São Paulo, Brazil🇧🇷Open to remote work

Hi, I'm Romualdo Santos.

Senior Full-Stack Software Engineer & Technical Lead

I’m a Senior Full-Stack Software Engineer and Technical Lead with 15+ years of experience turning complex ideas into scalable, production-ready products. I’ve delivered software for startups and global enterprises across finance, healthcare, AI, e-commerce, and enterprise platforms, working remotely with U.S. companies since 2020.

My work spans the complete software lifecycle: product discovery, system design, frontend architecture, backend services, data integrations, cloud infrastructure, CI/CD, and production operations. I specialize in TypeScript, Node.js, React, Next.js, GraphQL, AWS, Terraform, PostgreSQL, Redis, and distributed, event-driven architectures.

I have architected cloud-native products from the ground up, modernized large legacy systems, built data-intensive financial experiences, designed resilient processing pipelines, and solved long-standing performance and data-integrity problems. I bring the technical depth of a hands-on individual contributor together with the ownership and strategic perspective of a lead engineer.

I care about simple architecture, measurable outcomes, accessible user experiences, automated quality, and software that remains easy to evolve. I thrive in autonomous, product-focused teams, collaborating closely with engineering, product, design, and business stakeholders to take ambitious ideas from architecture to production.

Main Stack

JavaScript(15 years)

TypeScript(8 years)

Node.js(12 years)

React(8 years)

Next.js(6 years)

NestJS(3 years)

Tailwind CSS(6 years)

Docker(12 years)

SQL(12 years)

AWS(12 years)

Years of Experience

US Remote Companies

Industries Served

Projects Delivered

How I work

End-to-end ownership

I take ownership from discovery and architecture through implementation, deployment, and production support — keeping technical decisions aligned with product goals.

Flexible engagement

Available as a solo senior contractor or as a lead who brings a trusted network of engineers for larger projects — whatever fits your scope.

Remote-first

Experienced working across time zones with distributed teams. Async-friendly via Slack/Linear, highly responsive, and comfortable with weekly syncs.

Hands-on technical leadership

I lead through architecture, implementation, code reviews, and mentoring while remaining close to the code and delivery details.

Complex problem solving

I’m comfortable investigating performance bottlenecks, data integrity issues, distributed workflows, and challenging problems that cross system boundaries.

Quality by default

Code reviews, automated testing, observability, and CI/CD are part of the engineering process — not add-ons applied at the end.

Business-aware

I track metrics, validate assumptions, and communicate progress in terms that matter to stakeholders — not just technical output.

AI-accelerated, engineering-led

I use AI tools to accelerate research, implementation, and iteration while keeping architecture, validation, and engineering judgment firmly human-led.

Get in touch

Have a complex product or engineering challenge?

I can help take it from architecture to production. Tell me what you're building, where you're stuck, or what you'd like to improve.

Send me an email Connect on LinkedIn