Senior Backend Engineer (TypeScript + NestJS)
Organization: 99x Brazil (formerly Nextly)
Location: São Paulo, Southeast, Brazil
Join 99x Brazil as a Senior Backend Engineer and work with a US-based, venture-funded startup building a data-heavy analytics platform for CHROs, trusted by companies like Uber, Figma, and DoorDash. You’ll be part of a senior, high-impact engineering team delivering solutions used across North America and Europe.This is a strictly backend role focused on data pipelines, APIs, and production systems. You’ll build new features, debug complex issues, and work directly with production logs in a fast-moving environment. The team is AI-forward and values engineers who actively leverage modern AI coding tools to move faster and write better software.ResponsibilitiesDesign and implement scalable backend solutions using modern technologies.Optimize existing applications for maximum speed, scalability, and reliability.Collaborate with front-end developers and designers to integrate APIs and ensure seamless user experiences.Troubleshoot and resolve backend-related issues efficiently.Conduct code reviews and provide mentorship to junior developers.Stay updated with industry trends and best practices in backend development. Bachelor's degree in Computer Science or a related field.5+ years of experience in backend developmentMust-have: Strong TypeScript and NestJS.Data proficiency: Strong SQL skills and experience with Snowflake (understanding data models/querying).Debugging skills: Comfortable working with production logs to solve real customer issues.AI-Enabled: Experience with Claude Code or similar AI coding tools is considered super valuable by the client.Nice to have: AWS, Terraform, Kubernetes experience. Your pick when it comes to employment models: CLT/PJ/Cooperativa;We provide resources for you to grow and learn on the job, including online courses, mentoring, and the latest gen laptops;A fully remote work environment with flexible working hours;Bonus for any referrals that we end up hiring.