[Hiring] Software Development Engineer III - Email Deliverability @HighLevel

Role Description

We’re looking for a Software Engineer with deep expertise in Node.js, MongoDB, EKL stack and distributed systems, combined with a strong focus on platform stability, scalability, reliability, and long-term technical excellence. You’ll be joining our LC Email Platform team, which builds and maintains core capabilities such as:

• Emails messaging
• Email Verification
• Dedicated Domains and IPs
• Warmup Tool
• Email Inbox
• Platform integrations that power communication for thousands of businesses

Our Email platform currently processes over 1.5 Billion messages per month, and we are on a strategic journey to scale this to 4 Billion messages per month, aiming to become the leading BSP (Business Service Provider) in the industry. Similarly, our platform supports 450K+ active businesses using our email services, and we’re aggressively scaling this to 1 Million+ users as we expand our global footprint. This growth trajectory demands a leader who can architect highly scalable systems, anticipate platform bottlenecks, and design infrastructure capable of supporting massive scale with predictable performance.

This role requires someone who is comfortable working on high-scale, mission-critical platform components. You’ll take ownership of challenges related to:

• System stability
• Performance optimization
• Distributed architecture improvements
• Operational efficiency
• Cost management
• Security hardening across our Email infrastructure

You will drive architectural decisions, lead complex problem solving, reduce long-standing tech debt, and ensure our services remain resilient, observable, and compliant with various Email Service Providers (ESP) requirements.

As a technical leader, you will collaborate closely with product, infrastructure, and cross-functional engineering teams to:

• Design robust APIs
• Improve end-to-end delivery pipelines
• Enhance monitoring and alerting
• Streamline platform operations
• Shape the long-term technical roadmap for the entire Email ecosystem within HighLevel

You will play a pivotal role in scaling our platform to the next order of magnitude while delivering exceptional reliability and performance for our global customer base.

Qualifications

• 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 teams.

Requirements

• Comfortable working on high-scale, mission-critical platform components.
• Ability to tackle systemic bottlenecks and improve fault tolerance.
• Experience in optimizing resource usage (CPU, memory, network) to handle millions of operations while reducing cloud costs.
• Capability to lead long-term refactoring efforts and deprecate legacy systems.
• Strengthening data protection, access controls, and auditability across the platform.
• Improving tooling, observability, and automation to accelerate engineering workflows.
• Guiding engineers, setting architectural standards, and driving the platform roadmap.

Company Description

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.

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.

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.