Job Summary:
JOB DESCRIPTION –Principal Engineer I, Prepurchase Platform
Location:London, UK
Division:TicketmasterUK Limited
LineManager:VP Engineering, Accounts, Identity and Pre-Purchase
Contract Terms:Full-time permanent, 40h/per week
THE TEAM
The Prepurchase Platform group owns the backend services that power every fan's path to a ticket. We handle event discovery, real-time seat availability, and interactive venue experiences at massive scale, processing billions of API calls during peakon-sales. Our engineers build systems that must be fast, resilient, and available when it matters most.
THE JOB
As a Principal Engineer on the Prepurchase Platform team, you will write code, build systems, and solve hard problems hands-on. This is a systems thinking role: you will reason carefully about distributed systemstradeoffs, understand why existing designs exist before proposing changes, and act on problems without waiting to be asked.
You will lead platform modernization efforts, design event-driven architectures, and deliver systems thatremainresilient during the highest-demand on-sales, working across multiple teams within the Prepurchase domain rather than within a single service area. The platforms you work on have no single correct implementation; they are a continuous series oftradeoffdecisions made under real constraints. Your value comes from understanding thosetradeoffsclearly and improving them deliberately, not from implementing solutions in a vacuum.
This is a hands-on technical role with no direct reports. You will write production code daily, influence technical direction, and partner with teams across Ticketmaster on cross-cutting architectural decisions. Depending on team needs, you may embed deeply within a single service area or work horizontally across multipleteams,the role flexes to where the highest-impact work is.
WHAT YOU WILL BE DOING
Champion resilience patterns: circuit breakers, graceful degradation, bulkheads, and auto-scaling strategies.
WHAT YOU NEED TO KNOW (or TECHNICAL SKILLS)
Proven ability to reasonaboutdistributed systemstradeoffs- scalability, consistency, availability, latency and make defensible design decisions under real constraints. This is the core bar for this role.
Expertisein Java (17+); and the JVM, withstrongcommand of JVM internals, garbage collection behavior, and performance tuning under load. Kotlin is a plus.
Hands-on experience with a reactive, non-blocking framework (Vert.x, SpringWebFlux, or equivalent) and asynchronous, event-driven service design.
Deep experience with stream processing and event-driven architecture - Kafka Streams, Apache Flink, or equivalent - including stateful streaming, topology design, and managing local state stores (e.g.RocksDB) at scale.
Proventrack recordbuilding high-throughput, low-latency systems where tail latency, backpressure, and memory pressure are first-class design concerns.
Strong command ofgRPC(including streaming RPC) and binary serialization formats such asFlatBuffers, Avro, orProtobuf, with schema evolution viaa registry.
Familiarity with Data-Oriented Design (DoD) - structuring code around how data is laid out, accessed, and transformed for cache efficiency and throughput, rather than around object hierarchies.
Experience with compact, search-oriented data structures (e.g.RoaringBitmap, succinct/bitsetrepresentations) forrepresentinglarge in-memory state efficiently. Experience with search engines (Elasticsearch,Solr) for discovery workloads is a plus.
Strong grasp of microservice design, service mesh (Istio/Envoy), API contract evolution, and backend-for-frontend patterns, includingGraphQLAPIs and WebSocket subscriptions for real-time client delivery.
Hands-on experience with AWS (EKS) and cloud-native operations - containerization (Docker, Kubernetes), packaging and deploy tooling (Helm,Kustomize), and infrastructure-as-code (Terraform)
Familiarity with observability tooling: Grafana, Splunk, Prometheus,OpenTracing, or equivalent.
YOU (BEHAVIOURAL SKILLS)
Systems Thinking: Understands distributed systems as a set oftradeoffs, not a set of correct answers.Understands that failuresemergefrom system interactions and missing feedback loops - not just broken components. Evaluates designs by asking why they exist and what constraints shaped them, not just whether they match a preferred pattern.
Domain Depth: Before changing a system, invests in understanding it fully - its history, theteamsand services it interacts with, the constraints that shaped its current design, and the forces
LIFE AT TICKETMASTER
We are proud to be a part of Live Nation Entertainment, the world’s largest live entertainment company.
Our vision at Ticketmaster is to connect people around the world to the live events they love. As the world’s largest ticket marketplace and the leading global provider of enterprise tools and services for the live entertainment business, we are uniquely positioned to successfully deliver on that vision.
We do it all with an intense passion for Live and an inspiring and diverse culture driven by accessible leaders, attentive managers, and enthusiastic teams. Ifyou’repassionate about live entertainment like we are, and you want to work at a company dedicated to helping millions of fans experience it, we want to hear from you.
Our work is guided by our values:
Reliability- We understand that fans and clients rely on us to power their live event experiences, and we rely on each other to make it happen.
Teamwork- We believe individual achievement pales in comparison to the level of success that can be achieved by a team
Integrity- We are committed to the highest moral and ethical standards on behalf of the countless partners and stakeholders werepresent
Belonging- We are committed to building a culture in which all people can be their authentic selves, have an equal voice and opportunities to thrive
EQUAL OPPORTUNITIES
We are passionate and committed to our people and go beyond the rhetoric of diversity and inclusion. You will be working in an inclusive environment and be encouraged to bring your whole self to work. We will do all that we can to help you successfully balance your work andhomelife. As a growingbusinesswe will encourage you to develop your professional and personal aspirations, enjoy new experiences, and learn from the talented people you will be working with.It'stalent that matters tousand we encourage applications from people irrespective of their gender, race, sexual orientation, religion, age, disabilitystatusor caring responsibilities.
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