Senior Go Backend Developer (f/m/d)

adjoe builds the technologies behind mobile apps growth and monetization. With our core product Playtime Arcade, we've become the global leader in rewarded advertising, an ad unit built on a simple premise: users earn real in-app rewards for engaging with new apps. The result is one of the most effective value exchanges in adtech, connecting advertisers and publishers with over 770 million users annually.Engineering the sub-millisecond decision engine that powers 200 million daily ad interactionsThe Demand Core team builds the infrastructure that determines which of our thousands of active advertising campaigns are relevant to a user the moment they open our ad unit Playtime. At our scale, system latency is a business failure, downtime means advertisers stop spending, users stop earning rewards, and publisher revenue stalls. You will build and operate the services that power these decisions 200 million times every day.Go microservices load the active ad campaign catalog into memory, evaluating 40+ targeting constraints and 30+ real-time signals, geo, fraud status, budget caps to rank potential user performance in milliseconds. Beyond campaign distribution, the team owns the entire ad interaction chain: processing clicks, views, MMP postbacks from Adjust and AppsFlyer, and in-app events that trigger rewards. These events are broadcasted through a hybrid messaging architecture using SNS/SQS and Kafka, directly powering our advertiser dashboards, publisher reward payouts, and ad campaign scoring pipelines, all backed by DynamoDB.Your Mission & Who We Are Looking For:Production Golang Systems Expertise: You bring 5+ years of backend development experience, including at least 3 years writing Go in production distributed environments. You will build and maintain our +99% Go microservice architecture—interfacing with our TypeScript/React frontend—to reliably handle 2+ million daily publisher interactions and scale beyond hundreds of millions of monthly active users.Hig