11/13/2026 updated

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Senior AI & Full-Stack Engineer | Production agents, SaaS & mobile

Montijo, Portugal
Only remote
BSc Computer Engineering; MSc AI & Database Management (Instituto Superior Técnico, Lisbon)
Montijo, Portugal
Only remote
BSc Computer Engineering; MSc AI & Database Management (Instituto Superior Técnico, Lisbon)

Profile attachments

curriculum.pdf

About me

Portugal-based AI & Full-Stack Engineer building production agents, SaaS and mobile products since 2017. Python/FastAPI, LangGraph, TypeScript, React/Next.js and Node.js. End-to-end ownership, clear written updates and async-first remote delivery. Founder of Doozle.

LangChainSoftware as a ServicePython (Programming Language)Node.jsNext.jsReact.jsMulti-Agent SystemsFull Stack DevelopmentReact Native
I build AI systems, SaaS platforms and mobile products that turn complex workflows into useful software.

I'm Matheus Mello, a Portugal-based software engineer and founder working in software since 2017. I take ownership from technical discovery and architecture through implementation, testing, deployment and iteration.

What I can deliver
• Production AI agents: tool calling, multi-agent orchestration, RAG over documents and business data, structured outputs, evaluation and failure handling.
• SaaS and internal tools: customer workflows, dashboards, API integrations, background jobs and PostgreSQL-backed services.
• Web and mobile products: React/Next.js applications and React Native/iOS/Android delivery, including subscriptions and store releases.

Selected experience
• Built a confidential multi-agent platform connecting SQL, CRM and internal knowledge with Python, FastAPI and LangGraph.
• Delivered AI-enabled application architecture and model-provider integrations at PromptifyPro.
• Improved broker-platform workflows, concurrent-request caching and MLS integrations at Mosaik.io.
• Built property-management SaaS features and operational automation at Nupace.
• Progressed from software engineer to mobile lead and team lead at ARIVE; I now also run Doozle, a product studio with published iOS and Android apps.

Core stack: TypeScript, React, Next.js, Node.js, Python/FastAPI, LangGraph, PostgreSQL/pgvector, Supabase, Redis and Ruby on Rails.

I work remotely in English and Portuguese, with clear written updates, scoped milestones and async-first collaboration. Capacity and meeting windows are agreed for each engagement.

Have a product to launch, an AI workflow to operationalize or an existing system to improve? Share the outcome you need, and I can help define a practical first milestone.

Portfolio: https://doozle.io
AI consulting: https://www.quantivo.ai/founder
Code: https://github.com/thematheusmello

Experience

Professional experience5 - 10 years
Freelancer since2018

Languages

EnglishFluentPortugueseNative speaker

Project history

Senior Full-Stack / AI Developer

PromptifyPro

Internet & IT

Built the front-end and back-end architecture for an AI marketing assistant that helps businesses find their audience and craft go-to-market strategies. Implemented an advanced AI agent that interacts with the entire database, plus a reusable front-end component library used across the app. Integrated multiple AI providers and models (OpenAI, Anthropic/Claude, Grok) with intelligent model routing. Wrote unit, integration and e2e tests; debugged with Sentry. Stack: Next.js, LangChain, LangGraph, Claude, multi-provider LLMs, AI agent development.

Senior Full-Stack Developer

Mosaik

Internet & IT

Senior full-stack engineer on a proptech SaaS platform connecting brokers with their clients and leads. Designed a caching system to process many concurrent requests efficiently, redesigned existing front-end features for a better UX, and integrated multiple MLS data sources. Contributed to AI/LLM agent capabilities across the product. Stack: React, PostgreSQL, Node.js, Redis, MongoDB, AWS, RabbitMQ, LLM / AI agent development.

Chief Technology Officer (CTO)

Ogmi GmbH

Internet & IT

Set the technical vision and roadmap for a real-time multiplayer trivia platform scaling to thousands of concurrent players. Led a multidisciplinary team of engineers, game designers and QA. Drove the move to a microservices architecture (−50% server cost, −40% response time), integrated WebSocket real-time battles, and built a CI/CD pipeline (−70% deploy time). Added analytics and monitoring for data-driven decisions (+20% MAU) and shipped new game modes (+25% engagement/retention). Stack: React, Ionic, TypeScript, Ruby on Rails, Node.js, Redis, Next.js, Tailwind CSS.

Tech Lead

Arive

Internet & IT

Led a team of 8 engineers building a q-commerce platform delivering favourite brands to the doorstep in under 2 hours. Designed and shipped scalable APIs and background workers end-to-end — from requirements and partner dependencies to implementation, testing, and configuring metrics, alarms, monitors and dashboards. Enriched observability with telemetry and correlated logging. Established CI/CD, code reviews and load/stress testing. The company raised €30M+ and expanded across countries, serving millions of requests daily. Stack: React Native, Node.js, JavaScript, Kubernetes, MongoDB, Firebase, GitLab.

Full-Stack Web Developer (Founding Engineer)

SheerMe

Internet & IT

Founding engineer on a wellness & beauty marketplace for discovery, booking and payments, powered by a virtual wallet and cashback ecosystem. Built the web platform and mobile app with geo-location search, plus admin and experimentation platforms (A/B, auto-targeting, multivariate testing). Delivered the API and admin panel with Ruby on Rails and Elixir/Phoenix, and the front-ends with React and React Native. Deployed on AWS/Heroku with Redis. Grew from MVP to thousands of users. Stack: Ruby on Rails, Elixir, Phoenix, React, React Native, AWS, Redis, Firebase.

Certificates

Meta Database Engineer

Meta

2025

EF SET English Certificate

EF Education First

2025

Meta Back-End Developer

Meta

2024

Meta Front-End Developer

Meta

2023

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