Shout out to Carlos Grahl and Tiago Emil
Shout out to Andre Poffo
Software and hardware engineer, 12+ years building web apps. Mostly React and Node.js, currently learning Rust and HTMX. On the side I tinker with networking, computer graphics, 3D printing, and microcontrollers.
LinkedIn | Github | E-mail | Schedule time with me
| 2021 – | |
Building web apps for startups and larger companies. More on my Toptal profile. |
| 2020 – | |
Started my own company to take on custom projects under proper contracts. |
| 2020 – 2021 | |
Full-stack web development. Worked with clients from the first conversation to a shipped product — figuring out what they needed, planning it, and building it. |
| 2020 – 2020 | |
Built web apps from scratch, full-stack. Cleaned up legacy code and reworked the APIs to be more consistent. |
| 2019 – 2020 | |
Built a tool to migrate data from the old monolithic database to a new
cloud one, and moved features from the legacy software into the new
cloud ERP. Built a tax calculation engine that stayed fast even with
large, complex inputs.
Shout out to Carlos Grahl and Tiago Emil |
| 2015 – 2018 | |
Built the corporate tax module from scratch. Rewrote the tax
calculation so it ran much faster than the old system, and wrote a
tool to migrate data from the legacy software.
Shout out to Andre Poffo |
| 2014 – 2015 |
|
Worked on the revenue module of city government software — property and land tax calculations, plus collections. Integrated third-party systems for generating reports. |
Jonathan Feller — 2026