Backend Engineer

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

The candidate should have extensive experience in designing and developing scalable data pipelines and real-time data processing solutions. As a key member of the team, the Senior Data Engineer will play a critical role in building end-to-end data workflows, supporting machine learning model deployment, and driving MLOps practices in a fast-paced, agile environment. Strong expertise in Apache Kafka, Apache Flink, AWS SageMaker, and Terraform is essential. Additional experience with infrastructure automation and CI/CD for ML models is a significant advantage.

Key Responsibilities

1. Design, develop, and maintain high-performance ETL and real-time data pipelines using Apache Kafka and Apache Flink.
2. Build scalable and automated MLOps pipelines for training, validation, and deployment of models using AWS SageMaker and associated services.
3. Implement and manage Infrastructure as Code (IaC) using Terraform to provision and manage AWS environments.
4. Collaborate with data scientists, ML engineers, and DevOps teams to streamline model deployment workflows and ensure reliable production delivery.
5. Optimize data storage and retrieval strategies for large-scale structured and unstructured datasets.
6. Develop data transformation logic and integrate data from various internal and external sources into data lakes and warehouses.
7. Monitor, troubleshoot, and enhance performance of data systems in a cloud-native, fast-evolving production setup.
8. Ensure adherence to data governance, privacy, and security standards across all data handling activities.
9. Document data engineering solutions and workflows to facilitate cross-functional understanding and ongoing maintenance.

At least 4 years' experience as a Node.js developer.

Experience in Microservices

Extensive knowledge of JavaScript, web stacks, libraries, and frameworks.

Mandatory experience in Postgres and MySql.

Knowledge of front-end technologies such as HTML5 and CSS3.

Superb interpersonal, communication, and collaboration skills.

Exceptional analytical and problem-solving aptitude.

We are seeking extremely smart programmers who are gung ho about building large scale systems that are going to have a big impact on millions of customers.

Responsibilities:

• Design and develop products by working closely with business team.
• Gain experience with hands on coding and independent ownership of software components.
• Build performant, scalable, enterprise ready back end architectures that can support millions of users in parallel.
• Follow strong engineering best practices and champion their adoption.

Requirements:

• 2+ years’ experience in software product development and delivery.
• Bachelors or Masters degree in engineering from a reputed institute(preferably IITs, NITs, or other top engineering institutes).
• Strong grasp of CS fundamentals, algorithms and excellent problem solving abilities.
• All experience should be from good product development or e-commerce background.
• Must have shown good stability in all your previous associations.
• Have strong backend knowledge and cloud development exposure.
• Expert at Java, Spring boot, Hibernate, REST API development.
• Worked with at least 1 RDBMS (Mysql preferred). NoSql is a plus.
• Have used or are very hands-on with Microservices, Docker, Kubernetes, Gradle/Ant, Kafka, GIT/bitbucket in a very agile work place.
• Writing high quality code which is made better by unit tests and integration tests is how you work.
• Comfortable with exploring proven open source tech stack like Grafana, Kibana, Jira, Prometheus, caches like Redis/Memcached, task queues like celery, to name a few.
• Knowledge of test driven development and AWS tech stack will be a good plus.

Strong proficiency in node.js and frameworks available for it such as Express.js

Strong proficiency in JavaScript and Typescript

Strong problem-solving skills with a good understanding  of data structures algorithms

Hands-on experience and good knowledge of AWS services

Zeal and drive to take end-to-end ownership

• 2+ years of experience participating in the delivery of technology services.
• A proven ability to learn new applications & innovate in technology
• Strong Experience in technologies like Node, Webservices and Microservices
• Experience with cloud components and services and containerization technologies is desirable
• Exposure to ReactJS desirable
• Experience working with multiple types of datastores: Mongo DB, SQL
• Experience in integrating, designing and developing solutions is desirable
• Experience with CI/CD and TDD is desirable
• Frameworks - Express , Hapi , feathers
• Strong knowledge in Javascript