Lucas Freitas
Senior Full-Stack Engineer specializing in SaaS platforms, payments, and AI automation. Shipping reliable systems end-to-end (architecture → delivery) for US teams.
About
I'm a Senior Full-Stack Engineer focused on building scalable SaaS platforms, clean architectures, and reliable digital products that connect technology with real business outcomes. Over the years, I’ve worked across marketplaces, ATS and recruitment systems, educational platforms, ecommerce solutions, enterprise integrations, and custom internal tools, always balancing technical quality, maintainability, and speed of execution. My strongest background is in backend and product engineering using Go, Node.js, NestJS, TypeScript, PostgreSQL, MongoDB, Redis, Docker, and cloud-based workflows, while also delivering polished user-facing experiences with React, Next.js, Tailwind, and modern front-end patterns. I've worked with payments, authentication, automation, CMS ecosystems, and AI-powered systems, including tools and integrations involving Stripe, Auth0, Clerk, WordPress, Supabase, LLM workflows, and process automation. Beyond implementation, I care deeply about architecture, API design, developer experience, observability, performance, and shipping products end-to-end with ownership. I enjoy turning complex business rules into clear systems, improving engineering workflows with automation and AI-assisted tooling, and contributing wherever the product needs the most leverage — from backend foundations and integrations to UX refinement, technical strategy, and scalable delivery.
Experience
Senior engineering roles and high-impact deliveries. Click on any company to view details.

Bolt Group
Senior Software Engineer
Sep 2025 - Present · Remote (Las Vegas, NV, USA)
Freelance
Freelancer Fullstack Developer
Dec 2020 - Present · Remote

WEBJUMP
Fullstack Developer (Magento / AEM)
Jan 2024 - Jul 2025 · San Francisco, CA, USA

WEBJUMP
Backend Developer
Sep 2023 - Jan 2024 · San Francisco, CA, USA

Devnology
Crawler and Backend Developer
Sep 2022 - Jan 2023 · Full-time

Código_Font
Backend Developer
May 2021 - Aug 2022 · Remote
Projects
Selected case-study level work across SaaS platforms, payments and AI automation.

Row Seed
B2B Seed Marketplace
Built RFQ → quotes → checkout workflow with Stripe, enabling fast purchasing and predictable order flow.
NestJS · Next.js · Stripe · PostgreSQL
Recruit GenAI
AI Hiring Platform
Implemented AI scoring and automation pipelines to speed up candidate evaluation and reduce manual review.
TypeScript · APIs · LLM · Automation

Custom Checkout
High-Performance Payments
Designed payment flows optimized for reliability and speed, focusing on edge-friendly delivery and clean UX.
Next.js · Edge · Payments

Modern Mindset
LMS & SSO Integrations
Delivered Auth0 SSO and LMS integrations, aligning identity + learning flows for a smoother user experience.
Next.js · WordPress · Auth0 · Teachfloor

123milhas
Airline Data APIs & Crawlers
Built data extraction + API pipelines for airline ticket workflows with focus on reliability and real-time updates.
Node.js · REST APIs · Crawlers · MySQL

FUSE Health
Healthcare Platform
Worked on a healthcare platform with emphasis on secure delivery, cloud infrastructure and compliance mindset.
Next.js · Node.js · AWS · Compliance
Personal Projects
Products and platforms I am building, experimenting with and launching.
Aselora
Aselora helps local businesses launch an online storefront in minutes and start selling without complex checkout flows. Customers browse products or services and contact the store directly through WhatsApp, removing friction and making digital presence simple and accessible. This first version focuses on speed and simplicity, with many new features coming next.
Next.js · Saas · Payments · Supabase

Zumbra
Zumbra is a gentle programming language designed to make code more readable and welcoming (even for those who don't code). Born from the desire to bridge the gap between logic and language, Zumbra embraces simplicity, structure, and expression. Its clean syntax and human-friendly features aim to help learners, educators, and curious minds understand what code is really saying.
Go · Language Design · Open Source
Skills & Stack
Core Stack
Core
Also worked with
Backend
Core
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Frontend
Core
Also worked with
Payments & Identity
Core
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Engineering Practices
Core
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AI & Automation
Core
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Recommendations
Lucas Garcia
PSM I • PSPO I | Project Manager | Product Management | MBA USP (in progress) | Digital Strategy • Tech • Content Leadership
"I had the pleasure of working directly with Lucas Freitas at Grupo CCR/Motiva, where he was responsible for implementing digital content for websites on the AEM platform. He is the kind of rare professional who quickly understands requirements without the need for extensive explanations. His logical thinking is outstanding, and he often surprises with creative and innovative solutions. In addition, he automated several processes in an extremely efficient way, significantly increasing our team’s productivity. I must also highlight that he was the fastest content implementer I worked with within the group, which I consider a true differentiator. His collaborative and positive personality made the work environment much more pleasant and productive. Without a doubt, I strongly recommend Lucas Freitas for any project or challenge that requires dynamism, creativity, and operational efficiency."
André Meireles
Senior Developer / Tech Lead
"Lucas is an excellent professional, dedicated to delivering his tasks with maximum quality and speed. He quickly understands business rules and effectively applies them in code. He learns fast, is always willing to help and teach others, and working with him was a great experience."
Newmar Lucas
Software Engineer
"As a frontend developer, I had the opportunity to work closely with him while he was responsible for the backend in our team. José is an exceptional professional, consistently delivering high-quality work. In addition, his willingness to learn and explore new technologies is truly inspiring. His relaxed and positive attitude makes the work environment lighter and more enjoyable. I highly recommend José as a talented and dedicated colleague who makes a real difference on any team he is part of."
Let's work together
If you're looking for a senior engineer who can deliver results, let's connect.