Wellyson Freitas
Software Engineer
Barcelona, Spain
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Senior Software Engineer specialized in software architecture and cloud-native, data-intensive systems within regulated financial environments.
Experience across European digital banks and Brazilian financial institutions, building and operating large-scale platforms for fraud prevention, anti-money laundering (AML), and financial risk monitoring.
Focused on event-driven architectures, real-time data processing, and integration with third-party risk platforms and government infrastructures.
Technical strengths include system reliability, interoperability across heterogeneous platforms, and applied machine learning for anomaly detection.
MBA in Data Science and Analytics (University of São Paulo) and postgraduate degree in Software Architecture. Strong combination of hands-on engineering, architectural thinking, and data-driven decision-making.
Originally from Brazil, based in Barcelona.
Area of Expertise
Topics
Reliable Systems Beyond Your Control
Modern systems rely on services, vendors, and integrations that teams do not control. Reliability issues usually appear at these boundaries, where visibility is limited, ownership is shared, and assumptions fail.
This talk is based on real experience with fintech systems handling compliance workflows and third-party integrations. Failures rarely stay within a single component. They cross systems, teams, and responsibilities.
We will look at how to design safer boundaries, operate with incomplete information, and handle incidents when parts of the system behave like black boxes. It also touches on the coordination required between teams and vendors to keep systems running.
The focus is practical: how to keep systems reliable when control is partial and constraints are not negotiable.
The Hardest Part of Software Isn't the Code
Software engineering is often treated as a technical problem. In real systems, many of the hardest challenges are not technical at all.
In integration-heavy environments, complexity comes from ownership, alignment, and decisions made under constraints. This shows up before writing code, while building, and long after systems are in production.
Systems move across teams, responsibilities become unclear, and progress depends on coordination more than implementation.
At the same time, writing code and producing documentation is getting easier. The bottleneck is shifting. Building is faster, but deciding what to build and aligning people around it remains difficult.
This talk looks at how systems become hard to understand, why technically correct solutions are not always the ones shipped, and how knowledge ends up concentrated in a few people.
It is a reflection on software engineering in practice, where understanding and alignment matter as much as code.
SREday Barcelona 2026 Q2 Upcoming
Global series of conferences and meetups in Europe, NA and Asia. Join the leading community of SREs, Cloud and DevOps engineers. Learn from experts. Network with fellow nerds.
Software Crafters Barcelona Talks Upcoming
Software Crafters Barcelona is a community which aim to attract and connect software development professionals who feel passionate about their work and share the values and principles of the Crafters movement.
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