Senior Software Engineer – Data Platform

We’re looking for a Senior Software Engineer to join our team building and operating the core data platform that powers our business. This platform sits at the heart of everything we do, delivering high‑quality, real‑time market data to systems and teams across the organisation. If you enjoy working on high‑throughput, low‑latency systems at massive scale, and want to take ownership of meaningful, business‑critical problems, this role is for you.

You’ll be working on a distributed, event‑driven platform responsible for processing billions of market data messages per day. This is a high‑performance environment where reliability, scalability, and correctness are essential. Your work will support downstream systems that depend on timely, accurate market data for analytics. You’ll collaborate closely with engineers, product teams, and stakeholders to design, build, and operate resilient systems that handle extreme data volumes with precision, while also maintaining a strong focus on cost efficiency, scalability, and operational excellence.

• Design and build scalable, real‑time data processing systems using technologies such as Apache Flink and Kafka.
• Develop high‑quality, maintainable code for Apache Flink (Java) data processing and .NET APIs.
• Lead and contribute to collaborative system design, taking end‑to‑end ownership from implementation to production support.
• Build production‑grade systems with a strong focus on observability, monitoring, and operational excellence, enabling rapid detection and resolution of issues.
• Work with AWS services to build cloud‑native, highly available systems; define and manage infrastructure using Terraform.
• Implement CI/CD pipelines and deployment workflows using tools such as Harness.
• Optimize systems for performance, latency, throughput, and cost.

• Excellent collaboration and communication skills.
• Strong experience in distributed systems and event‑driven architectures.
• Hands‑on experience with Apache Flink (or similar stream processing frameworks) and Kafka or other messaging systems.
• Strong proficiency in .NET or Java.
• Experience building systems that are highly observable and operationally mature, with strong monitoring, logging, and alerting practices.
• Strong understanding of performance tuning, scalability, and fault tolerance.
• Good understanding of cost implications when designing systems, including the ability to project costs as we scale.

• Work on systems that are mission‑critical to the entire business.
• Operate and evolve a platform handling billions of messages per day.
• Solve complex engineering challenges at massive scale.
• Be part of a team that values ownership, collaboration, and delivery.
• Opportunity to shape a high‑performance, cost‑efficient, and highly observable data platform.

Base Salary: GBP 68,200.00‑95,333.33
Bonus Target: 12.5% Annual

Morningstar’s hybrid work model offers four days of in‑office work each week, complemented by flexible arrangements that enable team collaboration and individual focus.

Morningstar is a global independent investment research and financial data company. We are strongly committed to creating and preserving equal opportunity for all employees and applicants. We make all employment decisions—without regard to race, color, ancestry, religion, sex, national origin, age, disability, protected veteran status, marital status, sexual orientation, genetic information, citizenship, gender identity and expression, parental status, or other legally protected characteristics or conduct.