Software Engineer · Full-Stack · End-to-End Ownership

Hand me a problem. I'll hand back a working product.

I work like an embedded product team of one: I take a problem from rough idea to a running product — design, build, deploy — with minimal hand-offs in between.

Start a conversation → fmunhozafonso@gmail.com /resume.pdf — the full record

Operating Model

I tend to take a problem end-to-end — design, build, deploy, and the parts no one volunteers for: auth, billing, the deploy pipeline — so it lands as one decision instead of a chain of hand-offs.

I'm comfortable across the stack and across languages, so I can usually reach for the tool a problem wants rather than the one I happen to know. I lean on AI as a multiplier on delivery speed — it's a big part of why the work below — a venture firm's internal platform, two commercial products of my own, and the AI-first product I'm building now — each shipped from one pair of hands. I've also led a small team, so I'm comfortable coordinating when a problem is bigger than one person.

Flagship · Internal platform, shipped solo

Niterra Ventures

The investment team's work lived across a CRM and a stack of spreadsheets. I built one internal platform to bring it together — and it became how the team works.

Built for the venture arm of Niterra Group, it's the system of record for the whole investment lifecycle: portfolio companies and their quarterly financials, editable cap tables, scenario-based exit models, a deal funnel, expense & contract tracking, board-deck generation, and P&L / balance-sheet reporting — fed by live integrations and mapped Excel imports.

stack · SvelteKit · Svelte 5 · Bun · TypeScript · Tailwind 4 · shadcn-svelte · Drizzle / Turso · Zod · Lucia auth · LayerChart · TipTap · pdfkit · deployed on Vercel

integrates · Affinity CRM · PitchBook · Webflow

What it changed

120h → 1 day

Quarterly portfolio deck

Took the senior principal ~120 hrs by hand each quarter. The tool exports it in seconds; he finishes it by hand in about a day.

40+ users

Across the firm

The investment team's daily system of record — 10+ of them in it 2+ hrs a day.

8 → 1

One source of truth

Eight sprawling Excel sheets — some enormous — consolidated into one platform.

~1 hr / co / qtr

Saved on report intake

Quarterly company reports map straight in from Excel — no re-keying, every quarter, every company.

Inside the platform

The screens the investment team lives in — portfolio, exit models, cap tables, spend and board decks — that replaced the CRM and eight spreadsheets.

Niterra Ventures portfolio dashboard — invested capital, exit-value range and average TVPI above a quarterly revenue trend, recent movers and a projected exit timeline — Portfolio dashboard — invested capital, exit-value range and TVPI up top; a quarterly revenue trend, recent movers and a projected exit timeline below.

Niterra exit-valuation model showing enterprise value and MOIC across low, mid and high scenarios beside a performance-ratio panel — Exit modeling — enterprise value and MOIC across low / mid / high scenarios, with a live performance-ratio panel.

Exit modeling · the showpiece

A live scenario model from entry to exit, with the waterfall and comps a real diligence deck would carry.

The analytical heart of the platform — the scenario math a diligence team builds by hand, made live and reusable across the whole portfolio.

Portfolio & companies

Every holding, its rounds and ownership, and per-company financials tracked against plan.

Niterra companies list — every portfolio company with its rounds, investment stages, carry value and ownership — Companies — every holding with its rounds, carry value, ownership and major rights.

Niterra per-company financial detail with revenue and net-income charts versus plan and liquidity ratios — Per-company detail — revenue, net income and cash generation vs plan, with quarter-over-quarter growth, runway and per-metric variance.

Cap tables & deal flow

Niterra editable cap table — rounds, per-investor ownership and fully-diluted shares auto-computed from investments — Editable cap table — rounds, per-investor ownership and fully-diluted shares, auto-computed from the underlying investments.

Niterra deal funnel tracking conversion across the investment pipeline stages — Deal funnel — conversion from intake to investment across the pipeline, with drop and long-term-follow lanes.

Spend & forecasting

Niterra expenditure dashboard with spend versus budget broken down by domain — Expenditure tracking — spend vs budget by domain, with a paid / forecasted split.

