Location: Remote
Work Modality: 100% Remote (Europe & Latin America)
About the Opportunity
At 5411 Hub, a headhunting firm specialized in senior and expert‑level technology roles across LATAM, the U.S., and Europe, we are partnering with a leading global company in blockchain infrastructure and decentralized technologies to recruit a Software Engineer Expert.
This is a core engineering role, focused on the evolution of a blockchain client (node/client software) that supports EVM compatibility, consensus improvements, and secure, high‑performance protocol features.
The Role (explained clearly)
This is not a typical Web3 application or dApp development role.
It is a deep engineering position, centered on:
* EVM compatibility at the protocol level
* Consensus, execution, and performance improvements
You will work alongside highly experienced blockchain engineers in a fast‑paced, research‑driven environment, building Web3 infrastructure at the foundation level, where architectural and implementation decisions directly impact network security, stability, and scalability.
Key Responsibilities
* Develop new features for the blockchain client using Java as the primary language.
* Analyze complex technical requirements, which may include: Ethereum consensus changes Bitcoin scripts Internal research papers and protocol proposals
* Design and implement features following best practices for security, scalability, and performance.
* Write clean, modular, well‑tested code using solid object‑oriented design principles.
* Actively participate in peer reviews and technical discussions to continuously improve code quality and development processes.
* Write simple Solidity smart contracts to validate and test client features at the EVM level (testing purposes only, not production dApp development).
* Share research outcomes and technical insights with distributed, global teams.
* Maintain and expand CI/CD automation, including GitHub Actions pipelines.
What You Bring (and what it really means) Strong Technical Background
* 5+ years of professional experience in Java, or equivalent experience with JVM‑based languages (Kotlin, Scala, Gradle) or C++.
* 3+ years of experience working on core blockchain components, such as: Node or client development Consensus or execution layers Protocol‑level infrastructure
* Solid understanding of Ethereum or Bitcoin architecture, including: Smart contract execution models Consensus mechanisms Core protocol design
* Ability to reason deeply about security, performance, and edge cases in complex distributed systems.
* Strong command of data structures (trees, graphs, etc.) and their practical application in system design.
* Basic experience with Solidity, with a clear understanding of how to interact with smart contracts (primarily for testing and validation).
* Familiarity with CI/CD pipelines and automation tools such as GitHub Actions.
👉 When the role refers to “core blockchain components”, it means critical infrastructure, not surface‑level application development.
Professional Profile & Collaboration
* Hands‑on engineer with strong ownership and accountability.
* Clear technical communicator and collaborative team player.
* High standards for code quality, security, and documentation.
* Comfortable working in a fully remote, global, and diverse environment.
* Fluent English (spoken and written) is required.
What’s Offered
* Competitive compensation aligned with expert‑level seniority.
* 100% remote work from Europe or Latin America.
* Access to global coworking spaces.
* Strong work–life balance, including generous vacation, sick leave, and parental leave policies.
* Annual learning budget for training, certificates, and language courses.
* Opportunity to work on mission‑critical blockchain infrastructure with global impact.
* Monthly allowance for contractors to support connectivity and well‑being.
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