Software Development Engineer III - Full Stack (Platform Frontend) at HighLevel

About Us HighLevel is an AI powered, all-in-one white-label sales & marketing platform that empowers agencies, entrepreneurs, and businesses to elevate their digital presence and drive growth. We are proud to support a global and growing community of over 2 million businesses, comprised of agencies, consultants, and businesses of all sizes and industries. HighLevel empowers users  with all the tools needed to capture, nurture, and close new leads into repeat customers. As of mid 2025, HighLevel processes over 4 billion API hits and handles more than 2.5 billion message events every day. Our platform manages over 470 terabytes of data distributed across five databases, operates with a network of over 250 microservices, and supports over 1 million hostnames. Our People With over 1,500 team members across 15+ countries, we operate in a global, remote-first environment. We are building more than software; we are building a global community rooted in creativity, collaboration, and impact. We take pride in cultivating a culture where innovation thrives, ideas are celebrated, and people come first, no matter where they call home. Our Impact As of mid 2025, our platform powers over 1.5 billion messages, helps generate over 200 million leads, and facilitates over 20 million conversations for the more than 2 million businesses we serve each month. Behind those numbers are real people growing their companies, connecting with customers, and making their mark - and we get to help make that happen. About the Role We are seeking a highly skilled Senior Full-Stack Engineer with strong front-end expertise and solid backend experience using Nest.js and MongoDB. The ideal candidate is exceptional in UI development while also having deep knowledge of backend architecture, API design, and performance optimization for high-traffic applications. You will work across the stack—building high-quality user interfaces, developing scalable backend services, and driving performance improvements end-to-end. This role also includes technical leadership, mentoring teammates, and contributing to engineering best practices. Key Responsibilities Frontend Engineering (Vue.js or similar) • Build performant, scalable, and reusable UI components. • Identify and fix performance bottlenecks (rendering, bundle size, API usage, caching). • Improve page load speed, responsiveness, and UX performance. • Maintain a clean and modular front-end codebase using modern TypeScript practices. Backend Engineering (Nest.js + Node.js) • Design and build scalable, maintainable APIs using Nest.js. • Work with MongoDB for schema design, indexing, aggregation pipelines, and query performance. • Implement secure authentication, authorization, and API best practices. • Optimize backend services for high throughput, low latency, and reliability. • Integrate microservices, message queues, or event-driven components (if required). Architecture & Engineering Leadership • Take ownership of medium-to-large features and deliver them end-to-end. • Lead performance-driven engineering improvements across the stack. • Evaluate and integrate open-source tools, libraries, and frameworks. • Mentor and guide junior engineers on frontend, backend, and system performance. • Collaborate closely with Product, Design, Platform, and QA teams. • Participate in code reviews, ensuring high quality and performance standards. Qualifications and Skills • 5+ years of professional full-stack or front-end-focused engineering experience. • Strong frontend experience (Vue.js is preferred; React experience is a plus). • Deep experience with Nest.js (or equivalent Node.js frameworks). • Strong understanding of MongoDB, schema modeling, indexing & query optimization. • Proven track record of improving performance in both frontend and backend codebases. • Solid understanding of browser behavior, rendering, caching, and web performance metrics. • Experience owning complex features and driving technical decisions. • Excellent communication and collaboration skills. Nice to Have • Experience with: Webpack, Vite, or other build tools; TypeScript advanced patterns; Redis, message queues, background jobs; CI/CD pipelines, GitHub Actions; Cloud platforms (AWS, GCP, DigitalOcean, Vercel) • Contributions to open-source projects. • Experience mentoring or leading a small team. Note: The responsibilities and qualifications mentioned above are representative and not exhaustive, and other tasks and duties may be assigned based on business needs EEO Statement:  The company is an Equal Opportunity Employer. As an employer subject to affirmative action regulations, we invite you to voluntarily provide the following demographic information. This information is used solely for compliance with government recordkeeping, reporting, and other legal requirements. Providing this information is voluntary and refusal to do so will not affect your application status. This data will be kept separate from your application and will not be used in the hiring decision. #LI-Remote #LI-MS1