in Trust & Safety, you will design and develop sophisticated anti-abuse systems that protect legitimate senders while preventing spam, phishing, fraud, and account compromise. Working across backend services, infrastructure, databases, and machine learning, you will help strengthen platform security without compromising the experience of legitimate users. You will have significant ownership over technical decisions, from initial discovery through production deployment. This role offers the opportunity to solve complex engineering challenges in a quality-focused, collaborative, and globally distributed environment.
Build, evaluate, and deploy machine learning classifiers for spam and phishing detection, validating their precision before enabling automated enforcement.
Contribute across the full technology stack, including frontend interfaces, backend services,



databases, queues, and supporting infrastructure.
Take ownership of projects from discovery and technical design through implementation, production deployment, and continuous improvement.
At least five years of professional software engineering experience.
Strong written and spoken English communication skills.
Deep hands-on experience with Node.js, TypeScript, and React, ideally including frameworks such as Hono and Next.js.
Experience with Go or a strong willingness to use it for latency-sensitive backend services.
Solid infrastructure and reliability engineering skills, including experience with AWS, AWS CDK, and Datadog.
Strong observability practices, including metrics, logging, distributed tracing, error handling, and production monitoring.
Ability to take ownership across the stack, from frontend applications to backend services, databases, and messaging infrastructure.
Proven ex

📌 Software Engineer (España)
🏢 Lever
📍 España