Senior Frontend Software Engineer

ActiveCampaign•Chicago, IL

About The Position

As our next Senior Frontend Software Engineer , you won't just be building interfaces—you’ll be a vital member of our DUX (Developer and User eXperience) team shaping the frontend platform, improving architecture, developer experience, and the tooling that powers our micro-frontend ecosystem. You will be a key contributor to frontend architecture decisions and help drive platform-level improvements that elevate our entire engineering organization. This isn't just about writing code; it’s about shaping the future of our digital experience and seeing your contributions directly impact our company's trajectory. On a typical day, you might: Create and evolve new UI based on intricate designs and prototypes, ensuring technical feasibility and aesthetic precision. Develop and maintain Design System components to ensure a consistent, scalable, and high-quality user interface across the entire platform. Evaluate and optimize performance , meticulously analyzing browser rendering and API data loading to ensure peak efficiency. Collaborate cross-functionally with Product, Security, DevOps, DataOps, and SRE teams to drive integrated and influential technical solutions. Advocate for excellence by upholding rigorous coding standards, participating in deep code reviews, and mentoring others on best practices. Drive operational health by monitoring alerts and escalations to ensure all customer requirements are met with precision. Participate in an on-call rotation , ensuring the continuous reliability and stability of our mission-critical applications.

Requirements

6+ years of hands-on experience with JavaScript , both in the browser and within CLI (Node.js) environments.
Deep understanding of JavaScript and TypeScript fundamentals (closures, event loop, type narrowing, generics, etc.).
Strong, proven skills with React , specifically in high-growth environments with rapidly evolving needs.
Expertise in micro-frontend architectures , including hands-on experience with Module Federation and modern build systems like Nx, Rspack, or Webpack .
Command of Git and CI/CD pipelines , with a focus on streamlining deployment and ensuring high engineering standards.
Experience with agentic coding and familiarity with monitoring tools like Grafana (including Faro) .
A quality-driven mindset , featuring a strong focus on testing, ownership, and the ability to iterate repeatedly.
Data literacy , including at least a basic knowledge of SQL with the ability to write queries for reading and writing data.
Exceptional collaborative skills , with a proven ability to deliver value while navigating change in a fast-paced setting.

Nice To Haves

Technical versatility , ideally previous experience with PHP or other backend languages.
Familiarity with AWS infrastructure , specifically utilizing S3 and CloudFront for efficient build deployment, hosting, and edge caching strategies.

Responsibilities

Create and evolve new UI based on intricate designs and prototypes, ensuring technical feasibility and aesthetic precision.
Develop and maintain Design System components to ensure a consistent, scalable, and high-quality user interface across the entire platform.
Evaluate and optimize performance , meticulously analyzing browser rendering and API data loading to ensure peak efficiency.
Collaborate cross-functionally with Product, Security, DevOps, DataOps, and SRE teams to drive integrated and influential technical solutions.
Advocate for excellence by upholding rigorous coding standards, participating in deep code reviews, and mentoring others on best practices.
Drive operational health by monitoring alerts and escalations to ensure all customer requirements are met with precision.
Participate in an on-call rotation , ensuring the continuous reliability and stability of our mission-critical applications.

Benefits

Top-tier benefits package that includes a fully-covered High Deductible Health Plan (HDHP), complimentary access to telehealth services, and a free subscription to Calm.
Access to LinkedIn Learning, professional development programs, and career growth opportunities in a fast-growing organization.
Recharge and take the time you need to maintain work-life balance with open PTO.
Generous 401(k) matching with immediate vesting, quarterly perks with commuter and lunch benefits for hub based employees or a stipend for remote workers, and a four-week paid sabbatical with bonus after five years.
Work alongside brilliant, passionate colleagues in an environment that values innovation, teamwork, and mutual support.

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