I like solving problems so much I've built three businesses around it.
That's the actual drive, solving something real and understanding what makes someone actually pay for it, not just shipping code. I'm looking for a team where that instinct has more to build with.
This is the pattern I bring to a team: build something real, sell it myself, and go where the results are.
A prior project (Thestias) had unreliable long-range communication with stratospheric balloons. CAMO had to fix that and hit real-time performance.
Local accommodation businesses had no way to take bookings online.
Local businesses have real purchasing intent when you solve a specific, tangible problem.
Companies had messy, manual sales and ops processes, with no one in-house to map the workflow, find the real bottleneck, and automate it.
Ran conversations with Fitness Up (Portugal's largest fitness chain), CapTemp (international industrial monitoring) and Triber (brand strategy agency).
Vibe-coded apps (Lovable, Bolt, Cursor) were shipping with real security holes: exposed IBANs, disabled row-level security, API keys sitting in the browser. The companies vibe coding didn't see it as their problem. Founders did: a GDPR breach means fines up to €20M or 4% of revenue.
Audited ByTheLaw, Curya, Tapsi & IgnisVault. Several have since received investment. Visited ByTheLaw in person; the scan caught what their existing security service had missed. One paying client was enough signal that the segment wasn't going to scale, so I moved on.
Real estate agents don't want to type, they want to talk. The agent tells Siri what happened after a visit or call, and the agent figures out who the client is, which property, and what happened, then writes it straight into the CRM. No forms, no app to open. Built with LangChain/LangGraph, an OpenRouter-served LLM, Airtable as the CRM, and a FastAPI webhook for Siri to talk to.
Reusable retrieval-augmented generation framework: Postgres/pgvector-backed ingestion, hybrid search, and evaluation, built to drop into new projects by swapping in new docs and eval questions. Sweeps chunking strategy, search type, HyDE, and reranker combinations to find what retrieves best, then layers a conversational agent on top for grounded, cited answers.
Sales teams review calls by ear or skim a transcript, missing the hesitation, tone shift, or blank stare that actually predicts whether a deal closes. This pipeline reads a meeting recording the way a sharp sales manager would: voice, face, and words together, not just the words. Built after finding a Portuguese company (€5M+ revenue) whose sales-call analysis product only ran the transcript through an LLM; reached out unprompted, met their engineering team, and showed them the multimodal upgrade.
Security scanner SaaS for apps built with AI coding tools (Lovable, Bolt, Cursor). Submit a URL, get an automated scan across 24 security checks, and get back a fix file written for the same AI tool to paste in and patch. Full product: Next.js frontend, FastAPI backend, Redis, Claude/GPT-4o for the fix generation.
Portuguese movie aggregator. Pulls data from IMDb and Rotten Tomatoes to show what's playing in Portuguese cinemas.
ML pipeline that classifies 16 human activities from wearable sensor data (accelerometer, gyroscope, magnetometer): outlier detection, feature engineering, PCA/ReliefF dimensionality reduction, and a custom k-NN classifier benchmarked across 12 configurations with statistical hypothesis testing.
Google-style search engine built for a Distributed Systems course: a gateway, multiple index "barrels," and a crawler communicate over gRPC to index pages, rank results, and track backlinks across machines.
A genetic algorithm evolves the weights of a small neural network (8-12-2) to land the Gymnasium LunarLander instead of training it with gradient-based RL. Tournament selection, uniform crossover, and fitness-dependent Gaussian mutation run across parallel episode evaluations; a custom fitness function scores proximity to the pad, velocity, orientation, and leg contact. The best configuration landed successfully in 97% of test episodes across 5 independent runs, with one individual hitting 100/100.
24 Claude Code skills that turn it into an automated black-box security scanner: each phase runs as its own slash command, chaining recon through exploitation in optimized parallel waves. Powers SecureDev, the scanner built for AI-assisted app builders.
Before this site, there was Lusitai — a security scanner SaaS I built, sold, and supported myself. These are the founders and teams who used it.
“Lusitai frees you to build the first version of your app without worrying about security details. Once the features are ready, Lusitai is the perfect tool to review security and deploy with peace of mind.”
“After building multiple Vibe Coding applications, Lusitai literally increased my confidence in delivering to clients and securing their data. Before, I did manual checks, and now it's a tool that literally lives in my environment and I use it every time I do any kind of project, every week. On top of that, I talk about it to everyone I can within the community.”
“I feel much safer even without knowing anything about security. Lusitai tells me exactly what's wrong and I just have to apply the fixes in the AI. I can develop fast, launch to production and sleep peacefully, without having to become an expert in an area that's not mine.”
“Using Lusitai has significantly improved the way we approach security in our development process. Instead of treating security as a late-stage concern, Lusitai allows us to identify potential vulnerabilities early, while code is still being written. The platform fits naturally into a modern development workflow, providing clear, actionable insights without slowing teams down.”
“Lusitai did a security check-up on our custom CRM and brought us very valuable insights. They detected flaws that could compromise client and employee data when launching the internal tool and gave clear, prioritized recommendations for fixes. Besides strengthening security, they helped us prevent compliance risks and potential fines in the future. I recommend without hesitation!”
“Lusitai helped us secure our MVP quickly and efficiently. The cybersecurity report perfectly complemented our knowledge, allowing us to mitigate risks. A professional, agile service with excellent results.”
“Security in a project is always a priority and Lusitai's solution fit like a glove. The analysis was fast and the fixes were on point, clear and simple to implement.”
If you're building something early and need someone who can ship it, sell it, and stay close to customers — let's talk.
