Portfolio signal

Brazil / backend product systems / PT-BR native / English-first portfolio

Open to software engineering roles

Resume

Savio Filho

Software engineer for backend product systems, SaaS operations, and applied AI.

My best fit is in products that need clear backend structure, predictable operations, reliable contracts, and documentation that stays useful after the first release.

I am most useful in systems that do not live only on the happy path: billing, auth, queues, uploads, tenant boundaries, approval trails, and AI features that need cost limits and human-readable guardrails. I care about the repository surface, handoff quality, and the boring details that let another engineer or operator understand the product quickly.

Where I tend to create the most leverage

The kinds of products and teams where my profile usually compounds well.

01
Backend product systems

APIs, service layers, approval flows, and repository surfaces that still make sense after the initial push.

02
Real SaaS operations

Billing, auth, queue-backed jobs, tenant isolation, and the operational detail that keeps a smaller product credible.

03
Applied AI with boundaries

AI features with cost limits, predictable fallbacks, auditable steps, and decisions that do not take the product away from operators.

What I can usually take ownership of

The scope that tends to make sense when a team needs execution with system thinking attached.

01
Contracts, APIs, and integrations

API design, authentication flows, webhooks, billing integrations, and service-to-service boundaries with clear failure modes.

02
Jobs, pipelines, and operational behavior

Queues, background tasks, upload pipelines, release checklists, runbooks, and the inspection points that keep systems predictable.

03
Docs and technical handoff

Architecture notes, READMEs, deployment guides, case studies, and repository organization that helps another engineer get to useful context faster.

Tools and layers I work with most comfortably

The emphasis here is not tool volume. It is familiarity with what tends to show up in product systems that need to survive real usage.

Languages and runtimes

  • TypeScript
  • Node.js
  • Next.js
  • Express and Fastify
  • Python
  • React Native

Data and infrastructure

  • PostgreSQL
  • Prisma and Drizzle ORM
  • Supabase
  • Redis and BullMQ
  • Object storage
  • Docker Compose

Quality and delivery

  • GitHub Actions
  • Vitest and Jest
  • pytest
  • OpenAPI
  • Technical documentation
  • Repository standards

Three reads that explain my work better than a bullet list

If I were introducing my work to a serious founder, recruiter, or tech lead, I would start with these paths first.

Read case study
01Public repository

OnboardPulse

A multi-tenant onboarding SaaS with billing, follow-up automation, storage controls, and product-like operational docs.

This project shows that I can work beyond CRUD: tenant isolation, budgeted AI usage, billing webhooks, storage policy, and cron-driven follow-ups.

02Public repository

MailSieve

A lightweight signup risk API with OpenAPI contract, key management workflow, rate limits, and deploy verification scripts.

MailSieve is a good example of a small API product where contract clarity, ops scripts, and monetization readiness matter more than feature count.

03Private case study

VOWGRID

A private case study for an agent-trust platform with simulation, policy evaluation, approvals, execution receipts, and rollback visibility.

The core signal is not just AI orchestration. It is the trust layer around execution: propose, simulate, evaluate, approve, execute, receipt, and rollback visibility.

If the role needs backend product work with operational clarity, this is probably worth a conversation.

The clearest picture of my work lives in the combination of GitHub, case studies, and technical writing. The resume helps, but the proof gets stronger when those three surfaces are read together.

  • Products with billing, auth, queues, uploads, or automation that need to stay legible after launch.
  • Teams that value documentation, explicit trade-offs, and ownership beyond the happy path.
  • Remote or hybrid environments where written clarity and technical handoff matter.