Software Development Engineer III (Fullstack) - Contacts

About the role

About HighLevel:HighLevel is an AI-powered business operating system that gives agencies, entrepreneurs and SMBs the infrastructure to build, automate and scale. Today, HighLevel supports SMBs across 150+ countries, fueling community-driven growth rooted in real customer outcomes. To date, businesses operating on HighLevel have generated over $7 billion in ecosystem value, demonstrating the impact of shared infrastructure at scale. By centralizing conversations, automation and intelligence into one system, we help businesses move faster, reduce complexity and execute efficiently. Behind the platform, HighLevel powers more than 4 billion API hits and 2.5 billion message events daily. With 250 terabytes of distributed data, 250+ microservices and over 1 million domain names supported, our architecture is built for performance, resilience and long-term scalability.

Our people With over 2,000 team members across 10+ countries, HighLevel operates as a global, remote-first organization built for speed and ownership. We value initiative, clarity and execution, creating space for ambitious people to build systems that support millions of businesses worldwide. Here, innovation thrives, ideas are celebrated and people come first, no matter where they call home.

Our impact Every month, HighLevel enables more than 1.5 billion messages, 200 million leads and 20 million conversations for the more than 1 million businesses we support. Behind those numbers are real people building independence, expanding opportunity and creating measurable impact. We’re proud to be a part of that. Learn more about us on our YouTube Channel or Blog Posts

About the Role: The Contacts Team is at the heart of our CRM platform, managing the core infrastructure for contact records, views, filters, segmentation, and more. Every product surface (for example, automation, campaigns, pipelines, or reporting) interacts with Contacts. We're building scalable, reliable, and flexible systems that power millions of interactions daily.

In this role, you will drive technical outcomes as a hands-on Individual Contributor. You will own high-impact initiatives across the Contacts domain.

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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.

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Responsibilities:

• Architect & Scale: Design and build highly scalable and reliable backend services using Node.js, MongoDB, and ElasticSearch, ensuring optimal indexing, sharding, and query performance

• Frontend Development: Develop and optimize user interfaces using Vue.js (or React/Angular) for an exceptional customer experience

• Event-Driven Systems: Design and implement real-time data processing pipelines using Kafka, RabbitMQ, or ActiveMQ

• Optimize Performance: Work on autoscaling, database sharding, and indexing strategies to handle millions of transactions efficiently

• Cross-Functional Collaboration: Work closely with Product Managers, Data Engineers, and DevOps teams to align on vision, execution, and business goals

• Quality & Security: Implement secure, maintainable, and scalable codebases while adhering to industry best practices

• Code Reviews & Standards: Drive high engineering standards, perform code reviews, and enforce best practices across the development team

• Ownership & Delivery: Manage timelines, oversee deployments, and ensure smooth product releases with minimal downtime

• Mentor: Guide a team of developers, ensuring best practices in software development, clean architecture, and performance optimization

Requirements:

• 4+ years of hands-on software development experience

• Strong proficiency in Node.js, Vue.js (or React/Angular), MongoDB, and Elasticsearch

• Experience in real-time data processing, message queues (Kafka, RabbitMQ, or ActiveMQ), and event-driven architectures

• Scalability expertise: Proven track record of scaling services to 200k+ MAUs and handling high-throughput systems

• Strong understanding of database sharding, indexing, and performance optimization

• Experience with distributed systems, microservices, and cloud infrastructures (AWS, GCP, or Azure)

• Proficiency in CI/CD pipelines, Git version control, and automated testing

• Strong problem-solving, analytical, and debugging skills

• Excellent communication and leadership abilities—able to guide engineers while collaborating with stakeholders

Tech Stack:

• Backend: Node.js, Nest JS, REST APIs, Redis, Firestore, Mongo, Elastic search

• Frontend: Vue 2 + Vue 3 (Composition API), Pinia, TypeScript, Vite

• Infrastructure: Docker, Kubernetes, GCP

• Accessibility & Internationalization (i18n) best practices

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