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Principal Full Stack Engineer

Fidelity Investments

Principal Full Stack Engineer

full-timePosted: Aug 13, 2026Updated: Sep 2, 2026NH, Merrimack

Job Description

Job Description:Note: Fidelity will not provide immigration sponsorship for this position. The TeamWe at Fidelity Trade Management Engineering (TME) group are responsible for building and maintaining Fidelity’s brokerage platform order management and trade processing system. We are high functioning, fast paced technology group that work on cutting edge technologies to deliver low latency and high throughput trading solutions. We want to work with an engineer who is versatile, always eager to take on new problems and share solutions as we push the technology forward. Working independently as well as collaboratively, it is important for this person to have a positive approach to leadership, teamwork, and a drive to deliver groundbreaking solutions every day.The Expertise You HaveHave at least a bachelor’s degree in Computer Science, Engineering, Information Technology or equivalent, with a preference for advanced studyMinimum 8 years of software design, development and performance testing experienceDeep hands-on experience in Software Performance EngineeringDemonstrated skill in Java, Spring, Python, LinuxHands on experience using tools like jMeter to build performance harness for software benchmarkingWillingness to guide and mentor junior team members on solid engineering practicesPrevious exposure to trading systems or brokerage technologyKnowledge of the FIX protocol is a plusThe Skills You BringAbility to understand end to end platform and identify issues that can cause performance, scalability or resilience issuesEffective analytical, communication, and organizational skills and a willingness to run with multiple tasks at a given timeThrive in a team environment, collaborating openly and actively contributingAble to innovate independently and work with leadershipFamiliarity with event driven and service-oriented processing is requiredDemonstrated work experience with cloud technologies. Industry certifications are welcome, but hands on experience and expertise are better. Walking the walk is the most important thingAn eye for detail and a skill for root cause analysis in diagnosing and mitigating production problems as quickly as possible in a dynamic, high value environmentThe Value you DeliverWork across organization and collaborate with teams to build highly scalable and resilient trading platformDeliver high quality, timely, cost effective and maintainable software solutions in an agile environment to meet functional and non-functional business requirementsActively contribute to the improvement of engineering practices such as code and design reviews, cloud strategy, and build and deployment pipelinesWork with squad lead and team tech lead on a frequent, recurring basis to design and implement novel solutions to complicated problemsAble to clearly present complex technical solutions, ideas, and plans to management, program teams, and less technical stakeholders as neededDevelop an understanding of the business domain you are working on and contribute to technology discussions with business partners and other external partiesInvestigate creative practices and help decide how to apply them within the team.Fidelity’s Onsite Working ModelFidelity is transitioning to a full-time onsite working model through a phased rollout across regions and roles. Currently, some roles and locations require 100% onsite presence, while others require less. Onsite expectations are likely to evolve as the rollout continues. This transition does not apply to fully remote roles.Certifications:Category:Information TechnologyPlease 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.

Locations

  • NH, Merrimack

Skills Required

  • Software Performance Engineeringintermediate
  • FIX protocol is a plusintermediate

Required Qualifications

  • Have at least a bachelor’s degree in Computer Science, Engineering, Information Technology or equivalent, with a preference for advanced study (degree in computer science)
  • Minimum 8 years of software design, development and performance testing experience (experience, 8 years)
  • Deep hands-on experience in Software Performance Engineering (experience)
  • Demonstrated skill in Java, Spring, Python, Linux (experience)
  • Hands on experience using tools like jMeter to build performance harness for software benchmarking (experience)
  • Willingness to guide and mentor junior team members on solid engineering practices (experience)
  • Previous exposure to trading systems or brokerage technology (experience)
  • Knowledge of the FIX protocol is a plus (experience)

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