The Software Development Engineer III will tackle platform stability, scalability, and optimization challenges, mentor engineers, and collaborate across teams to enhance a cloud-based phone system.
About HighLevel
HighLevel is a cloud-based, all-in-one white-label marketing and sales platform that empowers marketing 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, from marketing agencies to entrepreneurs to small businesses and beyond. Our platform empowers users across industries to streamline operations, drive growth, and crush their goals.
HighLevel processes over 15 billion API hits and handles more than 2.5 billion message events every day. Our platform manages 470 terabytes of data distributed across five databases, operates with a network of over 250 micro-services, and supports over 1 million domain names.
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
Every month, 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. Behind those numbers are real people growing their companies, connecting with customers, and making their mark - and we get to help make that happen.
Learn more about us on our YouTube Channel or Blog Posts
About the Role
We’re looking for a Software Development Engineer III with deep expertise in Node.js, MongoDB, and distributed systems, along with a strong focus on platform stability, scalability, and long-term technical excellence. You’ll join the platform team within our LC Phone System, which provides capability for purchasing phone numbers, Messaging, Calling, Compliance and Platform.
This role is backend-heavy, involving platform-level challenges such as system stability, performance optimization, tech debt reduction, security hardening, and cost efficiency. You’ll work on foundational improvements that enable the entire Phone System (including Calling, Messaging, and related services) to operate seamlessly under increasing demand.
Responsibilities
- Stabilize & Scale the Platform: Tackle systemic bottlenecks, improve fault tolerance, and ensure high availability for mission-critical phone services.
- Efficiency & Performance: Optimize resource usage (CPU, memory, network) to handle millions of operations while reducing cloud costs.
- Tech Debt & Modernization: Lead long-term refactoring efforts, deprecate legacy systems, and introduce scalable patterns.
- Security & Compliance: Strengthen data protection, access controls, and auditability across the platform.
- Developer Velocity: Improve tooling, observability, and automation to accelerate engineering workflows.
- Cross-Team Collaboration: Work with product, infrastructure, and other engineering teams to align on platform priorities.
- Mentorship & Leadership: Guide engineers, set architectural standards, and drive the platform roadmap.
Requirements
- 4+ years of backend engineering experience, including designing fault-tolerant systems and working on high-scale platforms.
- Deep expertise in distributed systems, event-driven architectures, and asynchronous job processing
- Strong experience with relational and NoSQL data models (especially with complex temporal data)
- Proven track record of architecting complex systems and delivering scalable, high-performance web apps in production.
- Strong understanding of software design patterns, API design, and microservices architecture in a multi-tenant environment.
- Skilled in guiding technical architecture, making high-impact engineering decisions, and mentoring fellow engineers.
- Experience with code quality practices, automated testing, CI/CD pipelines, and dev tooling optimization.
- Excellent problem-solving skills, with clear and collaborative communication across
Preferred Experience
- Experience with AI Tools and contributions to open-source tools, internal platforms or engineering blogs
- Experience with modern front-end frameworks (e.g., React, Vue, Angular) and building full-stack web applications.
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 record keeping, 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.
Top Skills
Asynchronous Job Processing
Distributed Systems
Microservices Architecture
Modern Front-End Frameworks
MongoDB
Node.js
NoSQL
Relational Databases
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