Principal Java Engineer - Backend Platform

Hawk-Eye Innovations; Basingstoke; Hybrid; GBP 100,000 - 140,000; Full time

Benefits offered by this job

25 days annual leave

Pension with 5% matching

Hybrid working model

Unmind wellbeing app

Onsite gym (Basingstoke)

Sporting events tickets

Sony group discounts

Job summary

Hawk-Eye Innovations in the United Kingdom is seeking a Principal Software Engineer (Full-Stack, Backend-leaning) to own backend architecture, data pipelines and API layer for a new sports technology product. You will work end-to-end across the stack within a small, fast-moving team to deliver high-performance live data capabilities.

You will shape edge-to-cloud data journeys, streaming and batch processing, and collaborate with data science and frontend colleagues to ensure robust contracts and

Qualifications

• Strong backend engineering background with production Java experience.
• Experience building low-latency, high-throughput systems.
• Ability to own end-to-end technical delivery across the stack.
• Collaborate with frontend engineers and define data contracts.
• Design and build backend services and APIs (REST/WebSocket).
• Own data storage and pipeline architecture; integration with streaming infrastructure.
• Implement authentication/authorization per cloud IAM approach.
• Provide technical direction and reviews for frontend work.
• Mentor engineers and lead technically within the team.
• Comfortable with ambiguity in product scope.

Responsibilities

• Design backend services and APIs for live data and historical analysis.
• Own data pipelines from edge ingestion to storage and delivery.
• Collaborate with data science and frontend teams on data contracts.
• Define and evolve API contracts (OpenAPI) and validation mechanisms.
• Ensure observability, reliability, and 24/7 operation.

Skills

Java backend

Low-latency systems

Event-driven architecture

React/TypeScript review

APIs design

Cloud infrastructure

Tools

Kafka

AWS

OpenAPI

SQS/AWS Batch

Job description

The Principal Software Engineer (Full-Stack, Backend-leaning) is a senior engineer responsible for the backend architecture, data pipelines, and API layer of a new sports technology product, while remaining capable of contributing to frontend development as needed. This role sits within a small, fast-moving product engineering team and requires someone comfortable owning end-to-end technical delivery across the stack, with backend and data work as the primary focus., You will be a core contributor to a new backend platform being built from scratch. The work spans the full data journey - from ingestion at the edge through to storage, transformation, and delivery to end users. Key areas of focus include:

• Low-latency data pipelines that ingest and process live sports tracking data, with strict latency requirements for time-critical outputs delivered to coaches and analysts in near real-time.
• Event-driven processing using Kafka for streaming data and control messages between on-site devices and cloud services, handling both fast-path live outputs and asynchronous post-processing workflows via SQS and AWS Batch.
• Cloud infrastructure on AWS, including Greengrass for edge-to-cloud orchestration, S3 for video and data storage, and Lambda for lightweight processing tasks.
• Data transformation and aggregation layers that normalise tracking outputs, store them in a data lake, and make them available to downstream consumers via clean API contracts.
• REST and WebSocket APIs that serve both a live data product for immediate consumption and an insights portal for historical analysis and performance comparison.
• Observability and reliability - instrumentation, logging, and tracing are built in from the start, not bolted on. The platform needs to run 24/7 without on-site support., Design and build backend services and APIs (REST/WebSocket) supporting data ingestion, transformation, and delivery to frontend and downstream consumers, with particular attention to latency and throughput given real-time processing requirements.
• Own data storage and pipeline architecture, including integration with streaming/event infrastructure.
• Implement authentication and authorisation in line with the team's chosen cloud identity and access management approach.
• Provide technical direction and review for frontend development (React/TypeScript), working closely with frontend engineers to align on approach, component contracts, and data shapes - this is a collaboration and oversight function rather than day-to-day frontend delivery.
• Collaborate closely with computer vision/data science engineers to define and consume data contracts.
• Participate in technical decision-making for a product in active development, including architecture choices with long-term implications for scale, latency, and maintainability.
• Contribute to technical leadership of the wider engineering team, given the seniority of this role.
• Hawk-Eye is committed to fostering an inclusive and diverse workplace. We ensure all employees are treated fairly, regardless of gender, marital status, race, nationality, religion, age, disability, or union membership. We value diversity and strive to create an environment where everyone can reach their full potential.
• Strong backend engineering background with production experience in Java (required).
• Demonstrated experience building low-latency, high-throughput systems - this is a core requirement, not a nice-to-have.
• Working knowledge of a modern frontend framework such as React/TypeScript, sufficient to review and direct frontend work rather than deliver it independently.
• Experience with cloud infrastructure and event-driven architectures (e.g. Kafka or equivalent streaming technology).
• Experience designing and evolving API contracts (OpenAPI or similar) in a fast-moving, still-evolving product environment.
• Familiarity with modern cloud identity and access management approaches (e.g. AWS Cognito or equivalent) is a plus.
• Strong communication skills - able to work directly with product and cross-functional stakeholders, and to mentor or direct engineers outside their own core discipline.
• Comfortable with ambiguity: this is a build-phase product with evolving scope and infrastructure decisions still being finalised.
• If you are passionate about building high-performance backend systems and want to work on real-time data products at scale, we would love to hear from you.
• 25 days annual leave (excluding bank holidays)
• Enhanced pension scheme with 5% matching
• Hybrid working model
• Complimentary Unmind wellbeing app
• Onsite gym (Basingstoke)
• Access to sporting events and tickets
• Sony Group Company discounts