About company: https://www.hashoptima.com/

We are looking for a Backend Java/Python Developer to join our core development team. The successful candidate will participate in greenfield projects building large-scale trading and quotation systems. Daily tasks include, but are not limited to:

Responsibilities

Engage in all stages of the software development life cycle: establishing requirements, designing, writing code, testing, and deployment.
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 (e.g. pricing, hedging, delta-residual models).
Liaise with the trading and product teams to develop new trading products and improve existing ones.
Establish and improve trading system infrastructure to handle large-scale positions, quotes, and orders.
Implement and improve risk management and position-monitoring tools.
Identify system bottlenecks and bugs and drive solutions to root causes.
Mentor junior developers and lead design and code reviews.
Be available during flexible hours to address production emergencies.
Leverage AI coding agents (e.g. Claude Code) as a core part of the daily workflow — including project planning and Jira/ticket management, generating and reviewing technical designs, writing and refactoring production code, authoring and automating tests, and performing code/security reviews. Candidates are expected to be proficient in prompting, orchestrating, and validating agent output, and to continuously improve team-level agent tooling (skills, hooks, MCP integrations, CI automations).

Requirements

2+ years of experience in the full lifecycle of Java/Python application development.
Excellent problem-solving capabilities and strong ownership mindset.
Strong understanding of software design, architecture, development, and system integration.
Solid knowledge of event processing models, multi-threading, enterprise integration patterns, web services, and REST.
Solid knowledge of backend technologies such as Spring / Spring Boot, MyBatis, MySQL, Redis, Kafka, and cloud-native deployment.
Working proficiency in Python, with hands-on experience building trading, hedging, and risk management systems.
Experience with high availability, high throughput, low latency systems.
Hands-on experience using AI coding agents (Claude Code, Cursor, Copilot, or similar) to ship production code. Familiarity with agent-driven workflows — writing CLAUDE.md / rules files, building custom skills or slash commands, integrating MCP servers (Jira/Confluence/GitHub), and designing prompts and review loops that keep agent output reliable — is strongly preferred.
Experience with algorithmic trading systems, investment banks, hedge funds, trading firms, brokerages, or crypto exchanges is a plus.
Understanding of derivatives products such as options (pricing, Greeks, hedging) 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.
Contributions to internal developer tooling, agent skills, or AI-assisted engineering productivity is a plus.

Back End Developer (Java)