Job Description

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:

  • Core blockchain client development
  • EVM compatibility at the protocol level
  • Consensus, execution, and performance improvements
  • Backend, low-level engineering in Java

    • 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, certifications, and language courses.
  • Opportunity to work on mission-critical blockchain infrastructure with global impact.
  • Monthly allowance for contractors to support connectivity and well-being.

    • Apply for this Position

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