IO Tech Solutions Limited
Backend Engineer - Java (Crypto)
Backend engineer building and maintaining core Java services and APIs for a crypto custody and asset-management platform, integrating internal and external services in a distributed system. Day-to-day involves microservices, REST APIs, messaging (Kafka), observability, testing, and reliability work.
- Compensation
- Not disclosed
- Location
- Hong Kong
- Work setup
- Remote
- Seniority
- Not specified
- Employment
- Not specified
- Experience
- 4+ years
- Category
- Backend
- Posted
Skills
Must have
- 4+ years of software engineering experience delivering production-grade systems in high-stakes or regulated environments
- Expert-level proficiency in Java and familiarity with JDK internals
- Hands-on experience with microservice architectures, RESTful APIs, and messaging systems (e.g., Kafka)
- Strong systems-design skills with a security-first mentality and experience building production-supported fault-tolerant systems
- Solid testing mindset — unit, integration, and end-to-end testing strategies and automation
- Clear communicator with technical and non-technical stakeholders across distributed teams
- Sense of ownership and willingness to drive features end-to-end
Nice to have
- Experience with digital assets, blockchain protocols, custody solutions, or traditional financial services
- Familiarity with application/network security best practices and secure coding patterns
- Experience using AI tooling to accelerate development workflows
- Experience with cloud providers, especially Google Cloud Platform (GCP)
- Front-end experience with React
Full description
What you'll do
- Design, build, and maintain core Java services and APIs that power custody and asset-management workflows with emphasis on correctness, availability, scalability, and performance.
- Integrate internal modules and external services into a unified platform while maintaining data integrity and reliable inter-service communication.
- Produce clean, well-documented, testable code and set quality standards through code reviews and engineering best practices.
- Troubleshoot and resolve issues in distributed systems using observability tooling (health checks, metrics, tracing, logging) to identify and eliminate bottlenecks.
- Collaborate with product managers, designers, security, and other engineering teams to translate product requirements into secure, maintainable technical designs.
- Contribute to reliability and incident-response processes, including post-incident analysis and remediation.
What you'll bring
- 4+ years of software engineering experience delivering production-grade systems in high-stakes or regulated environments.
- Expert-level proficiency in Java and familiarity with the JDK internals.
- Hands-on experience with microservice architectures, RESTful APIs, and messaging systems (e.g., Kafka).
- Strong systems-design skills with a security-first mentality and proven experience building fault-tolerant systems that are supported in production.
- Solid testing mindset — unit, integration, and end-to-end testing strategies and automation.
- Clear communicator who can explain technical concepts to both technical and non-technical stakeholders across distributed teams.
- A sense of ownership and willingness to drive features end-to-end.
Nice to have
- Experience with digital assets, blockchain protocols, custody solutions, or traditional financial services.
- Familiarity with application/network security best practices and secure coding patterns.
- Experience using AI tooling to accelerate development workflows.
- Experience with cloud providers, especially Google Cloud Platform (GCP).
- Front-end experience with React (for cross-functional collaboration).