Niterra forecast-accuracy report comparing forecasted and actual spend per engagement — Forecast accuracy — forecasted vs actual spend per engagement, scored by variance.

Board decks & reporting

Niterra presentation builder showing investment composition, a frozen portfolio snapshot and per-company sections, exported to PowerPoint — Presentation builder — composition, frozen snapshots and per-company sections, exported to PPTX. The portfolio deck, in seconds.

Niterra financial reports — a profit-and-loss table across quarters with balance-sheet, cash-flow and KPI tabs — Financial reports — P&L, balance sheet, cash-flow and KPI tabs, per company.

Venture Lab · Niterra Group

Screens from a public demo seeded with fictional data — no real portfolio data shown.

What I'm building now · AI-first product, solo

Crisálida

Brazil's independent healthcare professionals end their day with the notes still unwritten. I'm building the workspace where the AI writes the draft — and nothing is official until they sign.

Crisálida puts a solo practice in one place — agenda, patients and clinical documents — with an assistant that actually works the workspace: it searches the record, drafts session notes and reports citing their sources, books appointments, and asks before it changes anything. Drafts open in an editor the professional owns; a signature makes a document official and locks it for good. Built in Portuguese for psychologists, speech therapists, physiotherapists and nutritionists.

stack · SvelteKit · Svelte 5 · TypeScript · Bun · Tailwind 4 · shadcn-svelte · Drizzle / Turso · TipTap 3 · jsPDF · custom auth (Argon2) · OpenTelemetry · deployed on Vercel

ai · Vercel AI SDK · OpenRouter (model-agnostic) · 12 tools · streaming · human-in-the-loop action cards · source citations

How it's built

12 tools

An assistant with hands

The agent searches patients, reads the record, drafts documents and books appointments — every mutation becomes an in-chat card the professional confirms before it runs.

Ask · Review · Sign

The trust loop

The AI drafts from the patient record and cites which sessions it drew from; nothing is official until signed, and signed documents never change.

56 e2e tests

Solo, but disciplined

15 Playwright suites, a unit-coverage ratchet, ADRs and PR-based reviews — six months and 130 commits of building like a team.

Inside the workbench

One surface: the patient's record on the left, the document in the middle, the assistant docked on the right. The screens below are a demo workspace — the product itself speaks Portuguese.

Crisálida workbench — the patient context rail on the left, a signed insurance report in the document editor, and the AI assistant docked on the right — The workbench — a signed insurance report beside the assistant that drafted it, with its sources cited from the record.

Crisálida draft view in the dark warm-loam theme — an AI-drafted school report open in the editor, awaiting the terracotta sign action — The draft view in the dark “warm loam” theme — the one dark moment in a product designed to feel like a calm consulting room.

The signature moment · draft → signed

A drafted school report waiting on the product's one irreversible action. Sign is the only loud button in the interface — everything else stays consulting-room calm.

Live at crisalida.app — real auth, real agenda, a real AI loop with confirmations. Pre-launch, moving weekly.The whole product — brand, UX, agent design, telemetry — from one pair of hands.

The assistant, working the day

Not a chat bolted on — the same agent plans the day, flags pending notes, and drafts against the record.

Crisálida assistant chat planning the morning — reading the agenda and offering to prepare the day's documents — Morning planning — the assistant reads the agenda, surfaces a session missing its note, and offers to prepare documents before the day starts.

A signed report in Crisálida — sealed as immutable, with the sessions the AI drew from cited in the footer — A signed report — immutable, with its sources pinned to the footer: which sessions the AI drew from, on the record.

Agenda & patient records

The unglamorous foundation — scheduling and patient records — built first, so the AI has something true to draw from.

Crisálida weekly agenda with individual, couples and telemedicine sessions across the week — The weekly agenda — individual, couples and telemedicine sessions. The assistant can book into it; you confirm before it does.

Crisálida patient record — clinical picture, health-plan details and the patient's documents in one view — The patient record — clinical picture, health-plan details and every artifact, one click from the workbench.

Calm by design

Templates set the structure the AI writes into, and the day opens on what's unfinished — not on a dashboard.

Crisálida today view — the day's sessions with the notes still pending, ready to be drafted — Today — the day's sessions and the notes still unwritten. The workbench opens on what needs a signature, not on vanity metrics.

