User registration 40% faster
Problem
The system made two synchronous calls to an external service, forcing users to wait between registration steps. The experience caused abandonment and frustration.
Solution
We redesigned the flow using an event-driven architecture in the backend microservices. Users continue filling in information while the system processes in parallel, with automatic retries and DLQ as backup.
Result
40% reduction in registration time. The product team went from seeing the consultant as an external vendor to treating them as a strategic ally.
From 1,000 to 200 million users
Problem
A gamification product started as an experiment with 1,000 users and a simple architecture. It needed to scale massively without losing flexibility.
Solution
We designed an architecture based on the concept of "islands": independent modules with low coupling that allowed new teams to extend functionality without touching the core.
Result
Scaled to 200M users per challenge, 12 game types, 10+ products, 6+ reward types. Developer turnover was practically zero.
3 critical vulnerabilities detected in time
Problem
The MFA implementation for transactional services of a neobank had security flaws that no one had detected.
Solution
We identified 3 issues: unencrypted content, no integrity validation, and duplicated code across services. We proposed encryption, pre-generated key validation, and a reusable decorator pattern.
Result
The client's architecture committee acknowledged that the review prevented production incidents with potential for significant financial losses.
From 55% to 85% compliance across 900+ developers
Problem
A software engineering excellence program had 55% compliance across 44 metrics, with over 900 developers who didn't know which metrics applied to them.
Solution
We implemented an ambassador model, personalized sessions, chapter academy, internal publications, and continuous technical coaching.
Result
In 8 months, compliance rose to 85%. An organizational directive was proposed requiring 90%+ as a prerequisite for production deployment.
Automated migration from 18 to 6 days
Problem
Hundreds of repositories needed to migrate from Spring Boot with Java 17 to Quarkus with Java 21. Each manual migration took 18 days.
Solution
We automated the process using the agent mode of an AI assistant with custom instructions and Open Rewriter recipes for base configurations.
Result
Migration time was reduced from 18 to 6 days per repository. An organizational agent is being proposed so any team can use it.
mTLS configuration that unblocked 4 banks
Problem
No one wanted to take on the task of configuring mTLS in the backend microservices to connect with the banking core ESB. Not even the architects.
Solution
We took the initiative and researched for 20 days, testing different solutions while others gave up after a couple of days.
Result
We found the solution just before the organization hired external specialists. This unblocked 4 banking entities for production launch.
Team assembled in 4 months when they said it would take 10
Problem
6 developers needed to be hired and the estimate was 10 months. They couldn't wait that long.
Solution
We designed adaptive interviews where we taught candidates during the conversation, sparking curiosity and evaluating honesty. We created a safe environment from the first contact.
Result
The team was assembled in 4 months. 2 of the 6 developers became area references. Other leaders joined interviews to learn the strategies.
Firm security stance that prevented data exposure
Problem
An external team offered a quick WhatsApp integration without following standard security practices. All stakeholders were aligned to ship it fast.
Solution
We firmly opposed, demonstrated the vulnerabilities, worked with the security department, and implemented channel authentication, partial encryption, and key rotation.
Result
Shortly after, another area of the company suffered a security breach where attackers extracted over 10,000 repositories. Our channel remained protected thanks to the measures we implemented. Colleagues thanked the firm stance.
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