We are looking for a **mid-to-senior Java developer with FIX API experience**to help us integrate FIX API connections for broker platforms such as Interactive Brokers and Lime. You'll play a critical role in developing our live trading infrastructure, which supports low-latency, high-frequency executions at scale.
**This is an external role with immediate availability.**
**You are a good fit if you have experience with**:
**Backend (Languages & Frameworks)**:
- Java - Spring Boot, Jakarta EE **(Core requirement)**:
- Experience with FIX protocol integration using QuickFIX/J **(A must-have)**:
- Basic Python proficiency - Able to read and collaborate on ML components written in Python **(Core requirement)**
**Trading Systems & APIs**:
- Experience with financial APIs or trading systems **(Core requirement)**:
- Familiarity with order management systems (OMS) is a plus
- Understanding of low-latency or high-frequency architecture (bonus)
**Databases**:
- PostgreSQL or MySQL **(Core requirement)**:
- Redis or NoSQL systems (bonus)
**Tools & Others**:
- Git (Version Control)
- RESTful API Design and Integration
- Docker (for containerized backend services)
- WebSocket communication (for real-time signal processing)
- Agile/Scrum methodologies
**Responsibilities**:




- Integrate broker APIs using FIX protocol, especially QuickFIX/J
- Develop high-performance, low-latency backend components for live trade execution
- Build backend support for a proprietary Order Management System (OMS)
- Process real-time trading signals received via webhook and WebSocket
- Write clean, testable Java code for backend services
- Collaborate with Python/ML teams to integrate AI-generated trading strategies
- Participate in infrastructure decisions and code reviews
- Monitor and improve backend system performance, especially for HFT simulation
**Certificate**
**Bonus Points**:
- Prior experience with QuickFIX/J
- Experience in financial trading systems or fintech platforms
**Tags**:
(Java, Spring Boot, Jakarta EE, FIX API, QuickFIX, Python, Trading Systems, Low Latency, Git, REST API, PostgreSQL, Redis, WebSockets, Backend, OMS, HFT, Remote, Mid Level, Senior Level)
**Job Type**: Contract
**Education**:
- Bachelor's (required)
**Experience**:
- Java: 2 years (required)
- Fix Api: 2 years (required)
- Financial APIs or trading systems : 2 years (required)
**Language**:
- English (required)
**Location**:
- México Libre, Tamps. (preferred)

📌 Java Software Engineer (México Libre)
🏢 RocketDevs
📍 México Libre