
Backend Developer
One of his proudest achievements is developing the Rust Arweave SDK, a foundational component of a larger infrastructure project. This SDK has been adopted by thousands of developers worldwide, demonstrating Gustavo's ability to deliver scalable, high-impact solutions.
With a blend of technical expertise and a user-focused approach, Gustavo ensures the delivery of well-rounded, high-quality software. His thoughtful decision-making, especially when considering user experience, makes him an invaluable contributor to any project.
Adapted to a fast-paced startup environment by proactively addressing challenges, exploring new technologies, and contributing to the startup's overall success;
Developed and maintained parts of the protocol and its blockchain-based applications using Solidity, TypeScript, Postgres, and Rust, with the core protocol consensus mechanism deployed on Solana;
Built backend systems and SDKs to support blockchain-based applications, leveraging Rust to ensure seamless integration with front-end interfaces and external services, resulting in an SDK with over 100 downloads on crates.io;
Collaborated with cross-functional teams, including blockchain developers, product managers, and designers, to architect and implement scalable and secure Web3 solutions, successfully releasing a new core component of the protocol.


Conducted over 30 technical interviews for software engineering candidates as a freelance interviewer within a 3-month period;
Assessed candidates' programming proficiency in languages such as Java, Python, and C++, based on specific job requirements;
Maintained a professional and objective approach during interviews, adhering to ethical guidelines to ensure fairness and transparency in the assessment process.
Joined a reputable consulting firm as a Software Engineer, specializing in traditional software development methodologies and contributing to the development of a test automation platform suite;
Developed and maintained software applications using established programming languages, frameworks, and technologies, including Java, Kotlin, Spring Boot, and Azure DevOps;
Adapted to client-specific software development processes and methodologies, aligning with the consulting firm's standards to ensure successful project outcomes;
Contributed to the project’s integration into the firm’s consulting services, resulting in a 20% increase in overall revenue.

Co-founded an insurance-tech startup, securing angel funding to support business operations and growth;
Developed the initial business concept by conducting market research and identifying opportunities in the insurance technology sector, successfully raising 150k BRL in angel investment;
Assembled and managed a talented team, recruiting professionals with expertise in insurance, technology, and business development, increasing the team size by two software engineers;
Established strategic partnerships with insurance companies, brokers, and other relevant stakeholders, expanding the startup's network and customer base;
Achieved recognition by being selected for a mentorship program from São Paulo's town hall and the Google Campus Startup Zone Pilot program.

Collaborated with senior software engineers and team members to design and implement software components and features;
Assisted in the development and maintenance of surveillance software applications, incorporating key functionalities such as video capture, storage, retrieval, and analytics;
Contributed to the surveillance tool’s capability to gather 30 GB of biometric data daily;
Integrated software with hardware devices, including cameras, sensors, and access control systems, ensuring seamless communication and data exchange;
Deployed the project across multiple shopping malls and hospitals in the Rio de Janeiro metropolitan area, contributing to a 30% increase in company revenue.
All Backend Developers who have applied to Proxify are scored from 0 to 300 on engineering excellence, one of the five parameters we evaluate. This score reflects engineering excellence only, based on interviews, take-home assignments, live coding sessions, and/or on-the-job performance reviews. The curve shows how all evaluated Backend Developers are distributed across that range, where our acceptance threshold for this parameter sits, and where Gustavo stands.


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