Senior Full Stack Developer
2020 — Present
Eight years on site. Then code.
30+ projects shipped · 44 queues, 39 scheduled jobs · 50+ mentored · Leads 4 devs
General arrangement — the platform I build at work
Shares are non-merge commits on each default branch, measured 2026-09-18. Names of partners, brands and carriers are withheld.
- Front-ends: Check-in funnel, one deploy, every brand · 8 locales, 229 of 297 commits; Newer checkout funnels, an open login-link hole closed across three, contributor; Member zones, single sign-on across the group, contributor; Tickets storefront, seat maps · 3-D Secure, 314 of 456 commits; Back-office, the operations console, since 2022, contributor.
- API: Platform API, Express · Prisma · Zod → OpenAPI, 607 of 2,576 commits.
- State: PostgreSQL, 84 models, hand-written SQL migrations; Redis · BullMQ, 44 queues · 39 scheduled jobs; Object storage, verified documents.
- Outside: Browser robots ×10, Patchright workers, 105 of 107 commits; Payment gateways, card tokenisation · 3-D Secure; Mail · SMS · voice, webhooks in, messages out; Travel inventory · eSIM · top-ups, partner APIs; LLM, three API modules, a fallback pair in the robots.
Section A–A, one check-in, from click to boarding pass. The path runs Check-in funnel, then Platform API, then Redis · BullMQ, then Browser robots ×10, then Object storage.
- A–A · 1Nine browser runs per booking became one retry authority.
- A–A · 2A killed job now leaves a verdict, so a starved fleet no longer reads as idle.
- A–A · 3Success is the document — parsed, verified, covering every passenger — never the page state.
Proof — drawn to scale
Selected details
Each build started with a constraint. Three are drawn as details. The rest are in the register below.
Detail A
AI / Energy — Esc 1:20Open case
Detail B
AI / Fintech — Esc 1:20Open case
Stock Robot
Solo system
A quantitative trading-research system that scans stocks and crypto and pushes buy/sell/hold calls to Telegram. Short- and long-term engines for each market cross technical indicators, news sentiment and fundamentals, size positions with volatility-scaled half-Kelly, and score every call against what the price did next. Runs 24/7 as a daemon since March 2026 and is still being built, behind a test suite as large as the system it guards.
Detail C
API / Documents — Esc 1:20Open case
PDF API
Solo system
A public FastAPI service that compresses, converts, OCRs, redacts, protects and repairs PDFs. Heavy tools run as subprocesses with timeouts, and repair runs in a separate process under a memory limit, so a hostile file cannot take the worker down. It ships to Cloud Run through a keyless pipeline whose smoke test demands a 401.
As-built register
Delivered works — tabulated
| Ref | Work | Type | Team | Status |
|---|---|---|---|---|
| W-04 | Second BrainAI / Tooling | AI / Tooling | Solo infrastructure | Internal |
| W-05 | School's CoolEducation | Education | 2021 · a team of five | Internal |
| W-06 | GOAT StudiosEntertainment | Entertainment | Freelance team of 2 | Live |
| W-07 | JFP TaxisTransportation | Transportation | Freelance team of 2 | Live |
| W-08 | Tante Joke KaraokeEntertainment | Entertainment | Freelance team of 2 | Internal |
| W-09 | AI & Automation SystemsAI / Automation | AI / Automation | Sanjow | Private |
Site diary
Daily record — last 12 months
General notes
Software is a structure
Note 01
The engineer
Full Stack Developer leading a team of 4 at Sanjow, with 6+ years building scalable React/Next.js and Python applications that serve live customer traffic. I ship products end to end — from payment platforms and automation systems to AI features powered by OpenAI, Claude, and Gemini.
Note 02
The site
My background includes 8 years in Civil Engineering — managing infrastructure projects, leading field teams, and diagnosing complex structural problems — which shaped how I approach software: methodically, with attention to performance, reliability, and real-world impact across 30+ delivered projects.
Specification
Ten materials. The rest is in the resume.
- TypeScript
- React
- Next.js
- Node.js
- PostgreSQL
- Python
- Redis
- Prisma
- Playwright
- Stripe
Borehole log — BH-01
From site to system
Twelve years of ground, drilled top to bottom. Software is the made ground; civil engineering is the bedrock.
0.00Top of log, level 0.00Made ground — software, from level 0.00 to -4.00
Full Stack Developer & Team Lead
@ Sanjow
Leading a team of 4 across multi-tenant payment, travel, and automation platforms — front-end architecture plus a TypeScript backend serving live customer traffic.
- Lead a team of 4: code review, architecture, and mentoring
- Multi-gateway payment processing across multi-tenant platforms
- TypeScript backend: 84 Prisma models and 26 integration libraries behind OpenTelemetry + Sentry observability
- Distributed BullMQ fleet of 10 browser-robot workers, with robots for 8 airlines and LLM form-extraction
- White-label platform: one deploy serves 12 brands, with check-in deep links for 197 carriers
- Production AI features with OpenAI, Gemini, and the Vercel AI SDK
- A/B testing with split-URL experiments in the funnels; Lighthouse and field-data tooling for performance
Next.jsReactTypeScriptNode.jsExpress.jsPostgreSQLPrismaBullMQ
0.00Same layer, laid first and still running, from level 0.00 to -6.00
Freelance Full Stack Developer
@ Self-Employed
Custom web apps for clients and independent products of my own, taken from scoping to deployment.
- Shipped a full-stack PDF SaaS: client-side tools (pdf-lib) plus a Python/FastAPI service on Google Cloud Run with multilingual OCR and Stripe billing
- Built an AI bill-extraction tariff comparator (Google Gemini) and a Python trading-research system that runs unattended
- Real-time apps with WebSockets, GPS integration, and payment systems
Next.jsReactTypeScriptPythonFastAPITailwind CSSGSAPFramer Motion
-5.00Teaching fill, interbedded, from level -5.00 to -6.00
Teaching Assistant
@ IronHack
Mentored 50+ students in JavaScript, React.js, Node.js, Express.js, MongoDB.
- Guided students through full stack web development bootcamp
- Code reviews and pair programming sessions
JavaScriptReact.jsNode.jsExpress.jsMongoDBMongoose
-4.00Bedrock — civil engineering, from level -4.00 to -12.00
Civil Engineer
@ Multiple Companies
8 years across 5 companies spanning research, construction, diagnostics, and infrastructure.
5 positions, 2014 — 2022
- LNEC: Airport rigid pavements research (2014-2015)
- Grupo H24: Structural engineering challenges (2015-2016)
- OZ Diagnostico: Building pathology diagnostics (2016-2017)
- BuildingClass: Head of Building Pathology Diagnosis (2017-2018)
- DDN/Aguas de Cascais: Water infrastructure supervisor (2018-2022)
Transferable skills: Team leadership, complex problem diagnosis, client communication, budget management, deadlines, documentation
AutoCADSAP2000RevitMicrosoft Office Tools
-12.00EOB
End of boring — refusal on bedrock, 2014
Brief submission
Send the constraints
Goal, deadline, stack, what must not break. Hiring? A conversation about a role is just as welcome. I reply from the email on the card.
Tiago Pereira
Senior Full Stack Developer
- Emailtiagodcpp@gmail.com
- LinkedInlinkedin.com/in/tiagodcpp
- GitHubgithub.com/In-S4n3
- LocationCarcavelos, Portugal
