SDK Developer

Job Description

Proem Sports is a sportstech firm working with sport and live event organisations to drive commercial performance. We have built a customer data platform which unifies data from all fan touchpoints to provide in-depth analytics, a fan segmentation engine and marketing capabilities to deliver actionable insights along with engagement capabilities. We are looking for a Senior SDK Developer who will play a crucial role in developing the user-facing aspects of our Customer Data Platform (CDP). This role is ideal for someone with 4-7 years of hands-on experience in frontend development. This role goes beyond traditional frontend development?our ideal candidate will also work on tracking-based ecosystems, messaging integrations, and engagement solutions for web and mobile platforms. You will be responsible for implementing real time event tracking, building SDKs, and enabling push and in-app notifications. Key Responsibilities: Develop, test, and maintain user-friendly web applications using React.js. Take ownership of our tracking ecosystem , integrating and refining our javascript tracking SDK . Collaborate with backend engineers to ensure seamless event tracking, data collection, and real-time insights. Build and optimise push notification systems, in-app messaging, and on-site engagement tools using Firebase Cloud Messaging (FCM) and Service Workers . Ensure scalable and accurate event tracking across web and mobile platforms. Work with mobile developers to facilitate cross-platform communication ( React Native, native app tracking, push notifications ). Develop real-time analytics dashboards and visualisation tools using Chart.js, D3.js, or Recharts . Optimise frontend performance, ensuring efficient data fetching, caching, and rendering strategies. Ensure UI/UX designs are technically feasible and optimised for cross-browser compatibility and performance. Stay up to date with emerging frontend, tracking, and engagement technologies. Requirements: Strong proficiency in React.js, Next.js, JavaScript (ES6+), TypeScript, HTML, and CSS . Experience of building mobile app SDKs using Kotlin, Objective-C/Swift, and React Native . Experience with frontend build tools such as Webpack, Gulp, or Grunt . Strong expertise in CSS for responsive and visually appealing interfaces. Knowledge of event-driven architectures, WebSockets, and real-time data processing . Experience with tracking technologies ( Snowplow, Segment, Amplitude, Mixpanel, or Google Analytics ). Understanding of service workers and browser push notification APIs. Experience with RESTful APIs, GraphQL , and handling data efficiently. Familiarity with Git and version control workflows. Strong problem-solving skills and ability to debug tracking issues effectively. Ability to write clean, efficient, and maintainable code. Preferred Qualifications: Experience with server-side rendering (Next.js, React Server Components) . Familiarity with real-time event processing pipelines ( Kafka, Firehose, Airflow ). Exposure to mobile app tracking SDKs and cross-platform engagement ( React Native, Firebase Analytics ). Understanding of cloud-based services such as AWS ( S3, Lambda, Kinesis ). Experience working in Agile/Scrum development environments. Exposure to A/B testing, personalization engines, and growth engineering principles. What We Offer: Opportunity to be an early team member in a high-impact startup Ownership and autonomy in shaping product UI/UX Collaborative, innovation-driven culture Competitive compensation and potential equity options