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I’m Márcio Gomes Neto, a full-stack software engineer with 6+ years of experience building and running production software for SaaS and fintech/digital banking teams. I focus on TypeScript/JavaScript with Node.js and React (including Next.js) and I’m comfortable owning features end-to-end—from REST API design and database modeling with MongoDB/PostgreSQL to UI delivery and reliability work. I also build AI-powered product features, integrating models like Anthropic Claude and Gemini and implementing guardrails, structured outputs, tool-enabled agent workflows, and context-aware sessions. In day-to-day work I’m known for ramping up quickly, resolving difficult production issues, and partnering across the team through code reviews, testing (Jest/Supertest), and incident response in English-speaking remote environments.…I’m Márcio Gomes Neto, a full-stack software engineer with 6+ years of experience building and running production software for SaaS and fintech/digital banking teams. I focus on TypeScript/JavaScript with Node.js and React (including Next.js) and I’m comfortable owning features end-to-end—from REST API design and database modeling with MongoDB/PostgreSQL to UI delivery and reliability work. I also build AI-powered product features, integrating models like Anthropic Claude and Gemini and implementing guardrails, structured outputs, tool-enabled agent workflows, and context-aware sessions. In day-to-day work I’m known for ramping up quickly, resolving difficult production issues, and partnering across the team through code reviews, testing (Jest/Supertest), and incident response in English-speaking remote environments.

MÁRCIO GOMES NETO

Full Stack Developer, Back-End Developer, Front-End Developer, +4

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I’m Márcio Gomes Neto, a full-stack software engineer with 6+ years of experience building and running production software for SaaS and fintech/digital banking teams. I focus on TypeScript/JavaScript with Node.js and React (including Next.js) and I’m comfortable owning features end-to-end—from REST API design and database modeling with MongoDB/PostgreSQL to UI delivery and reliability work. I also build AI-powered product features, integrating models like Anthropic Claude and Gemini and implementing guardrails, structured outputs, tool-enabled agent workflows, and context-aware sessions. In day-to-day work I’m known for ramping up quickly, resolving difficult production issues, and partnering across the team through code reviews, testing (Jest/Supertest), and incident response in English-speaking remote environments.…I’m Márcio Gomes Neto, a full-stack software engineer with 6+ years of experience building and running production software for SaaS and fintech/digital banking teams. I focus on TypeScript/JavaScript with Node.js and React (including Next.js) and I’m comfortable owning features end-to-end—from REST API design and database modeling with MongoDB/PostgreSQL to UI delivery and reliability work. I also build AI-powered product features, integrating models like Anthropic Claude and Gemini and implementing guardrails, structured outputs, tool-enabled agent workflows, and context-aware sessions. In day-to-day work I’m known for ramping up quickly, resolving difficult production issues, and partnering across the team through code reviews, testing (Jest/Supertest), and incident response in English-speaking remote environments.

Available to hire

I’m Márcio Gomes Neto, a full-stack software engineer with 6+ years of experience building and running production software for SaaS and fintech/digital banking teams. I focus on TypeScript/JavaScript with Node.js and React (including Next.js) and I’m comfortable owning features end-to-end—from REST API design and database modeling with MongoDB/PostgreSQL to UI delivery and reliability work.

I also build AI-powered product features, integrating models like Anthropic Claude and Gemini and implementing guardrails, structured outputs, tool-enabled agent workflows, and context-aware sessions. In day-to-day work I’m known for ramping up quickly, resolving difficult production issues, and partnering across the team through code reviews, testing (Jest/Supertest), and incident response in English-speaking remote environments.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

Portuguese

Fluent

English

Advanced

Spanish; Castilian

Beginner

Work Experience

Full-Stack Software Engineer at TextExpander (via TurnKey)

April 1, 2026 - Present

Build and ship full-stack features across a macOS application, Chrome extension, and admin/web experiences in six-week product cycles for a 100K+ user platform. Delivered tool-enabled AI agent capabilities to create and update snippets in real time, integrating Anthropic Claude and proposing/implementing Gemini as a fallback, along with AI guardrails, prompt flows, structured outputs, session/context handling, and cost boundaries. Developed feature-gated AI playground and an onboarding flow that converts user answers into starter snippets. Built REST endpoints and MongoDB schemas/models using Node.js with Express/NestJS and TypeScript, and contributed to JavaScript-to-TypeScript migrations with Jest/Supertest coverage. Used AWS CloudWatch, Lambda, and S3 for production troubleshooting, including diagnosing and fixing an IdP metadata parsing issue impacting SSO login flows. Participated in regular English code reviews across engineer levels and presented the AI agent capability to stake

