We turn complex ideas into high-performance software. Cutting-edge technology for companies that aim for market leadership.
Loading Complex Problems
We turn complex ideas into high-performance software. Cutting-edge technology for companies that aim for market leadership.
History
Founded in 2017 by Guilherme Mello, 300 Software is a team of senior professionals solving the problems that matter. 18 years of experience. EMBA from IESE. And a philosophy: complexity deserves real engineering.
"Guilherme and Mario brought both technical depth and professionalism to the organization, and I would confidently recommend them for environments that value reliability, collaboration, and strong delivery outcomes." — Scrum Master, Frontier Airlines
Build the most reliable, thoughtfully engineered software solutions for the problems that matter—where artificial intelligence accelerates our work but human judgment leads the way.
We don't do commodity solutions or generic products. We solve the high-stakes problems—fintech platforms, logistics networks, B2B infrastructure—where failure is expensive and complexity is real.
AI is an accelerator. But we deliver with architectural judgment, careful testing, and accountability. Your system runs on our reputation, not luck.
We optimize for sustainable complexity. Your code should be maintainable. Your architecture should scale. Your team should understand it. That's what engineering is.
Fast doesn't mean reckless. We move decisively because we're experienced, focused, and uncluttered. You ship results in weeks, not quarters.
We're not here for billable hours. We're optimizing for your business outcome. Better architecture. Fewer bugs. Systems that last. That's our measure.
Many clients we started with years ago are still growing with us. We're built for lasting relationships where we learn your domain, you trust our judgment, and we grow together.
Our values aren't marketing. They're how we operate every day.
We don't cut corners, don't oversell, and don't ship code we're not proud of. Your system's reliability is our reputation.
You'll get our real assessment—what's broken, what's working, what's risky. We don't tell you what you want to hear.
No black boxes. Architecture explained. Trade-offs articulated. Progress visible. You should understand what we're building and why.
We optimize for your business results, not our billable time. Better solutions often take fewer hours. We want you to win.
Technical competence, ownership, accountability. That's who we are.
We'll recommend what's best for you in 2 years, not what's fastest today. Sustainable complexity. Systems that last.
Plans don't matter if you don't ship. We're obsessed with moving fast while keeping quality high. Speed with substance.
Working with both Guilherme and Mario as part of the same development team—they were pillars. They consistently demonstrated technical competence, ownership, and accountability in delivering commitments.
Senior professionals with deep experience in fintech, logistics, and complex B2B systems. The kind of team that solves hard problems.
View full team
Founder & Chief Executive Officer
Chief Financial Officer
EverChain has enjoyed a successful partnership with 300 Software since 2020, focused on implementing new software products and ongoing maintenance. The team is highly productive and internal stakeholders have been particularly impressed with their knowledge, efficiency and experience.
Our experience with the system developed by 300 Software has been very good. The system is very reliable and intuitive, greatly assisting in the team's adoption and adaptation. It met our needs as we expected and post-implementation support has been excellent.
COMMON QUESTIONS
We optimize for complexity and outcomes. No commodity solutions. No fresh grads. No AI-first shops shipping untested code. We're experienced senior engineers solving real problems with AI as acceleration but engineering judgment as the product.
Mission-critical systems with real complexity: fintech platforms, logistics networks, B2B infrastructure, marketplace systems, platform modernization. We take on the problems others shy away from. If your project is straightforward, cheaper vendors will do fine.
Guilherme (founder) has 18 years of engineering experience, EMBA from IESE. The team averages 15+ years. We've built, debugged, and scaled real systems through boom and bust. We know what works.
Headquartered in Belo Horizonte, Brazil. We work with clients globally—US, Europe, LatAm. Time zones? We figure it out. You get senior engineers who speak your language and understand global business.
