Senior Software Engineer (Java)

ABOUT THE ROLE

We are looking for a curious and collaborative Senior Software Engineer based in Europe or Latin America to join Rootstock Labs during an exciting time of growth.

You will be part of the core development team behind the Rootstock (RSK) client. The team is evolving its compatibility with the EVM, contributing to consensus improvements, and designing secure, high-performance protocol features.

You’ll work closely with experienced blockchain engineers in a fast-paced environment to push the boundaries of web3 infrastructure. This is a hands-on engineering role focused on Java-based development, with occasional Solidity scripting for testing purposes.

KEY RESPONSIBILITIES

• All features will be developed using Java, the primary language of the Rootstock client.
• Analyze complex requirements to improve the Rootstock client. This may include Ethereum consensus changes, Bitcoin scripts, or internal research papers.
• Design and implement features using Java, adhering to secure, scalable, and performance-conscious best practices.
• Write clean, modular, and well-tested code using appropriate design patterns.
• Collaborate on peer reviews and team discussions; continuously improve development processes and code quality.
• Write simple Smart Contracts to validate the features developed in our client, assuring that it works as it is in EVM.
• Share research findings and technical insights with global peers across the company.
• Update and expand our Github actions scripts from our pipelines.

WHAT YOU BRING

• 5+ years of professional experience in Java, or equivalent experience with JVM-based languages (Kotlin, Scala, Gradle) or C++.
• Solid experience working on core blockchain components (e.g., node/client development) — ideally in chains that support Ethereum or Bitcoin L2s.
• Understanding of Ethereum or Bitcoin architecture, smart contract execution, and consensus mechanisms.
• Ability to reason about security, performance, and edge cases in complex distributed systems.
• Proficiency in writing clean, maintainable code and applying object-oriented programming principles.
• Strong grasp of data structures (e.g., trees, graphs) and their practical use in system design.
• Experience with basic Solidity scripting and knowledge of how to interact with smart contracts.
• Familiarity with CI/CD pipelines and scripting automation (e.g., GitHub Actions).
• Excellent team player — you take ownership, communicate clearly, and enjoy collaboration.
• Proactive about quality, security, and documentation.
• Fluent in English (written and spoken).

ROOTIES BENEFITS

At RootstockLabs, we don’t just offer a job, we offer a community. Here’s what you can expect when you join us:

• Competitive compensation package and unique benefits designed to support your growth and well-being.
• 100% Remote Work from Europe / Latin America, with access to global CoWorking spaces.
• Work-Life Balance: Up to 35 vacation days, 30 sick days and parental leave.
• Continuous Learning: Access to training programs, language courses, and learning sponsorship annually.
• Unique Projects: Work with cutting-edge blockchain technology in a global, diverse team.
• Monthly Allowance for Contractors to support your connectivity and well-being.

ABOUT ROOTSTOCKLABS

RootstockLabs exists to make Bitcoin work for everyone. We do this through giving developers the tools to build on Bitcoin, supporting the growth of the Rootstock ecosystem and the RIF economy while continuing to expand the frontiers of decentralized technology.

Our Purpose: To Make Bitcoin work for everyone

Our Mission: Give developers the tools to build on Bitcoin, support the growth of the Rootstock ecosystem, and expand the frontiers of decentralized technology.