OpenLimiter
VisitA TypeScript quota meter for AI coding subscriptions on desktop, mobile and terminal.
Lucas Costa
AI Engineer · Full Stack Systems Architect & Software Developer
Five products I own and run.
Bashertz
VisitAn AI matchmaking web app helping marriage minded Jewish singles find a partner.
Perpeta
VisitLegal AI for Brazilian lawyers, with TypeScript and source checked citations.
RagnarokBR
VisitA Brazilian Ragnarok Online MMORPG with a live multiplayer server I built and operate.
BizAdemy
VisitMarketing company: websites, ads, software, SEO and AI assistants for small businesses.
Open source
OpenLimiter is a local first quota meter for AI coding subscriptions.
It reads your AI subscription quota (how much use you have left) on your own device (locally) and in real time, across desktop, mobile and the terminal, and gives coding agents a bounded budget they can check before they spend it. TypeScript, Apache 2.0, built and run by Lucas.
AI systems that run in production.
Seasmoke Hospitality · 2025 to 2026
AI concierge voice agents
Customer service and reservation calls get a natural, multi turn conversation at any hour. Real time voice agents on Vapi, ElevenLabs and LiveKit hold it, with an AI model steering the dialogue (LLM orchestration) and the fallback, escalation and error handling around it.
- Vapi
- ElevenLabs
- LiveKit
- LLM orchestration
Handles real customer interactions daily with production grade reliability.
Seasmoke Hospitality · 2025 to 2026
Multi LLM routing architecture
One AI provider is never the right answer for cost, speed (latency) and quality at the same time, so dynamic model selection through OpenRouter weighs cost, latency and task complexity in real time to pick the model for each request, with fault tolerant fallbacks that switch providers when one fails.
- OpenRouter
- OpenAI
- Anthropic
- Gemini
- DeepSeek
AI model running costs (inference) down 40 percent or more with response quality held.
Seasmoke Hospitality · 2025 to 2026
RAG knowledge systems
General AI models answer domain specific questions confidently and wrongly. Ingestion workflows turn unstructured data into Markdown knowledge bases with vector retrieval, and retrieval pipelines feed that knowledge to the agents, so they answer from those documents.
- RAG
- Vector databases
- Markdown
- Ingestion pipelines
More accurate and reliable answers for domain specific use.
Sites that run real businesses.
Healthcare staffing, jewellery, remediation, carpentry and septic treatments, across Canada.
What I do, as a system.
Software, AI systems, automation and infrastructure, built to work as one.
Software
I build the interface and the backend behind it.
Twenty years of web engineering: TypeScript, React and Next.js on the client (the part people see and use), GSAP and Three.js for motion and 3D, Node.js and PHP behind REST APIs, webhooks and databases.
AI systems
I build agents that hold up with real customers.
Voice and chat agents with tool use and MCP, multi LLM routing on OpenRouter that cut AI model running costs (inference) by 40 percent or more at the same quality, and retrieval (RAG) pipelines over Markdown and vector search.
Automation
I wire the agents into phone calls and business systems.
Real time voice agents on Vapi, ElevenLabs and LiveKit take customer service and reservation calls, and n8n workflows connect them to APIs, databases and CRMs.
Infrastructure
I deploy what I build and keep it online.
As the sole architect and deployment engineer on five production AI systems, I run them on Vercel, Cloudflare, Docker and Linux, with domain names (DNS), email and automated releases (CI and CD).
Work experience
Twenty years of experience, from São Paulo to Vancouver.
From a school website in São Paulo to AI engineering in Vancouver, with nearly a decade at Seasmoke along the way.
Seasmoke Hospitality
Sep 2025 to Present
AI Engineer
Leads AI engineering for Seasmoke products and client systems, moving from traditional web development to AI driven systems.
Architected and shipped five production AI systems as sole architect, lead developer and deployment engineer: voice agents, chat agents, RAG, multi LLM routing and n8n automation.
Designed multi LLM routing through OpenRouter around cost, latency, task complexity and provider fallbacks, cutting inference spend by 40 percent or more at the same quality, then introduced MCP servers and agentic workflows with staff training.
Jan 2017 to Aug 2025
Senior Web Developer
Managed around 35 WordPress sites for luxury resorts across Central America and the Caribbean, including 23 built from scratch.
Integrated booking engines with WordPress, PHP, JavaScript, React and Next.js for resort teams.
Owned the platform around every site: hosting, DNS, SSL certificates, themes, plugins, SEO and performance, so each property stayed fast and online.
Ran the Google Ads, Facebook Ads and LinkedIn campaigns and the promotional graphics behind them, driving direct bookings and revenue for the resorts.
EnrollmentResources.com
Feb 2015 to Dec 2016
Web Designer and Developer
Created and developed WordPress websites for universities across the USA and Canada, from fully responsive themes to the custom plugins their enrollment platforms needed.
Managed each project end to end: analysis and review of the work, client communication and quality assurance before delivery.
Officepools.com
Apr 2014 to Jan 2015
Front end UI and UX Developer
Responsible for the whole front end of the Officepools product, the website and the system's interface alike.
Designed and built the new UI and UX components and features the platform shipped, from layout to interaction.
NeoAssist.com
Apr 2009 to Jan 2014
Web Designer and Developer
Developer chief of the front end for NeoAssist's multi platform customer service tools, the multimedia servicing of enterprise customers.
Analysed and reviewed projects for the company's clients, and created websites and platforms for international accounts including Walmart, Nike, Kraft Foods, Unilever and Sephora.
Colégio Dimensão
Feb 2005 to Jan 2006
Technical support and web
Supported students upgrading their skills in Photoshop, HTML and CSS.
Designed, built and maintained the front end of the school's website, and created the graphic advertisements for its events and activities.
Universidade Presbiteriana Mackenzie
Four years of Computer Science coursework.
- Portuguese native, English fluent, Spanish conversational.
- JavaScript and software development courses over the years in Berlin, Lisbon, São Paulo and Vancouver.
Before we talk
Questions recruiters ask.
What roles is Lucas looking for, and where?
Lucas is open to AI Engineer and Senior Full Stack roles, either hybrid in Vancouver or remote. He brings twenty years of web development, ten as a software developer, and three years of applied AI work, with experience designing production systems and the full stack platforms that carry them.
What has Lucas shipped in production with AI?
Lucas has shipped real time voice agents for customer service and reservation calls, dynamic multi LLM routing that picks the AI model for each request by balancing cost, speed (latency) and task complexity, and RAG knowledge systems that turn changing documents into searchable stores for more accurate, reliable answers.
What is his stack?
His stack (the tools he builds with) spans TypeScript, React, Next.js, GSAP, Three.js, Node.js, PHP, REST APIs, webhooks and databases. For AI systems, he works with agents, MCP, evals (tests of AI answer quality), model routing, vector search and RAG, plus n8n, voice platforms, Vercel, Cloudflare, Docker and Linux in production.
How can I reach Lucas, and how fast does he reply?
Email Lucas at lucas@lucaswebsystems.com or use the contact form below. He replies fast. You can also download his resume directly for a concise record of his experience, production AI work, full stack background, education and technical skills while you wait.
Have another question?
Ask anotherLucas Costa
AI Engineer · Full Stack Systems Architect & Software Developer
Open to AI engineering and senior full stack roles, hybrid in Vancouver or remote.
- Vancouver, BC, Canada
- lucas@lucaswebsystems.com
- +1 (778) 557 6662