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Gustavo Ferreira
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Résumé

Gustavo Ferreira · Tech Lead · Full Stack Engineer

I build products end to end — and lead the teams that ship them.

Tech Lead at Groner, the CRM built for Brazil’s solar energy industry. I design and ship core product — a native WhatsApp contact center, solar-financing integrations, field-service operations — with TypeScript, Vue, Node.js, .NET and AWS.

Core stack orbiting: TypeScript, Vue.js, Node.js, React, .NET, AWS, Docker, Next.js, SQL Server.

View my work Download résumé
Curitiba, Brazil · UTC−3
Portrait of Gustavo Ferreira
a month in vendor costs cut by GronerZap
R$30k+
developers led as Tech Lead
6
banks & credit providers integrated
4
promotions in 21 months
2

About

A product-minded engineer who still ships code

I’m a full stack engineer who likes to own problems end to end — from the first conversation with Product to the feature running in production. I joined Groner as a front-end developer on the migration of its legacy CRM; two promotions later, I lead the engineering of its core modules.

As Tech Lead I scope features with the CTO and Product, design the architecture, review code and mentor the team — and I still write a lot of it. My day-to-day stack is TypeScript, Vue and Node.js on AWS (Lambda, SQS, DynamoDB, ECS), with C#/.NET services where they fit best.

I’m based in Curitiba, Brazil (UTC−3), a timezone that overlaps with both US and European working hours, and I’m looking for my next challenge on an international team.

Currently
Tech Lead at Groner
Based in
Curitiba, Brazil
Timezone
UTC−3 · overlaps US & EU hours
Languages
Portuguese (native) · English (advanced)

Experience

From front-end developer to Tech Lead

Shipping production software since 2022 — most of it at Groner, where I grew from the CRM migration team to leading its engineering.

  1. Groner

    Dec 2023 – Present

    3 roles

    1. Tech Lead

      Sep 2025 – Present · Hybrid

      • Conceived and built GronerZap, a WhatsApp contact center native to the CRM, replacing a vendor that cost over R$30k a month; it now serves hundreds of companies and thousands of users, on Meta's official API and three other providers.
      • Built the CRM’s integrations with 4 banks and credit providers on my own — Solfácil and Sol Agora live, Banco BV and Revocred (Conectepag) in certification — from simulation and credit pre-analysis to proposals and status webhooks, working directly with the partners’ teams.
      • Conceived and maintain the Gamification module, which lets companies reward any operation, not just sales — I built its first version, rules engine and front end. Also shipped internal chat and dozens of other modules.
      • Led 6 developers across different periods; technical reference on estimates, approach, feasibility and feature sign-off with teams, the CTO and Product.

    2. Mid-level Full Stack Developer

      Feb 2025 – Sep 2025 · Hybrid

      • Developed and maintained the Groner CRM, its API and microservices.
      • Built the Service Orders module with the CTO — a field-service tool in the vein of Field Control and Auvo, rolled out at client Resolve Energia Solar — which led dozens of customers to upgrade to the top plan.
      • Built new features and solved cross-team technical problems in direct collaboration with the CTO.
      • Reviewed code and mentored junior developers.

    3. Junior Front-end Developer

      Dec 2023 – Feb 2025 · Remote

      • Worked on the migration to the new Groner CRM (formerly SafeLeads), replicating legacy features and shipping new ones with scalable, unit-tested code.
      • Fixed new and inherited bugs to keep the platform stable.
    Vue.js Quasar Node.js Express Jest TypeScript C# .NET Entity Framework AWS Lambda API Gateway DynamoDB SQS S3 CloudFront ECS EC2 n8n WhatsApp Cloud API Google Cloud Google Maps API Google Calendar API

  2. Self-employed

    Apr 2023 – Oct 2024

    1. Freelance Web Developer

      Apr 2023 – Oct 2024 · Remote

      • Built web apps, software and mobile apps for clients with JavaScript technologies.
      • AMORC — mobile app for Instituição Rosacruz, a Brazilian community that runs an Egyptian museum in Curitiba, where members share their work, contribute to the community, organize events and log day-to-day errands. Built mainly with React Native.
      • Inversion — front end of an app to organize finances and manage investments, earnings, wallet and projections (Vue.js front end, Java back end).
      • SplitWave — website for a seismic anisotropy specialist, where students upload their records of seismic events and browse other records. Built with Astro, Vue.js, AWS RDS and Vercel.
    TypeScript JavaScript React React Native Next.js Vue.js HTML CSS AWS Google Cloud

  3. Mirene Confecções

    Oct 2022 – Mar 2023

    1. Junior Full Stack Developer

      Oct 2022 – Mar 2023 · Remote

      • Built the company's institutional website and an ERP covering financial operations, customer data, product catalog and quote generation.
    Astro Tailwind CSS Vue.js Bun Hono Cloud Run Docker Vercel TypeScript

  4. JVM Webmarketing

    Apr 2022 – Aug 2022

    1. Junior Front-end Developer

      Apr 2022 – Aug 2022 · Remote

      • Built responsive websites with React and Next.js for a marketing startup's client portfolio.
    React Next.js

Selected work

Case studies from production

Production systems I built at Groner. The code is proprietary, so these are architecture write-ups — no source code or client data.

Other projects

Client work and side projects with live links.

All projects & archive

Toolbox

Skills, education & languages

Languages
TypeScript JavaScript C# SQL Python Java HTML CSS
Front-end
Vue.js React React Native Next.js Astro Quasar Tailwind CSS
Back-end & data
Node.js Bun Express Hono .NET Entity Framework SQL Server DynamoDB
Cloud & DevOps
AWS Lambda ECS SQS SES S3 CloudFront Amplify Google Cloud Google Maps API Google Calendar API Docker
Tools
Git GitHub GitLab Vite Jest Figma n8n

Education

  • Technologist degree in Systems Analysis and Development

    Pontifical Catholic University of Paraná (PUCPR)

    2024 – 2026 In progress · expected 2026

Spoken languages

Portuguese
Native
English
Advanced

Contact

Let’s build something together

I’m open to international opportunities. The quickest way to reach me is email.

gustavodelferreira.12@gmail.com
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