Crisálida templates — reusable document templates with ordered sections and style guidance — Templates — reusable document recipes with ordered sections. Import an old report and the AI turns it into a template.

Crisálida · crisalida.app

Demo workspace with fictional patients — no real clinical data shown · pre-launch, in active development.

Shipped Solo / Two Commercial Products

Shipped Solo / Developer Tool

writequit.dev

Freelance developers juggle tasks, time, and invoices across three disconnected tools — and lose the thread.

A full commercial SaaS — task manager, time tracker, invoice generator — in one terminal-native tool with vim keybindings and markdown tasks.
Auth (WorkOS), invoice generation (jsPDF), real-time chat and shared client boards (Convex), password-gated permissioned sharing.
The product design, the opinionated UX, and the marketing voice — not just the code.
SvelteKit 5 · Convex · Tailwind 4 · deployed on Vercel.

writequit task board: markdown tasks, a running timer, and status filters in one terminal-style view — The board freelancers live in: markdown tasks, running timer, status filters. “manage work, not a workspace.”

writequit time-tracking sessions with a live running timer — Time tracking with live running timers — part of the same tool, not a second app. “tasks. time. invoices.”

writequit invoices generated as PDFs — jsPDF invoice generation — billing built into the same tool, not bolted on.

writequit shared client board management with a share URL, password, and a live chat panel — Password-protected client boards with live chat (Convex) — permissioned sharing, real-time.

the public client view of a writequit shared board, unlocked, with live chat — What the client sees: a password-unlocked board with live chat — the sharing surface, from the other side.

REC00:48:21:stop

A complete, billable product — auth to invoice to live client collaboration — shipped end-to-end by one builder.The tool I run my own client work through — how clients receive invoices and watch progress.

a tool, not a lifestyle · write. quit. ship. · for developers who'd rather ship than organize

Shipped Solo / Consumer Product

pondera.casa

Choose the right house — without getting lost along the way.

Choosing a property means drowning in tabs and gut feeling. pondera turns a pasted listing URL into a structured decision — real scraping and LLM extraction, not a chat box — then curates, compares, and ranks.

Next.js 16 · React 19 · Convex · OpenRouter (gpt-4o-mini)

Paste
pondera.casa
Paste a link; AI extracts price, area, photos and a pros / cons / watch-outs card. No data entry.
Score
pondera.casa
Score each property on a checklist; portfolio stats update as you go.
Compare
pondera.casa
A side-by-side table with best value per criterion highlighted in gold.
Decide
pondera.casa
AI ranks the options and explains each position in plain language. You decide.

Real AI work — scraping, extraction, curation, ranking — wrapped in a polished consumer product and its marketing site, shipped end-to-end.Live and public at pondera.casa — real scraping and LLM extraction, not a demo.

Selected Work / Precision-Ag Platform · Web + Mobile

Flora — Santos Lab

Agronomists needed drone, satellite, and field data fused into something they could read on a map — and capture offline in the field. I built the React/TypeScript platform (Leaflet + Turf.js) and an offline-first React Native field app, and grew from developer into Tech Lead of five.

Flora interactive map fusing drone, satellite and field data with geospatial analysis — Drone, satellite and field data on one interactive map (Leaflet + Turf.js geospatial analysis).

Flora offline-first React Native field-collection app showing a selected farm — Offline-first React Native field app — the same platform, collected where there's no signal.

Flora analytics dashboard with custom charts turning geospatial data into decisions — Analytics dashboards and custom charts turning raw geospatial data into decisions.

Flora filtered map with analysis layers — Filtered map + analysis layers — 100+ farms and thousands of hectares, used by ~20 agronomists.

A web + mobile platform that put multi-source geospatial data in one place — and the case where I went from building to leading the build, developer to Tech Lead of 5.

Selected Work / Systems Behind the Screens

The systems users never see

HomeOptions' real engine was internal. For a call-center sales operation I owned a custom SvelteKit CRM wired into Twilio's call center, an AI-assisted call-handoff tool, and a Go/HTMX compliance & debt-settlement platform — the systems that don't screenshot well but run the business.