Senior JavaScript Platform Engineer

Attentive® is the AI-powered mobile marketing platform transforming the way brands personalize consumer engagement. Attentive enables marketers to craft tailored journeys for every subscriber, driving higher recurring revenue and maximizing campaign performance. Activating real-time data from multiple channels and advanced AI, the platform personalizes content, tone, and timing to deliver 1:1 messages that truly resonate.
With a top-rated customer success team recognized on G2, Attentive partners with marketers to provide strategic guidance and optimize SMS and email campaigns. Trusted by leading global brands like Neiman Marcus, Samsung, Wayfair, and Dyson, Attentive ensures enterprise-grade compliance and deliverability, supporting trillions of interactions across more than 70 industries. To learn more or request a demo, visit www.attentive.com or follow us on LinkedIn, X (formerly Twitter), or Instagram.
Attentive’s growth has been recognized by Deloitte’s Fast 500, Linkedin’s Top Startups and Forbes Cloud 100 all thanks to the hard work from our global employees!
About the RoleWe’re looking for an engineer who loves the plumbing of the web—someone who can design and ship a production‑ready JavaScript SDK that can be embedded on customer sites driving data collection of ecommerce and user behavior events. Think Google Tag Manager‑level loader logic and Segment‑style event pipelines—all delivered through a single <script> tag.  Collecting high-quality first-party data is foundational to powering the personalized marketing engine at the core of Attentive’s platform—enabling brands to deliver timely, relevant messages that drive engagement and revenue.
You’ll be part of the team that owns several critical components of Attentive’s data collection platform:• JavaScript library development of Attentive’s Tag to collect user behaviors in browser• Loader/bootstrap code, runtime APIs, plugin architecture, performance / bundle‑size budgets, security hardening, and robust telemetry• SDK enabling custom-coded on-site data collection• Build consent‑aware logic that adapts to Safari ITP, Firefox ETP, Chrome Privacy Sandbox, and shifting state‑level regulations.• Utilizing emerging technologies such as AI Agents to customize data collection on a per-customer basis

What You’ll Accomplish

• Design, build, and maintain SDKs in JavaScript (and possibly TypeScript) to interface with our platform’s APIs
• Work closely with product and API teams to align SDK development with platform features
• Optimize SDKs for performance, reliability, and ease of integration
• Create developer-friendly documentation, examples, and guides
• Monitor usage, gather feedback, and iterate based on developer needs

Your Expertise

• 6+ years building JavaScript libraries or tag managers consumed by external sites.
• Deep understanding of browser privacy tech: ITP, ETP, Privacy Sandbox, partitioned cookies, Storage Access API.
• Strong performance chops—async loaders, Web Workers, tree‑shaking.
• Exposure to edge runtimes (Cloudflare Workers, Fastly, AWS Lambda) or Node experience.
• Proven track record shipping telemetry / feature‑flag systems that can flip behavior instantly.

You'll get competitive perks and benefits, from health & wellness to equity, to help you bring your best self to work.
For US based applicants:- The US base salary range for this full-time position is $145,000 - $180,000 annually + equity + benefits- Equity is a substantial part of the total compensation package- Our salary ranges are determined by role, level and location
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Attentive Company ValuesDefault to Action - Move swiftly and with purposeBe One Unstoppable Team - Rally as each other’s championsChampion the Customer - Our success is defined by our customers' successAct Like an Owner - Take responsibility for Attentive’s success
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