Senior Conversion Tracking & API Engineer

Remote — International Hire ONLY | Contract Full-Time

TNT Growth is a performance-driven growth marketing agency that embeds directly into our clients' businesses to produce measurable outcomes across paid media, creative strategy, and analytics. We drive impact!

We are looking for a senior Conversion Tracking & API Engineer who can independently own complex, production-grade tracking across browser, server, CRM, and ad-platform APIs. You combine deep backend and data-integration expertise with a practical understanding of paid-media measurement and strong client-facing communication.

This is not a tag-only or passive back-end role. You will work directly with Growth Managers, Client Success, client engineering teams, and external platforms. You will own the path from consented browser and session capture through forms and CRM lifecycle events, event processing, ad-platform delivery, diagnostics, reconciliation, and monitoring. If you can build reliable systems, prove that they work end to end, and explain them clearly to non-engineers, this role was designed for you.

• Strong Communication
• Proactively flagging implementation gaps, risks, and unverified assumptions before a campaign goes live — and separating confirmed root cause from a working hypothesis
• Writing implementation and QA summaries that a Growth Manager without an engineering background can read, understand, and act on
• Responding to questions in Slack within a reasonable window during working hours
• Asking a clarifying question rather than building the wrong thing for two days
• Conversion Tracking Architecture & Identity

Design, build, and maintain client-side and server-side conversion tracking across Meta Pixel/CAPI, Google Ads API and Data Manager API, Enhanced Conversions and offline uploads, TikTok Events API, and other major platforms. Own signal design, event taxonomy, account and action routing, timestamps, value and currency, attribution windows, and accuracy from landing page to ad platform.

• CRM Integration & Event Pipeline Management

Build and maintain integrations among client sites and forms, CRMs such as HubSpot, Salesforce, or Zoho, call-tracking and scheduling tools, TNT infrastructure, and ad-platform APIs. Use webhooks, change data capture, OAuth, and queues to deliver events with validation, idempotency, retries and backoff, dead-letter handling, replay and backfill, and a complete audit trail.

• Browser, Identity & Cross-Domain Instrumentation

Implement and debug GTM, server-side GTM, Google tag and GA4, platform pixels, deterministic dataLayer events, first-party session IDs and cookies, URL propagation, and form injection across redirects, subdomains, SPAs, embedded forms, and booking tools. Preserve and validate GCLID, GBRAID, WBRAID, FBCLID, FBP, FBC, TTCLID, MSCLKID, UTMs, and consent state through the funnel.

• Ad-Platform API & Payload Engineering

Build platform-correct payloads and matching logic: normalize and hash permitted identifiers exactly once, send consent signals, pair browser and server events with stable event or order IDs, prevent double counting, handle adjustments and redactions, diagnose partial acceptance and attribution-window failures, and improve match quality using platform diagnostics.

• End-to-End QA, Reconciliation & Production Operations

Create synthetic tests that follow the real user journey from landing page through CRM and queue to the ad-platform UI. Reconcile source, database, CRM, internal reporting, and platform counts; monitor match quality, attribution lag, and delivery failures; produce evidence, alerts, runbooks, and incident updates; and verify fixes after launch.

• TypeScript Development

Write clean, well-tested TypeScript across the stack, including API clients, webhook handlers, and event workers. Own engineering quality through automated tests, code review, documentation, and maintainability.

• Data Layer & Database Work

Design and operate PostgreSQL schemas for attribution sessions, identities, conversion events, attempts, and delivery status. Write diagnostic SQL, optimize queries and indexes, plan retention, and trace data from ingestion through reporting without exposing sensitive data.

• AI-Assisted Development & Tooling

Use AI systems (Claude, ChatGPT, Copilot, and others) as force multipliers for debugging, code generation, documentation, and pattern recognition. Validate generated work and never trade tracking correctness, security, or maintainability for speed.

• Cross-Functional Communication & Ownership

Communicate clearly and proactively with Growth Managers, Client Success, client engineers, and platform support. Translate root cause, risk, evidence, dependencies, and ETA into updates non-engineers can act on. Own incidents through verification and follow-up, not just code deployment. Create reusable standards, runbooks, and guidance that raise the capability of the broader team.

• Version Control & Collaboration

Own your work in Git. Strong branching strategy, meaningful commit history, clean PRs, and collaborative review habits. You treat version control as a professional practice, not a formality.

• Senior-level, hands-on production experience with complex conversion tracking across Meta Pixel/CAPI and Google Ads API or Data Manager API, including Enhanced Conversions and offline conversions; additional TikTok, LinkedIn, Microsoft Ads, or Reddit CAPI experience is strongly preferred
• Hands-on browser and server-side instrumentation with GTM, server-side GTM or equivalent, Google tag and GA4, deterministic dataLayer events, SPAs, redirects, cross-domain and subdomain flows, embedded forms, and booking tools
• Expertise in attribution identity and matchback: GCLID, GBRAID, WBRAID, FBCLID, FBP, FBC, TTCLID, MSCLKID, first-party session IDs, cookies or URL propagation, consent state, and CRM persistence
• Deep knowledge of ad-platform pay