The skills that won't deprecate in the AI era
While you debate whether AI "truly thinks", the market is already redefining what it expects from you. Stop debating AGI and start investing in the right skills.
Read articleAI Native · Product Builder · Software Engineer
I'm Marcelo Santos, an AI Native Engineer and Product Builder with 20+ years in software. I lead agents and help teams take products from discovery to production.

02 / About
I create skills, agents and loops that build products, not just code.
I turn product requirements into specifications and reusable skills for agents. Those skills capture the context, constraints, and checks the work needs.
I combine automated code review with evals for real product tasks. I check outcomes across repeated runs and turn failures into regression cases.
I stay responsible for architecture decisions and what reaches production. I work with Product and Design to check that the result solves the intended problem.
I turn product knowledge and engineering practices into instructions agents can reuse.
I connect planning, implementation, and review into repeatable workflows.
I review changes for correctness and maintainability. I use evals to check task completion and the resulting product behavior.
I stay involved from product discovery through delivery and production.
03 / Experience
SINCE MARCH 2026
Playlist · ClassPass Engineering Council
I work with Product and Design on services and APIs built with Kotlin, React, PostgreSQL, and AWS. I also contribute to engineering decisions through the ClassPass Engineering Council.
PREVIOUSLY
will bank
I developed Will Pay in Flutter and led cross-functional teams. My work included technical strategy, Datadog observability, and DORA metrics.
ACROSS MY CAREER
Catalisa · Banco BV · Minespider
I co-founded Catalisa and built its platform. At Banco BV, I led event-driven architecture work. At Minespider, I implemented a protocol for mineral traceability.
Full Cycle
In progress · Expected December 2026Uniamérica
2021 to 2025I write about distributed systems and AI-assisted development on marcelsud.me.
Read my articles04 / Selected work
Will Pay lets people accept NFC tap-to-pay, payment links, and Pix on a smartphone.
I developed the mobile app as a Principal Software Engineer and led cross-functional teams. My work included technical strategy, Datadog observability, and DORA metrics.
I co-founded Catalisa and architected the platform. We launched it in three months.
I defined engineering practices and reusable components, and designed authentication with OAuth 2.0 and JWT.
I led event-driven architecture work through Panoptes. For Kronos, I designed more than 30 reusable business capabilities for credit products.
As a Principal Engineer, I coordinated engineering, infrastructure, data, and security teams. I trained engineers in Apache Kafka and designed reusable capabilities for credit products.
I implemented a mineral-traceability protocol based on its whitepaper. The work included Ethereum smart contracts and integrations with industry partners.
As a Staff Software Engineer, I developed Ethereum smart contracts and worked on integrations with validators, universities, and industry partners in Europe.
05 / Blog
The three latest posts from my English blog.
While you debate whether AI "truly thinks", the market is already redefining what it expects from you. Stop debating AGI and start investing in the right skills.
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Read article06 / Let's talk
Find me on LinkedIn to discuss engineering, product development, or speaking opportunities.