Open to opportunities

Renato Valim

@renatovalim

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Full-stack software engineer specializing in Elixir, blockchain wallets, and scalable financial systems.

Estonia

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What I'm looking for

I seek backend or full-stack roles focused on fintech/crypto, security-conscious teams, scalable systems, and opportunities to drive product and compliance impact.

I am a full-stack software engineer with six years of experience building scalable, high-performance systems for fintech and crypto platforms. I specialize in Elixir and JavaScript, and I have delivered core ledger systems, KYC compliance layers, and multi-chain blockchain wallets.

At Yolo I implemented proactive monitoring to detect suspicious crypto transactions, strengthened payment integrations with end-to-end encryption, and helped replace legacy Bitcoin and Solana wallet implementations in production. At Mono and Swap I contributed to ledger and fee systems that directly impacted revenue and to compliance and security efforts that supported licensing pathways.

I bring a pragmatic, security-first engineering approach, strong experience with Phoenix/LiveView, Ecto, Postgres, Docker, Kubernetes and AWS, and a track record of shipping production systems that improve reliability, compliance, and business outcomes.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

Yolo

Mar 2025 - Present (7 months)

Built security-focused systems for crypto platforms, including fraud monitoring and end-to-end encryption. Developed new Bitcoin and Solana wallets that replaced legacy implementations, and delivered features across multiple chains (Ethereum, Tron, Ton, etc.).

Elixir Phoenix Bitcoin Solana Cryptography Docker Kubernetes Postgres

Software Engineer

Mono

May 2022 - Mar 2025 (2 years 10 months)

Contributed to the design and implementation of a core ledger system for a card transaction platform and developed a complex fee system that improved customer engagement and increased revenue.

Elixir Ecto Ledger Design Financial Systems Fee Engines Postgres Docker AWS

Software Engineer

Swap

Aug 2021 - May 2022 (9 months)

Built the KYC layer for a banking-as-a-service platform, implemented compliance features enabling licensing progress in Brazil, and contributed to an OWASP security analysis that influenced product decisions.

Elixir KYC & Compliance Security Analysis OWASP Postgres API Design Testing

Software Engineer

VILT Group

Dec 2019 - Aug 2021 (1 year 8 months)

Developed and maintained enterprise applications using Java and the Spring ecosystem; designed an OCR system that automated bank slip processing and increased transaction volume by 50% for a major client.

Java Spring OpenText Enterprise Integration Postgres Docker Automation)Automation

Software Engineer Intern

FIEC

Jun 2019 - Dec 2019 (6 months)

Designed an accessibility application enabling visually impaired users to request public transport (thousands daily) and refactored a turnstile system to improve observability and performance.