Gustavo Martín
Blockchain Smart Contracts & Backend Developer
Salary / Daily rate
Toledo, Spain
Freelance
Remote only
Skills
Languages
About me
Intro
Blockchain Smart Contracts & Backend Developer with 3+ years building DeFi protocols on EVM. Led development teams at Dexynth, created custom oracles, and institutional integrations at fija Finance. Specialized in Solidity smart contracts, TypeScript/NestJS backends, delivering secure solutions for CEXs, DEXs, and financial institutions.
Work experience
Customer Integration Engineer
fija FinanceFreelance
Mar 2025 - Present
1 year 8 months
Design and implementation of customized solutions for the integration of fija’s DeFi strategies based on ERC-4626 vaults into institutional clients’ systems and workflows, serving CEXs, DEXs, banks, venture capital firms, and other financial institutions, as well as backend development using Node.js and NestJS, including the creation of market-making bots, automation tools, and various backend services that support integrations and internal operations.
Blockchain Developer
Dexynth - Multichain Synthetics Trading Protocol
Jan 2023 - Oct 2024
1 year 10 months
Designing, developing, optimizing, and updating smart contracts for the protocol, ensuring efficiency and security. Creating custom oracles from scratch, adaptable to emerging networks where no other oracle solutions are available. Developing API services and backend microservices essential for the successful operation of a complex protocol. Implementing and adapting the protocol on various Layer 2 Ethereum Virtual Machine (EVM) networks, improving scalability and performance. Planning, coding, and monitoring improvements in smart contracts and associated services, ensuring the protocol's ongoing evolution. Leading the development team, fostering a collaborative environment aligned with project goals.
Blockchain Developer
BeGlobal Finance
Jul 2022 - Dec 2022
6 months
Deployment, review and testing of BeGlobal's lending/borrowing protocol. Chainlink Keepers for settlement automation. Various smart contracts for protocol reinforcement and optimization.
PLC and SCADA software developer for Cooling and Ventilation Controls.
CERN
Jul 2019 - Jul 2022
3 years 1 month
Geneva 23, Canton of Geneva, Switzerland
Develop PLC applications for Cooling and Ventilation Controls at BE-ICS-CE.
Student
Industrial Automation and Robotics at IES Juan Antonio Castro
Sep 2017 - Jul 2019
1 year 11 months
45600 Talavera de la Reina, Toledo, Spain
I.E.S. Juan Antonio Castro
Technical Director
Localización y Control de Flotas (LCF)
May 2010 - Jul 2019
9 years 3 months
45600 Talavera de la Reina, Toledo, Spain
Location, monitoring and remote security for vehicles and machinery. Technical director of programming, integration and R&D.
Manager
ForjaEconomica.com
Jun 2008 - Jul 2019
11 years 2 months
45662 Alcaudete de la Jara, Toledo, Spain
Forged iron furniture online shop. Commercial director and web development.
Blacksmith Forger
Nono Martín Forged Iron Furniture
Jun 1998 - Jan 2008
9 years 8 months
45662 Alcaudete de la Jara, Toledo, Spain
Manufacture of artistic forged furniture.
Education
Cyfrin Updraft
Smart Contract Security
2025 - Present
1 year 10 months
Udemy
Go - The Complete Guide
2025 - 2025
2 months
DevTalles
Nest: Scalable Backend Development with Node
2025 - 2025
4 months
RareSkills
60 days of Solana
2024 - 2024
4 months
Alchemy University
Javascript Fundamentals
2022 - 2022
1 month
freeCodeCamp
Learn Blockchain, Solidity, and Full Stack Web3 Development with JavaScript – 32-Hour Course
2022 - 2022
3 months
Udemy
Web3 & Blockchain developer
2022 - 2022
3 months
IES Juan Antonio Castro
Certificate of Higher Education (Level 5)
2017 - 2019
3 years