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# Principal Software Engineer

- **Company:** FIDELITY LLC
- **Location:** Jersey City, NJ, United States (Remote available)
- **Experience:** Expert
- **Salary:** $107,000.0 - $216,000.0
- **Contract:** Permanent contract
- **Skills:** Java (Programming Language), Artificial Intelligence, Algorithmic Trading, Amazon Web Services, Databases, Continuous Integration, Linux, Github, Python (Programming Language), Machine Learning, Apache Maven, Modular Design, Object-Oriented Software Development, Shell Script, Software Engineering, Feature Engineering, GitHub Copilot, Model Validation, Git, Information Technology, IBM UrbanCode Deploy, Jenkins, Artifactory
- **Published:** September 4, 2026
- **Apply:** https://www.themuse.com/jobs/fidelityinvestments/principal-software-engineer-344113

## About the Role

* Bachelor's degree in Mathematics, Computer Science, Engineering, Information Technology, or equivalent.
 * 10 years professional experience in quantitative finance or trading systems
 * Advanced proficiency in KDB/q, including:
 + Time-series data modeling
 + High-performance querying and joins
 + Real-time and historical analytics
 * Strong Python skills for:
 + Quantitative analysis
 + AI / ML model development
 + Integration with KDB and downstream systems
 + Experience working with large-scale, high-frequency, or noisy datasets
 + Solid software engineering practices (Git, testing, modular design)
 * Worked with AI developer assist tools (e.g. GitHub Copilot).
 * Experience with CI/CD tools such as GitHub, Maven, Jenkins, Artifactory, and uDeploy.
 * Hands-on experience in AWS or other cloud platforms., * Familiarity with object-oriented programming languages such as Java
 * Experience in Linux, shell scripting, and production support experience

The Skills You Bring:

 * A strong quantitative mindset with practical AI application skills
 * Ability to bridge research, machine learning, and production systems
 * Comfort working on front-office or research-critical infrastructure
 * Clear communicator with quants, traders, and engineers

Willingness to support production systems and participate in on-call rotations, including occasional weekend support.

## Description

We are seeking a highly experienced software engineer to lead the design and development of next-generation trading systems. This is a hands-on technical leadership role focused on building scalable, resilient, and high-performance trading infrastructure. You'll collaborate across teams, mentor engineers, and drive innovation in a mission-critical environment.

 * Design, develop, and optimize KDB databases and q analytics for high-volume trading and market data
 * Develop Python-based AI and quantitative models for research, prediction, classification, and signal generation
 * Apply machine learning techniques to time-series data (feature engineering, model training, evaluation)
 * Build research and backtesting frameworks integrating AI models with historical data
 * Translate quantitative and ML research into robust, production-ready systems
 * Integrate AI models into real-time and batch pipelines
 * Optimize analytics and model evaluation for performance, stability, and scalability
 * Collaborate with quants, product owners, and engineering teams on model deployment and monitoring


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