JAVA Software Engineer Expert (Blockchain) (Ciudad de México)

Link-Worldwide (Distrito Federal, México) Seguir Publicado hace 1 día

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

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

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 general 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.

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