Back End Developer (Java/Python) - Trading Systems

About the role

HashOptima is looking for a Backend Java/Python Developer to join its core development team. The successful candidate will work on greenfield projects building large-scale trading and quotation systems. The role involves the full software development lifecycle, from requirements and design through code, testing and deployment.

Key responsibilities

• Deliver high-quality production code for low-latency, high-throughput trading systems.
• Collaborate with the Research/Quant team to build and enhance trading and quotation models (pricing, hedging, delta-residual).
• Liaise with trading and product teams to develop new products and improve existing ones.
• Build and improve trading system infrastructure for large-scale positions, quotes and orders, and implement risk management and position-monitoring tools.
• Identify bottlenecks and bugs and drive solutions to their root causes.
• Mentor junior developers and lead design and code reviews.
• Be available during flexible hours for production emergencies.
• Use AI coding agents (e.g. Claude Code) in daily work: planning, ticket management, design generation, code writing and refactoring, test automation and code/security reviews, and improving team-level agent tooling.

Required profile

• 2+ years of experience across the full lifecycle of Java/Python application development.
• Excellent problem-solving ability and strong ownership mindset.
• Experience with high availability, high throughput, low latency systems; algorithmic trading, investment banks, hedge funds, brokerages or crypto exchanges is a plus.
• Flexibility with location, with preference for candidates in Asian time zones.
• A degree in Computer Science, Engineering, Mathematics or a related field is preferred.

Required skills

• Java and Python, with hands-on experience building trading, hedging and risk management systems.
• Spring / Spring Boot, MyBatis, MySQL, Redis, Kafka and cloud-native deployment.
• Event processing, multi-threading, enterprise integration patterns, web services and REST.
• Hands-on use of AI coding agents (Claude Code, Cursor, Copilot or similar); familiarity with CLAUDE.md, MCP integrations and prompt loops is strongly preferred.