Senior Software Engineer – Ad Tech (Reliability-First, Wrapper & Bidding)

About Adapex Adapex is a fast-growing ad monetization partner helping publishers maximize revenue through advanced header bidding, analytics, and optimization strategies. We work with a diverse portfolio of publishers globally, delivering scalable and high-performance monetization solutions.

Role Overview We are hiring a senior engineer to ship reliable, fail-safe monetization modules at high velocity. The primary focus is client-side programmatic infrastructure (Prebid.js wrapper execution, bidder integrations, auction telemetry, performance debugging). The secondary focus is GAM delivery, troubleshooting and reporting integrity. This role is hands-on, performance-sensitive, and closely tied to revenue outcomes.

What You’ll Build (Core Mission) Production-grade monetization modules that are: Fail-safe: graceful degradation, safe fallbacks, no revenue-killing regressions Observable: telemetry, error capture, performance metrics Fast to iterate: reusable templates, automated validation, controlled rollouts Primary Focus: Wrapper + Bidder Integrations (Client-Side) Own and extend our Prebid.js stack: modules, bidders, timeouts, auction behavior, deployment patterns. Deliver bidder integrations end-to-end: configuration → QA → rollout → monitoring → tuning. Diagnose auction underperformance: bid density, win-rate drivers, timeouts, floors, discrepancy root causes. Improve performance: async execution, caching, script loading strategy, latency budgets, Core Web Vitals impact. Build standardization tooling: reusable configurations, validation checks, rollout playbooks. Secondary Focus: GAM + Reporting Integrity Troubleshoot GAM delivery issues tied to header bidding (key-values, line items, creatives, underdelivery). Reduce discrepancies across GAM, SSPs, and internal reporting via better mapping, logging, and validation.

Engineering Workflow (Automation + Validation) We value engineers who use automation to ship faster without sacrificing reliability. This can include AI-assisted tools for prototyping, refactoring, or test generation, but the expectation is always: Clear correctness criteria and disciplined review before shipping Strong test coverage and regression protection Automated validation: config linting, synthetic auction tests, canary deployments Ability to harden generated code into maintainable production modules What Success Looks Like New bidder integrations shipped quickly with low incident rate Fewer silent failures and regressions in wrapper execution Reduced integration cycle time through reusable templates + automated QA Clear telemetry explaining revenue shifts and delivery issues Faster, more reliable troubleshooting for Ad Ops and publisher escalations Required Skills & Experience 4+ years software engineering experience with strong JavaScript in production Strong browser fundamentals: HTTP, async execution, performance profiling, DevTools debugging Experience building reliable systems: defensive coding, observability, rollback strategies, controlled releases Hands-on programmatic advertising experience; Prebid.js strongly preferred Prebid bidder/module development and auction debugging experience Experience building test harnesses for client-side real-time systems (mock bidders, timeouts, auction simulations) Working knowledge of GAM troubleshooting and reporting What Success Looks Like New bidder integrations shipped quickly with low incident rate Fewer silent failures and regressions in wrapper execution Reduced integration cycle time through reusable templates + automated QA Clear telemetry explaining revenue shifts and delivery issues Faster, more reliable troubleshooting for Ad Ops and publisher escalations Required Skills & Experience 4+ years software engineering experience with strong JavaScript in production Strong browser fundamentals: HTTP, async execution, performance profiling, DevTools debugging Experience building reliable systems: defensive coding, observability, rollback strategies, controlled releases Hands-on programmatic advertising experience; Prebid.js strongly preferred Prebid bidder/module development and auction debugging experience Experience building test harnesses for client-side real-time systems (mock bidders, timeouts, auction simulations) Working knowledge of GAM troubleshooting and reporting

Nice to Have Node.js for tooling and automation Analytics/event schema design for auction telemetry Familiarity with identity modules, consent gating, and quality signals (IVT/viewability) Why Join Adapex Work on high-scale monetization infrastructure with direct revenue impact Own critical parts of the wrapper/bidding stack end-to-end Solve performance and reliability problems that matter at scale

Screening Process Be prepared to share one example of a reliability-focused module you shipped: testing strategy, rollout plan, what failed in production, and how you prevented recurrence.