Principal Full Stack Engineer (Python, AWS, REST)

Job Description: Deliver on the vision of the business by leading the development, research, and recommendation of appropriate models, methods, tools, and technologies to achieve business-unit-wide solutions. Use thought leadership to drive and champion technology strategy in partnership with stakeholders across the business. Manage significant risks and lead and oversee a team of developers who build and support runtime services, platforms, and applications that power AI-enabled experiences at scale. The Role You will be part of the team responsible for the creation and support of the Cognitive Computing Platform. This platform enables customers to interact with Fidelity in natural language across the channels that are important to them. You’ll help deliver reliable runtime services and operational practices that allow teams to run AI-enabled solutions consistently and safely. The Team As part of the team, you will implement solutions that enable customers to get the most out of what Fidelity can offer. You will create intuitive and highly engaging conversational experiences that help digitally savvy customers take control of their finances and feel confident in the choices they make. The Expertise You Have (Preferred Qualifications) Experience across the software development and delivery lifecycle DevOps/SRE practices (monitoring, alerting, incident response, reliability mindset) Node.js and/or Python API and service experience: REST APIs, Service-Oriented Architecture, Object-Oriented Programming OpenAPI/Swagger and JSON-based contracts Agile development methodologies Cloud exposure (AWS, Azure) e.g. DynamoDB, ElasiCache AI / GenAI Skills (Preferred) Working knowledge of LLM concepts (prompting patterns, token limits, latency considerations) Retrieval-Augmented Generation (RAG) fundamentals and embedding-based search concepts Model evaluation basics (quality, safety, and regression testing) Responsible AI practices (guardrails, privacy considerations, and secure usage patterns) Operational awareness for GenAI solutions (cost, performance, reliability, and safe usage) Education / Certifications (Helpful) Undergraduate degree (BS, BA, etc.) or equivalent work experience Relevant cloud, DevOps/SRE, or AI/ML certifications are a plus The Skills You Bring Strong desire and ability to learn new technologies and approaches Ability to synthesize business needs into scalable technology solutions Ability to work across organizations and drive positive outcomes Comfort operating in a polyglot development environment Excellent verbal and written communication skills Ability to collaborate with data science and product teams to operationalize AI use cases The Value You Deliver Build and deliver scalable solutions on a scrum team benefiting multiple business units Work across an empowered and autonomous organization to achieve the best outcomes Promote a developer culture of quality and sustainability through automation Mentor team members to support organizational goals Help teams operationalize GenAI solutions with attention to reliability, safety, and repeatability Certifications: Category: Information Technology Most roles at Fidelity are Hybrid, requiring associates to work onsite every other week (all business days, M-F) in a Fidelity office. This does not apply to Remote or fully Onsite roles. Some roles may have unique onsite requirements. Please consult with your recruiter for the specific expectations for this position. Please be advised that Fidelity’s business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Those laws and regulations may restrict Fidelity from hiring and/or associating with individuals with certain Criminal Histories. At Fidelity, we are passionate about making our financial expertise broadly accessible and effective in helping people live the lives they want! We are a privately held company that places a high degree of value in creating and nurturing a work environment that attracts the best talent and reflects our commitment to our associates. We are proud of our diverse and inclusive workplace where we respect and value our associates for their unique perspectives and experiences. For information about working at Fidelity, visit FidelityCareers.com. Fidelity Investments is an equal opportunity employer. Fidelity will reasonably accommodate applicants with disabilities who need adjustments to participate in the application or interview process. To initiate a request for an accommodation please contact the following: For roles based in the US: Contact the HR Leave of Absence/Accommodation Team by sending an email to accommodations@fmr.com, or by calling 800-835-5099, prompt 2, option 2 For roles based in Ireland: Contact AccommodationsIreland@fmr.com For roles based in Germany: Contact Accommodationsgermany@fmr.com Fidelity Privacy Policy