Principal Software Engineer - Hybrid -Datafeed Server

FactSet; London; Hybrid; GBP 60,000 - 90,000; Full time

Job summary

A leading company in financial data analytics is seeking a Principal Software Engineer to develop innovative solutions for a wide array of clients. This hybrid position involves collaborating with cross-functional teams to deliver high-quality software solutions, utilizing advanced programming skills and understanding of real-time data processing. Ideal candidates will have extensive experience in C/C++ development and a Bachelor's degree in Computer Science or a related field.

Qualifications

• 8+ years of software engineering experience required.
• 5+ years in C/C++ within a Linux environment.
• Experience in developing APIs and low latency systems.

Responsibilities

• Develop, test, and deploy software and services.
• Design user-friendly APIs for real-time market data.
• Collaborate with product developers and users.

Skills

C or C++

Network programming

Effective communication

Education

Bachelor’s Degree in Computer Science or equivalent

Tools

ZeroMQ

AWS

Azure

Java

.NET Core / C#

Go

Python

Job description

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Principal Software Engineer - Hybrid - Datafeed Server, London

Client: FactSet

Location: London, United Kingdom

Job Category: Other

EU work permit required: Yes

Job Reference:

f5a04da3918b

Job Views:

45

Posted:

24.06.2025

Expiry Date:

08.08.2025

Job Description:

Responsibilities:

• Develop, test, and deploy software and services to end users.
• Design and implement user-friendly APIs that deliver streaming real-time market data.
• Participate in and contribute to design reviews, code reviews, and brainstorming sessions.
• Communicate and collaborate with product developers, QA, API users, and other stakeholders.
• Respond to bug reports and feature requests.
• Participate in an on-call rotation.

Minimum Requirements:

• 8+ years of professional software engineering experience.

Critical Skills:

• 5+ years of experience developing software in C or C++ in a Linux environment.
• Fundamental understanding of network programming.
• Ability to communicate effectively with peers within FactSet and with external users.
• Track record of success developing and shipping software on time.

Additional / Desired Skills:

• Familiarity with ZeroMQ.
• Experience writing software for Windows.
• Experience developing software intended to run in a public cloud environment such as AWS or Azure.
• Experience developing APIs.
• Understanding of real-time market data and the requirements for processing large amounts of input with low latency.
• Ability to work in groups and independently.
• Experience developing software in languages such as Java, .NET Core / C#, Go, Python.

Education:

• Bachelor’s Degree or higher in Computer Science or equivalent.

Company Overview:

FactSet (NYSE:FDS | NASDAQ:FDS) helps the financial community to see more, think bigger, and work better. Our digital platform and enterprise solutions deliver financial data, analytics, and open technology to more than 8,200 global clients, including over 200,000 individual users. Clients across the buy-side and sell-side, as well as wealth managers, private equity firms, and corporations, achieve more every day with our comprehensive and connected content, flexible next-generation workflow solutions, and client-centric specialized support. As a member of the S&P 500, we are committed to sustainable growth and have been recognized among the Best Places to Work in 2023 by Glassdoor as a Glassdoor Employees’ Choice Award winner. Learn more at and follow us on and.