Design and optimize high-throughput backend services for notifications, ensuring reliable delivery across various channels and enhancing user engagement through system improvements.
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’re looking for a Senior Software Engineer to join our Notifications Team, which powers the delivery and orchestration of notifications across all Client Portal. This system ensures that millions of users stay informed and engaged through email, push, in-app, and other channels, reliably and at scale - handling close to 10 million notifications every day for businesses and creators around the world. As a Senior Engineer, you’ll design and build systems that guarantee reliable, ordered, and context-aware delivery across multiple channels. You’ll work on challenges such as multi-channel routing, message deduplication, rate limiting, personalization, and observability - ensuring notifications are timely, secure, and contextually relevant. Collaborating closely with product, infrastructure, and data teams, you’ll help shape the future of one of the platform’s most critical communication systems.
Responsibilities
- Own and scale the Client Portal Notifications System, ensuring reliable, real-time delivery across in-app, push, email, and other channels within Courses, Communities, and GoKollab.
- Design and optimize high-throughput, event-driven backend services that process 10M+ notifications daily, maintaining high availability, ordering guarantees, and minimal latency.
- Implement features such as multi-channel routing, message deduplication, rate limiting, personalization, and delivery tracking to improve user engagement and system efficiency.
- Build robust observability into the notification pipeline—covering monitoring, logging, and distributed tracing—to proactively detect failures and improve delivery success rates.
- Ensure data security, privacy compliance (CAN-SPAM, GDPR), and safe storage of user communication preferences and delivery metadata.
- Collaborate with product, infrastructure, and frontend teams to design APIs, event schemas, and SDKs that simplify notification integration across all Client Portal products.
- Participate in architecture reviews, on-call rotations, and incident retrospectives to uphold operational excellence and continuous improvement.
Requirements
- 4+ years of hands-on software engineering experience building and scaling high-volume distributed systems or event-driven architectures.
- Strong backend engineering and distributed system design skills, with hands-on experience in API development, data modeling, and systems architecture using Node.js (NestJS preferred), TypeScript, PostgreSQL, MongoDB, and Redis.
- Expertise in backend performance optimization, caching strategies, and event-driven architectures (e.g., Redis, Kafka, Pub/Sub).
- Familiarity with notification protocols and integrations (SMTP, FCM, APNs, in-app SDKs) and email templating systems.
- Familiar with modern frontend frameworks (React, Vue, Angular), advanced UI engineering patterns, and CSS libraries like Bootstrap or Tailwind CSS.
- Advanced experience with complex state management libraries (e.g., Redux, Vuex, MobX) and architectural design of large-scale application state.
- Proven track record of optimizing frontend performance and web vitals at scale, including experience with server-side rendering (SSR), edge, or hybrid rendering architectures.
- Familiarity with frontend and backend observability - including monitoring, tracing, error tracking, and performance profiling in production (e.g., Grafana, Prometheus, Sentry, PostHog).
- Strong understanding of security best practices across the full stack—including authentication, authorization, access control, secure data flow, and privacy compliance.
- Excellent communication and cross-functional collaboration skills, able to drive complex initiatives, lead technical discussions, and mentor junior engineers.
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
Top Skills
Angular
Apns
Fcm
Grafana
Kafka
MongoDB
Nestjs
Node.js
Postgres
Posthog
Prometheus
Pub/Sub
React
Redis
Sentry
Smtp
Typescript
Vue
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