In the fast-evolving world of blockchain and cryptocurrency, security is no longer optional—it's imperative. As digital assets grow in value and adoption, so do the threats targeting them. At OKX, one of the leading crypto trading platforms and Web3 ecosystems, safeguarding user assets and maintaining platform integrity are top priorities. With over 20 million trusted users across 180+ markets, OKX continues to scale its engineering capabilities—particularly in Singapore, where its Product and Engineering hub drives innovation for its global platform.
This role as a Staff Engineer in Blockchain Security and Monitoring sits at the intersection of advanced blockchain analysis, real-time threat detection, and large-scale system architecture. You’ll be responsible for building systems that protect millions of users from malicious actors, detect vulnerabilities before they’re exploited, and ensure the platform remains resilient against emerging threats.
Core Responsibilities
Design and Implement a Blockchain Monitoring Backend
You’ll lead the development of a robust backend monitoring system using Spring Boot, engineered for high availability and real-time responsiveness. This system will serve as the backbone for tracking on-chain activities across multiple blockchains, enabling rapid detection of suspicious behavior.
👉 Discover how top engineers are shaping the future of blockchain security today.
Develop On-Chain Threat Detection Algorithms
One of your primary missions will be to design and refine algorithms that identify hacker-controlled addresses and track illicit fund flows. By analyzing transaction patterns, clustering techniques, and behavioral anomalies, you'll help build an intelligent alert system capable of flagging high-risk activities as they happen.
This includes:
- Real-time monitoring of transaction sequences
- Detection of known attack signatures (e.g., flash loan exploits, phishing contracts)
- Integration with threat intelligence feeds and blacklisted addresses
Visualize Fund Flows with Transaction Graphs
Understanding how funds move across chains is critical to forensic investigations and proactive risk mitigation. You’ll construct transaction relationship graphs that map complex fund transfers between wallets and smart contracts. These visualizations will empower security analysts to trace stolen assets, uncover money laundering patterns, and respond swiftly to breaches.
Built using graph databases and analytics tools, these systems will support both automated analysis and manual exploration during incident response.
Expand Multi-Chain Monitoring Capabilities
The blockchain landscape is multi-chain—and so must be our defenses. You’ll integrate monitoring functionalities across major public chains including Ethereum (ETH), Bitcoin (BTC), Binance Smart Chain (BSC), and others. Each chain presents unique challenges in data structure, consensus mechanisms, and attack vectors—all of which require tailored detection logic.
Your work will ensure consistent visibility regardless of the underlying network.
Build Secure Sandbox Environments with Revm
To anticipate attacks before they occur, you’ll leverage Revm, a high-performance Ethereum Virtual Machine (EVM) implementation written in Rust. Using Revm, you’ll create sandboxed environments to simulate on-chain transactions and smart contract executions under controlled conditions.
These simulations allow you to:
- Test potential exploit scenarios safely
- Detect MEV (Maximal Extractable Value) risks
- Identify vulnerabilities in contract logic or permission configurations
This proactive approach strengthens the platform’s resilience against zero-day exploits and sophisticated adversarial strategies.
Establish Real-Time Alerting Across Key Risk Dimensions
Security monitoring isn’t just about data—it’s about timely action. You’ll architect a real-time alert system that monitors multiple risk indicators simultaneously, including:
- Abnormal gas consumption spikes
- Sudden changes in smart contract permissions
- Large-scale fund movements from known vulnerable protocols
- Suspicious inter-contract calls
By correlating signals across layers, the system will reduce false positives while increasing detection accuracy.
Research Emerging Threats and Improve Detection Rules
Cyber threats evolve daily. As a Staff Engineer, you’ll stay ahead of the curve by researching cutting-edge attack methodologies, from DeFi exploits to cross-chain bridge vulnerabilities. Your findings will directly inform updates to detection rule sets and contribute to comprehensive security incident analysis reports used internally and shared with partners when necessary.
What We’re Looking For
To excel in this role, you should bring a strong foundation in software engineering combined with deep interest or experience in blockchain security. Here’s what we value:
- A Bachelor’s or Master’s degree in Computer Science, Network Security, or a related technical field
- Proficiency in at least one mainstream programming language: Java, Python, or Rust
- 3+ years of professional Java development experience, with demonstrated expertise in Spring Boot, Spring Cloud, and microservices architecture
- Solid knowledge of distributed systems technologies: Kafka, Redis, Elasticsearch, and relational databases like MySQL
- Hands-on experience building blockchain analyzers or security tools—especially those leveraging Revm-based sandboxes
- Familiarity with Revm internals, including simulating proof-of-concept (POC) attacks and testing in isolated environments
While prior experience in blockchain security is highly beneficial, we welcome candidates who are passionate about learning and applying their skills to decentralized systems.
Why This Role Matters
Blockchain security impacts real people. A single exploited vulnerability can result in millions lost. Your work will directly contribute to protecting user assets, maintaining trust in the OKX platform, and advancing the broader mission of secure Web3 infrastructure.
You won’t just be writing code—you’ll be shaping the future of how crypto platforms defend themselves in an increasingly adversarial environment.
👉 See how you can lead innovation in blockchain security with cutting-edge tools and global impact.
Frequently Asked Questions (FAQ)
Q: Is this role based in Singapore?
A: Yes, this position is based at OKX’s Singapore office, which serves as a key Product and Engineering hub for its global operations.
Q: Do I need prior experience in blockchain to apply?
A: While direct blockchain or crypto experience is preferred, strong engineers with backgrounds in security, distributed systems, or real-time data processing who are eager to transition into blockchain are encouraged to apply.
Q: What kind of security threats does OKX monitor for?
A: We monitor for a wide range of threats including smart contract exploits, phishing attacks, flash loan manipulations, insider risks, and cross-chain vulnerabilities.
Q: How does Revm enhance security testing?
A: Revm allows us to run Ethereum-compatible code in a fast, safe environment where we can simulate transactions, test exploit scenarios, and analyze contract behavior without risking live funds.
Q: Are remote candidates considered for this role?
A: Currently, this role is location-specific and requires presence in Singapore. However, OKX offers various remote-friendly positions across its global teams.
Q: What career growth opportunities exist for engineers at OKX?
A: Engineers at OKX have clear paths for technical advancement, including progression to Principal Engineer roles, leadership in architecture design, and ownership of critical platform components.
Keywords Mined & Integrated
- Blockchain security
- On-chain monitoring
- Real-time alert system
- Revm sandbox
- Transaction graph analysis
- Multi-chain monitoring
- Spring Boot backend
- MEV risk detection
These keywords reflect the core competencies and technologies central to the role, naturally embedded throughout the content to align with search intent while maintaining readability.
By joining OKX as a Staff Engineer in Blockchain Security and Monitoring, you’re not just taking on a job—you’re stepping into a pivotal role that defends one of the world’s most trusted crypto platforms. If you're ready to tackle complex challenges at scale and make a tangible impact in the Web3 space, this is your opportunity.
👉 Take the next step in your blockchain engineering career—where innovation meets security.