Felipe Oliveira Fernandes · Backend / Agent Systems Engineer
São José dos Campos, SP · Brasil · Remote · felipe.of.dev@gmail.com
About · Mission · Stack · Projects · Stats · Raid · Hire
Backend engineer building production APIs, data systems, and agent pipelines — 4+ years shipping since Sep 2022. I design systems that hold up under real traffic, real data, and real review.
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║ FELIPE OLIVEIRA FERNANDES ║
║ Role .......... Backend / Agent Systems Engineer ║
║ Tenure ........ Independent Backend · Sep 2022 → 4+ years ║
║ Location ...... São José dos Campos, SP · Brasil · Remote ║
║ Languages ..... PT native · EN professional working level ║
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| Skill | Level | Focus |
|---|---|---|
| Backend | ████████████████████░ | TypeScript/Node · Python · FastAPI |
| System Design | ██████████████████░░ | Multi-tenant SaaS · agent orchestration |
| API Design | ███████████████████░░ | REST · tRPC · Zod validation |
| Databases | ██████████████████░░ | PostgreSQL · Neo4j · Redis |
| Problem Solving | ████████████████████░ | Graph queries · CI · incident patterns |
| Collaboration | █████████████████░░░ | Code review · docs · async remote teams |
Career path: WR IT / Vox2You · Arsenal Elevadores · Independent Backend since Sep 2022.
What I do — design and ship backend systems end to end.
| Domain | Deliverables |
|---|---|
| Backend Systems | REST services, async workers, multi-agent pipelines |
| API Design | Typed contracts, validation, versioning, error models |
| Database Architecture | PostgreSQL schemas, graph modeling, migration discipline |
| Performance | Query tuning, caching, reproducible Docker environments |
| Security | RBAC, LGPD-aware design, audit trails, signed events |
Currently: production SaaS (multi-tenant), CRM platforms, fraud-detection APIs, and OSS contributions across Clojure, Python, and home automation.
Languages   
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Data & Infra   
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Agents & QA   
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Frontend touch   
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Cloud & Ops   
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Selected projects — real repos, honest scope.
| Problem | Scam job listings waste candidate time and erode trust in hiring platforms. |
| Solution | AI pipeline with structured output, multilingual signals, and Stripe-backed SaaS flow. |
| Impact | End-to-end fraud scoring API ready for production integration. |
| Stack | Python · FastAPI · PostgreSQL · Stripe |
| Link | github.com/felipeofdev-ai/trusthire |
| Problem | Regulated workflows need tamper-evident event history. |
| Solution | Append-only event chain with Ed25519 signing and governance hooks. |
| Impact | Audit integrity engine suitable for compliance-sensitive backends. |
| Stack | TypeScript · Fastify · PostgreSQL |
| Link | github.com/felipeofdev-ai/Meridian |
| Problem | PIX and blockchain flows need traceability for suspicious patterns. |
| Solution | Graph-based transaction analysis with generative-AI-assisted reasoning. |
| Impact | Trace engine for financial risk and pattern detection. |
| Stack | Python · FastAPI · PostgreSQL |
| Link | github.com/felipeofdev-ai/BridgeTrace-AI |
| Problem | Single LLM calls don't scale to complex autonomous workflows. |
| Solution | 2,000+ agent orchestration with multi-LLM routing and failure recovery. |
| Impact | Production-grade agent OS with modular financial and cognitive layers. |
| Stack | Node.js · Python · TypeScript · Redis |
| Link | github.com/felipeofdev-ai/philo-ai-os |
| Project | Focus | Link |
|---|---|---|
| forge-mcp-server | MCP tooling | repo |
| agentic-rag-cite | Evidence-based RAG | repo |
| hitl-langgraph-kit | Human-in-the-loop graphs | repo |
| secure-ship-kit | Secure shipping patterns | repo |
| SNES Quest | Interactive career portfolio | play |
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Stats refresh on demand · snake updates daily at 03:00 UTC
Turn-based battle in this README — comment commands on a Boss Battle issue; Actions update the arena below.
