Diego López León
Core Blockchain Developer at ETC Cooperative
Vicente López, Buenos Aires, Argentina
Summary
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RockstarDiego López León is a Core Blockchain Developer with 17 years of software engineering experience, currently contributing to ETC Cooperative from Buenos Aires. He blends deep Java backend expertise with blockchain protocol work, having held core developer roles at RSK Labs and contributed to enterprise-grade clients like Hyperledger Besu. Diego is an active open-source contributor focused on persistence, transaction handling and robustness—his commits touch well-known projects such as Drools/Kogito and Besu where he improved logging, error handling and testing infrastructure. His background includes applied blockchain advisory work at the Inter-American Development Bank, showing he can translate technical protocol details into practical, policy-relevant solutions. Known for careful refactors and improving test coverage, he brings a quality-first approach to complex distributed systems. Colleagues rely on him for pragmatic fixes that reduce operational surprises in production blockchain and business-automation platforms.
17 years of coding experience
11 years of employment as a software developer
English, Spanish
Github Skills (25)
transaction10
spring10
jbpm10
testing10
command-line-interface10
drools10
java10
rule-engine10
javas10
transactionscope10
persistence10
exception-handling10
ethereum10
blockchain10
transaction-manager10
Programming languages (21)
Github contributions (5)
rsksmart/rskj
Feb 2018 - Nov 2019
RSKj is a Java implementation of the Rootstock protocol.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:153 commits, 236 PRs, 591 pushes in 1 year 9 months
Contributions summary:Diego primarily focused on refactoring and improving the testing infrastructure of the RSKj project. This included modifying and removing existing test cases within `NodeBlockProcessorTest.java`, as well as updating the test environment by moving and refactoring `RskContextTest.java` and related classes. The changes involved reorganizing data sources and dependencies, as well as cleaning up code to eliminate unused libraries and increase testing coverage.
rskjavarskj
hyperledger/besu
Sep 2021 - Dec 2022
An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
Role in this project:Back-end Developer
Back-end DeveloperContributions:109 reviews, 35 commits, 55 PRs in 1 year 3 months
Contributions summary:Diego primarily contributed to the Besu Ethereum client, focusing on enhancements related to core protocol specifications and command-line interface functionalities. Their work involved setting gas calculators, adding options for private key files, and incorporating support for custom private key files within public-key subcommands. Additionally, the user improved functionality by adding discovery options to the genesis file and incorporating improvements for handling potential errors.
besuhyperledgerlicensedethereump2p
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