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 logo

Bolt Group

Senior Software Engineer

Sep 2025 - Present · Remote (Las Vegas, NV, USA)

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Freelance logo

Freelance

Freelancer Fullstack Developer

Dec 2020 - Present · Remote

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WEBJUMP logo

WEBJUMP

Fullstack Developer (Magento / AEM)

Jan 2024 - Jul 2025 · San Francisco, CA, USA

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WEBJUMP logo

WEBJUMP

Backend Developer

Sep 2023 - Jan 2024 · San Francisco, CA, USA

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Devnology logo

Devnology

Crawler and Backend Developer

Sep 2022 - Jan 2023 · Full-time

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Código_Font logo

Código_Font

Backend Developer

May 2021 - Aug 2022 · Remote

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Projects

Selected case-study level work across SaaS platforms, payments and AI automation.

Row Seed logo

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 logo

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 logo

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 logo

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 logo

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 logo

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

Skills & Stack

Core Stack

Core

GoTypeScriptNode.jsNestJSReactNext.jsPostgreSQLDocker

Also worked with

MongoDBRedisAWSREST APIsCI/CD

Backend

Core

Go (Gin)Node.jsNestJSPostgreSQLRedis

Also worked with

ExpressSupabaseMongoDBDjangoFlaskPhoenix

Frontend

Core

ReactNext.jsTailwind CSS

Also worked with

VueViteCSS/LESSKnockoutJS

Payments & Identity

Core

StripeAuth0

Also worked with

ClerkNMIAffirmEasyPayDirect

Engineering Practices

Core

Clean ArchitectureAPI DesignObservabilityPerformance

Also worked with

MicroservicesUMLSwagger/OpenAPISecurity Hardening

AI & Automation

Core

LLM IntegrationsAutomation Tooling

Also worked with

ChatGPTClaudeCursorLovable

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.