Blockchain Developer; Java)

US, remotely

• Implement and operationalize core backend services with fault tolerance, security, and scalability.
• Build API-first services integrating blockchain networks, third-party provider solutions, and internal systems with strong consistency guarantees.
• Implement secure service communications using cryptographic signatures, key management, and zero-trust architecture principles.
• Operationalize event-driven systems using Apache Kafka and asynchronous messaging patterns.
• Build highly available, strongly consistent, horizontally scalable services.
• Implement robust concurrent and asynchronous processing patterns for multi-threaded workloads.
• Integrate Web3 SDKs and libraries for on-chain interactions, transaction signing, and state monitoring.
• Implement structured logging, distributed tracing, metrics, and Open Telemetry instrumentation.
• Produce and maintain high test coverage via automated unit, integration, and functional testing frameworks within CI/CD pipelines.
• Produce and maintain technical documentation, API specifications, and operational runbooks.

• 7 or more years of software engineering experience building and operating production-grade backend systems in regulated financial or enterprise environments.
• Experience with blockchain networks, smart contracts, consensus mechanisms, crypto integration, or tokenization platforms.
• Extensive hands-on proficiency in Java and Spring Boot. Comfort operating across polyglot stacks.
• Deep expertise in API-first design, RESTful service contracts, and microservices architecture patterns.
• Strong command of concurrent, multi-threaded, and asynchronous programming models.
• Proven track record delivering highly available, strongly consistent, and distributed applications.
• Hands-on experience building event-driven solutions using Apache Kafka.
• Strong understanding of CI/CD, Dev Sec Ops  practices, secure SDLC, and automated security controls.
• Hands-on experience with Open Telemetry, distributed tracing, and observability platforms.
• Strong technical writing skills; demonstrated ability to produce API specs and runbooks.
• Proven experience using Web3 libraries and SDKs (Web
  3.js, Ethers.js, or equivalent).

• Extensive hands-on proficiency in Type Script, Node.js, and/or NestJS.
• Direct experience with Ethereum, Bitcoin, Solana, XRPL, and other distributed ledger technologies.

• Familiarity with MPC (Multi-Party Computation), HSMs, and enterprise key management systems.
• Experience implementing Zero Trust security architecture end-to-end.
• Knowledge of tokenization, stable coins, settlement systems, and digital asset operations.
• Contributions to open-source blockchain projects or Web3 tooling.

• Global client interaction in a dynamic company serving the market for 15+ years with offices in Miami, Antwerp, Leuven, Lisbon, Viseu, Kyiv, Krakow, and New York.
• Passionate team in an innovative casual, positive, and open work environment ready to meet your new ideas.
• Great opportunities for personal and professional development as well as the chance to change the way the business works in the financial world.

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Originally posted on Himalayas