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║ ⚔ README BOSS RAID — TURN-BASED RPG ⚔ ║
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║ World Boss: 🏰 Legacy Monolith ║
║ "Every merged PR weakens the monolith. Your move, knight." ║
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| Command | Action |
|---|---|
/attack |
Strike — 12–28 dmg |
/defend |
Guard — −50% incoming dmg |
/special |
Code Review — heavy hit, higher risk |
/heal |
Coffee Break — +18 HP |
▶ Start Boss Battle — comment your move on the issue.
Full adventure → SNES Quest
| Rank | Knight | Boss | Turns | Score |
|---|---|---|---|---|
| — | Be the first victor | — | — | — |
Defeat a boss in a Boss Battle issue to claim the arcade.
Currently learning & sharpening:
- LangGraph checkpointing and human-in-the-loop agent flows
- Stagehand browser automation patterns for resilient ATS agents
- Nubank Clojure ecosystem (clojuredocs, matcher-combinators)
- OpenTelemetry for agent observability
How I work
| Practice | Approach |
|---|---|
| Agile | Scrum/Jira · one commit per ticket · iterative delivery |
| Reviews | Documented PRs · Loom walkthroughs when helpful |
| Docs | README-first · API contracts · runbooks for ops |
| Testing | Unit tests on algorithms/OSS · Zod at boundaries |
| Deploy | Docker reproducibility · CI/CD · Vercel/AWS hands-on |
Honest career phases — no inflated timelines.
PHASE 1 · FOUNDATIONS PHASE 2 · TEAMS PHASE 3 · OSS & AGENTS
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Backend craft · APIs WR IT / Vox2You SaaS Nubank Clojure campaign
Independent · Sep 2022 Arsenal Elevadores CRM AutoVaga · agent kits
└─ 4+ years remote └─ multi-tenant · RBAC └─ evidence pipelines
| Stage | Period | Focus | Outcome |
|---|---|---|---|
| Foundations | Sep 2022 → | Python/FastAPI · Docker · PostgreSQL | Independent Backend 4+ yrs |
| WR IT / Vox2You | 2026 | Multi-tenant SaaS · Neo4j · tRPC | Full-stack delivery at scale |
| Arsenal Elevadores | 2026 | CRM · RBAC · internal ops | Business-critical platforms |
| OSS campaign | 2026 | HA · Algorithms · Nu · Stagehand | Maintainer-reviewed contributions |
Real OSS contributions — merged and open, labeled honestly.
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Home Assistant #178110 MERGED PARALLEL_UPDATES · quality-scale |
TheAlgorithms/Python 17 merged Algorithms · unit tests · CI |
Nubank clojuredocs #88 open Re-review ready |
matcher-combinators #244 open entry-embeds opt-in |
More open contributions
| Org | PR | Status |
|---|---|---|
| Stagehand | #2561 | Open |
| NVIDIA Model-Optimizer | #2058 | Open |
| GitHub CLI | #14057 | Open |
| Nubank ecosystem | mockfn#15 · nodely#60 | Open |
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Backend Developer · Senior–Mid · Remote & Hybrid · Brasil (UTC−3) |
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║ READY TO JOIN YOUR TEAM? ║
║ → Email · LinkedIn · Portfolio above ║
║ Backend · APIs · PostgreSQL · Agent systems · OSS mindset ║
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║ S T A F F R O L L ║
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║ Backend Developer ........... Felipe Oliveira Fernandes ║
║ Stack ...................... TypeScript · Python · Postgres ║
║ Agent Systems .............. LangGraph · Stagehand · Zod ║
║ Portfolio .................. felipeofdev-ai.github.io ║
║ Special Thanks .............. OSS maintainers · reviewers ║
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— felipeofdev-ai · Portfolio · SNES Quest · Labs —