Software Development Engineer III (Backend) - 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

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.

Backend Development

• Design, develop, and maintain scalable backend services and APIs.

• Build high-performance, reliable microservices capable of handling large-scale workloads.

• Write clean, efficient, and maintainable production-quality code.

• Develop reusable components and services following engineering best practices.

• Participate in technical design discussions and contribute to system architecture.

System Performance & Reliability

• Optimize backend services for scalability, performance, and availability.

• Troubleshoot production issues and implement sustainable solutions.

• Improve system reliability through monitoring, logging, testing, and observability.

• Participate in incident resolution and root cause analysis when required.

Collaboration

• Work closely with Product Managers, Designers, QA, and other engineers to deliver high-quality features.

• Participate in code reviews to maintain engineering standards and improve code quality.

• Share knowledge and collaborate with teammates to solve technical challenges.

• Contribute to continuous improvements in engineering practices, testing, and SDLC processes.

Requirements

• 5+ years of hands-on experience in backend software development.

• Strong experience with TypeScript and Node.js.

• Candidates with strong experience in JavaScript, Go, Java, Python, C#, or similar backend technologies, and willingness to work extensively with TypeScript and Node.js, are also encouraged to apply.

• Experience designing and building RESTful APIs and microservices.

• Strong understanding of distributed systems and event-driven architectures.

• Experience with relational and/or NoSQL databases, including schema design and query optimization.

• Knowledge of caching strategies, asynchronous processing, and message queues.

• Hands-on experience with Docker and containerized applications.

• Experience working with cloud platforms such as AWS or GCP.

• Familiarity with CI/CD pipelines and modern software development practices.

• Experience with observability and monitoring tools such as Grafana, Sentry, ELK, or similar.

• Strong understanding of software engineering principles, testing, and debugging techniques.

Preferred Qualifications

• Experience working on high-scale SaaS products.

• Familiarity with technologies such as Kafka, Redis, Elasticsearch, or similar distributed systems.

• Experience optimizing backend systems for performance and scalability.

• Exposure to Kubernetes and cloud-native architectures.

• Experience working in Agile development environments.

• Strong communication and collaboration skills.

What We Expect

• Ability to independently design, develop, test, and deploy scalable backend solutions.

• Passion for writing clean, maintainable, and well-tested code.

• Strong analytical and problem-solving skills.

• A collaborative mindset with the ability to work effectively across engineering, product, and infrastructure teams.

• Focus on improving performance, scalability, reliability, and developer productivity.

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