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

Position: 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, under delivery).

 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, Dev Tools

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, Dev Tools

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

…