Principal Python Engineer

Mitsui Sumitomo Insurance Group; New Jersey; On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Healthcare and Retirement Benefits

401(k) with employer match

Paid time off program

Job summary

Mitsui Sumitomo Insurance Group is seeking a Principal Python Engineer in New Jersey for a hybrid work role focused on developing intelligent systems for enterprise AI. You will design and implement Python-based solutions to automate decision-making processes, collaborating closely with various stakeholders to deliver impactful results.

The ideal candidate will have extensive experience in Python, a strong understanding of APIs, and proficiency in cloud platforms, alongside excellent communication skills. Join an innovative team at one of the world’s leading insurance groups!

Qualifications

• 8-10 years of professional software engineering experience.
• Strong focus on Python and its frameworks.
• Experience with cloud platforms and microservices architecture.

Responsibilities

• Design and maintain scalable backend systems and APIs.
• Lead technical design discussions and system architecture.
• Mentor junior engineers to enhance team capabilities.

Skills

Python

FastAPI

Flask

RESTful APIs

Cloud platforms (Azure)

Git

Unit testing

Integration testing

Tools

Docker

Kubernetes

CI/CD pipelines

Job description

## Principal Python EngineerApplyremote type: Hybridlocations: NJ-Warrentime type: Full timeposted on: Posted 27 Days Agojob requisition id: JR-000848MSIG USA continues to grow!**Company Overview:**MSIG USA is the US-based subsidiary of MS&AD Insurance Group Holdings, Inc., one of the world’s top P&C carriers and a global Class 15 insurer, with A+ ratings and a reach that spans 40+ countries and regions. Leveraging our 350-year heritage, MSIG USA brings the financial strength, expertise, and global footprint to offer commercial insurance solutions that address your business’s unique risks.Role Overview:Join us at the forefront of enterprise AI, building intelligent agentic systems that reason, plan, and take action across complex business workflows. You will design and implement Python-based agents that orchestrate models, tools, and data to automate real-world decision-making at scale. This role blends deep engineering with cutting-edge AI—working on everything from agent frameworks and APIs to safety, observability, and performance. If you are excited about shaping how autonomous systems operate in production, this is where you’ll make a tangible impact.**Key Responsibilities*** Design, develop, and maintain scalable backend systems and APIs using **Python.*** Lead technical design discussions and contribute to system architecture decisions.* Write clean, testable, and well-documented code following best practices - also with assistance of LLM.* Optimize application performance, reliability, and scalability.* Collaborate with product managers, designers, and other engineers to deliver end‐to‐end solutions.* Mentor junior and mid‐level engineers through code reviews, pairing, and technical guidance.* Drive improvements in code quality, tooling, CI/CD, and engineering processes.* Participate in on-call rotations and troubleshoot production issues when needed.**Required Qualifications*** 8-10 plus years of professional software engineering experience, with strong focus on **Python*** Deep understanding of Python frameworks such as **FastAPI, Flask** or similar* Experience building and consuming **MCPs, RESTful APIs** (and/or **GraphQL**)* Hands-on experience with **cloud platforms** - Azure experience preferred.* Solid understanding of software design principles, data structures, and algorithms* Experience with **unit testing, integration testing**, and test automation* Proficiency with **Git** and collaborative development workflows* Strong communication skills and ability to work in cross-functional teams.**Preferred Qualifications*** Experience with designing and building **agentic platforms.*** Experience with **microservices architecture*** Familiarity with **Docker, Kubernetes**, or container orchestration* Exposure to **event-driven systems**, message queues (Kafka, RabbitMQ)* Knowledge of **CI/CD pipelines** and DevOps best practices* Experience working in high-scale, production environments.* Prior experience mentoring or leading engineers.SALARY: The estimated salary range for this position is $140,000.00 - $200,,000.00 per year. This is a good-faith assessment of the salary range for this position only. In determining the actual salary within this range, MSIG USA will consider a candidate’s relevant experience, location, and other job-related factors. Additional Benefits: Healthcare and Retirement Benefits Comprehensive medical, dental, and vision coverage 401(k) with a generous employer match and profit-sharing contribution Wellness incentive program Life and accidental death and dismemberment (AD&D) insurance Flexible spending programs Short-term and long-term disability plans Additional Benefit Programs Paid time off program Paid charitable leave Paid parental leave Tuition reimbursement program Personal insurance (auto/homeowners) discounts #LI-HYBRID #LI-REMOTE, #LI-HYBRID, #LI-ONSITE It's an exciting time for our company and a great opportunity to join a financially sound and growing global insurance group!It is the policy of MSIG USA to provide equal employment opportunity (EEO) to all persons regardless of age, color, national origin, citizenship status, physical or mental disability, race, religion, creed, gender, sex, sexual orientation, gender identity and/or expression, genetic information, marital status, status with regard to public assistance, veteran status, or any other characteristic protected by federal, state or local law. In addition, MSIG USA will provide reasonable accommodations for qualified individuals with disabilities.