Senior Software Engineer
Back-end Engineer
Available for hire
Years of
experience
5+ years
Experience
level
Senior
Available
for
Full-time, Contract
Available from
28 Oct 2026
Senior Software Engineer with 5+ years building and operating production backend systems: APIs, microservices, event-driven services and business-critical integrations for SaaS, HR tech and financial services. I work mainly with Node.js, TypeScript and Python, focused on performance, reliability and automated testing.
Highlights
- Cut a critical external-events endpoint from 8 hours to 8 minutes (60x).
- Redesigned a monolith-to-auth-service flow, reducing ~150,000 daily auth requests per client to one.
- Optimized queries used by other teams from ~6 hours to 30 seconds (720x).
- Helped evolve a self-service integration product now used by ~500 clients across 110 integrations.
- Taught ~200 colleagues how to use AI-assisted development (Claude Code) effectively.
Looking for: a senior back-end or full-stack role (Node.js / TypeScript / Python) on a product team that values ownership, code review, testing and observability. Based in Brazil (UTC-3), comfortable overlapping with US time zones.
Skills
Languages
Employment History
Senior Software Engineer at
TOTVS
Current
2025
-
Now
- Redesigned the authentication flow between a monolith and an auth microservice, cutting ~150,000 unnecessary requests per client per day down to one, which reduced infrastructure load and cost and improved resilience.
- Reduced processing time of a critical external-events endpoint from 8 hours to 8 minutes (60x), removing a bottleneck that affected client SLAs.
- Own 7 production microservices built with Node.js and TypeScript, including a service handling ~150,000 executions per month; lead troubleshooting of reliability, performance, and integration issues.
- Cut code and service migration time from ~5 days to ~25 minutes using AI-assisted development, validating output through code review, automated tests, and functional checks.
- Taught ~200 colleagues how to work with AI-assisted development: giving models real context and clear business rules, and reviewing generated code before it ships.
- Built a dashboard mapping integrations, execution history, and client engagement, adopted by leadership, post-sales, and engineering for decision-making.
Mid-Level Full Stack Engineer at
Ahgora (TOTVS)
2023
-
2025
- Built and maintained HR integration microservices in Node.js and TypeScript, connecting the Ahgora platform to client and third-party systems through REST APIs, SOAP services, Kafka and NSQ, backed by MongoDB and Redis.
- Helped evolve a self-service integration product, now used by ~500 clients across 110 integrations, that let implementation specialists and clients configure integrations themselves, turning a ~9-month implementation backlog into setup done in minutes.
- Raised test coverage of a backend integration module from 0% to ~80% with Jest and Vitest in a daily-release environment; defined the team's testing strategy and mentored another squad to adopt it.
- Took part in architecture decisions for integration microservices and ran regular code reviews, raising code quality and team standards.
Senior Backend Engineer (Python) at
Grupo Nexxees
2023
-
2023
- Led the migration of 30 projects from a proprietary language to Python, removing vendor lock-in and making the codebase maintainable by the wider engineering team.
- Developed integrations with online payment providers and with major Brazilian banks for boleto (bank slip) registration and collections, in mission-critical flows with strict operational requirements.
- Built Docker and Docker Compose development environments matching production, reducing configuration drift and environment-related failures.
- Contributed to the evolution of the company's core Python framework used across integration projects.
Junior Backend Engineer (Python) at
Grupo Nexxees
2021
-
2021
- Optimized SQL queries used by other teams, cutting runtime from ~6 hours to 30 seconds (720x faster).
- Developed backend services in Python for large domestic and international banking-sector clients, working on mission-critical integrations with strict operational requirements.
- Automated new-project setup, reducing manual configuration and standardizing development environments.
Mid-Level Backend Engineer (Python) at
Grupo Nexxees
2021
-
2023
- Built internal Python tooling that automated library versioning, FTP uploads, ticket creation and deployment-team notifications, saving ~30 minutes per merge request.
- Automated continuous delivery steps in GitLab CI, reducing manual work and making releases more predictable and standardized.
- Developed and maintained backend integrations for banking-sector clients, handling file-based exchanges (FTP/SFTP) and data validation.
- Wrote technical documentation and helped onboard and train 5 new engineers, spreading team standards.
Education
Postgraduate Specialization in Software Engineering at
Pontifícia Universidade Católica de Minas Gerais (PUC Minas)
2022
-
2023
Technologist Degree (3-year undergraduate) in Systems Analysis and Development at
Universidade Pitágoras Unopar
2019
-
2022