Senior Software Engineer at Pay2Free

December 1, 2023 - April 1, 2026

Built and maintained full-stack features for a financial SaaS platform used by gambling operators, using TypeScript, Node.js, NestJS, React/Next.js, MongoDB, Redis/Bull, AWS, Datadog, and GitHub-based CI/CD. Supported production systems handling ~150K transactions per day, participating in outages, incident response, troubleshooting, and performance improvements. Optimized MongoDB aggregation pipelines and indexes to reduce lookups and redundant processing for payments, payrolls, users, requests, liveness, and audit/action collections. Moved heavy dashboard/report generation to Redis/Bull queues to avoid blocking synchronous requests that could exceed 30 seconds, improving admin responsiveness. Implemented and maintained security/authentication and fraud/identity-verification flows (MFA, sessions, Google auth, liveness checks, age validation, inconsistent identity data handling, and suspected identity theft). Onboarded and supported five developers and reviewed PRs; temporarily coordin

Mid-Level Software Engineer at U4C

January 1, 2023 - December 1, 2023

Developed and maintained wallet services for a white-label digital banking platform used by ~12 client organizations, covering accounts, ledger, statements, users, payments, and related workflows. Worked daily with TypeScript, Node.js/Hapi.js, REST microservices, React, Angular, PostgreSQL, and AWS CloudWatch/S3, with Jest automated tests. Integrated banking flows with Banco BV and the Brazilian Central Bank (BACEN). Delivered production hotfixes for time-sensitive issues such as PIX transfers and bill payments, including restoring boleto payment availability by implementing a fallback through Banco BV. Improved statement and database queries by expanding transaction-history retrieval beyond 30 days and tuning slower PostgreSQL queries throughout the application. Ended the role owning maintenance of an entire project, handling production bugs, user tickets, QA findings, test suites, and releases with minimal oversight.

Mid-Level Software Engineer (promoted from Junior) at U4C

October 1, 2021 - December 1, 2023

Developed and maintained wallet services for a white-label digital banking platform used by ~12 client organizations, covering accounts, ledger, statements, users, and payment workflows. Worked daily with TypeScript, Node.js (Hapi.js), REST microservices, React and Angular, PostgreSQL, and AWS CloudWatch/S3 with Jest automated tests. Integrated banking flows with Banco BV and the Brazilian Central Bank (BACEN). Delivered production hotfixes for PIX and bill-payment failures, including implementing a Banco BV fallback to restore boleto payment availability. Improved statement and database query performance, extending transaction-history retrieval beyond 30 days and tuning slower PostgreSQL queries.

Software Engineer (promoted from Junior) at U4C

October 1, 2021 - January 1, 2023

Developed and maintained production services for wallet and digital banking workflows, including REST microservices, database optimization, and reliable delivery of hotfixes for payment and transaction failures. Worked with automated testing and production monitoring tools, supporting releases and troubleshooting across the application’s core banking functions.

Junior Software Engineer at TK Soluções

October 1, 2020 - October 1, 2021

Contributed to a telecom administration platform built and released to production in roughly three months, working on both a Node.js REST API and a vanilla JavaScript/Bootstrap frontend. Continued maintaining production features and bug fixes after launch and supported GitHub-based development/release workflows.

Junior Software Engineer (promoted from Trainee) at TK Soluções

July 1, 2020 - October 1, 2021

Started as a Trainee and was promoted to Junior after ~three months. Contributed to a telecom administration platform shipped to production in roughly three months, working on a Node.js REST API and a vanilla JavaScript/Bootstrap frontend. Continued maintaining production features and bug fixes after launch, working with GitHub-based development and release workflows.

Trainee (promoted to Junior after ~3 months) at TK Soluções

July 1, 2020 - October 1, 2020

Started as a trainee and ramped up on the telecom administration platform, contributing to API and frontend work with a focus on shipping to production quickly and safely.