Activate JobCopilot
This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Principal Software Engineer based in Brazil.
This is a senior, hands-on technical leadership role where you will define the architecture and long-term engineering strategy for a high-performance web and mobile ecosystem.
You will act as the main technical authority across a complex stack spanning React-based frontend applications, Node.js backend services, and ML-driven ad-tech systems.
The role combines deep engineering execution with strategic decision-making, ensuring scalability, reliability, and extreme performance optimization at every layer.
You will work closely with stakeholders to shape product direction, remove system bottlenecks, and ensure production systems operate at peak efficiency.
A strong focus is placed on performance, where milliseconds of improvement directly impact business outcomes and revenue.
You will also contribute to infrastructure design, data architecture, and optimization of machine learning pipelines powering ad-tech performance.
This is a high-impact role in a fast-moving environment where technical excellence is a core expectation.
Accountabilities:
- Own the end-to-end architecture, technical direction, and scalability of a high-revenue web platform and mobile application.
- Design and maintain server-side rendering systems using Node.js, Fastify, and React in production environments.
- Define and optimize data architecture across MySQL and BigQuery, ensuring performance and scalability at large data volumes.
- Lead infrastructure decisions on Google Cloud Platform (Cloud Run, Cloud Build, Cloud SQL, Load Balancing) to ensure system reliability.
- Drive performance optimization initiatives across frontend, backend, and infrastructure layers where latency is critical.
- Oversee ad-tech integrations and ensure systems support high-performance monetization workflows.
- Maintain and optimize ML-driven pipelines used for ad-tech performance and revenue optimization.
- Collaborate directly with stakeholders to align technical execution with product and business goals.
Requirements:
- 8+ years of experience in software engineering with strong production-level expertise in modern web stacks.
- Advanced experience with Node.js (TypeScript) in production environments.
- Strong expertise in React with server-side rendering architectures.
- Deep knowledge of MySQL, including schema design, indexing, query optimization, and ORM usage.
- Strong hands-on experience with BigQuery for large-scale data processing and analytics.
- Proven experience with Google Cloud Platform, including Cloud Run, Cloud Build, Cloud SQL, and load balancing.
- Strong system design and architecture skills with a focus on scalability and performance.
- Experience working in high-performance environments where optimization and reliability are critical.
- Nice to have: ad-tech experience (programmatic ads, yield optimization), affiliate systems (Anura, Everflow), Cloudflare, Fastify 5, Flutter, Golang or Rust, and ML applied to ad-tech.
Benefits:
- Fully remote position with flexible working arrangements.
- Competitive contractor compensation aligned with senior-level expertise.
- Paid vacation and sick leave.
- Opportunity to work on a high-scale, revenue-generating platform with complex technical challenges.
- Exposure to advanced ad-tech systems, ML-driven optimization, and large-scale cloud infrastructure.
- High autonomy and ownership over architecture and technical decision-making.
- International work environment across US and European markets.
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