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Justin Roberts

@justinroberts

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Senior full-stack software engineer building scalable SaaS and cloud platforms with modern JavaScript and AI.

United States

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What I'm looking for

I’m looking for a role building scalable SaaS and cloud platforms end-to-end—focused on clean architecture, reliable DevOps pipelines, and high-performance systems. I’m especially excited to ship AI/LLM-powered features using modern web stacks.

I’m a Senior Full-stack Software Engineer with 10+ years of experience building scalable SaaS and cloud-based web applications. I’m known for delivering high-performance platforms with clean architecture, reliable DevOps pipelines, and a strong end-to-end focus.

On the backend, I specialize in Node.js, NestJS, Express, FastAPI, Django, and Ruby on Rails. I design microservices and event-driven architectures using Kafka, RabbitMQ, and PostgreSQL, then deploy cloud-native systems on AWS with Docker, Kubernetes, and Terraform.

I also build intelligent, data-driven features by integrating AI/ML workflows with OpenAI, LangChain, and TensorFlow.js. In practice, I’ve orchestrated LLM/ML workflows for automation use cases and integrated them directly into SaaS experiences where reliability and throughput matter.

Across my roles, I’ve improved system stability by diagnosing production bottlenecks and resolving defects, implemented monitoring with Grafana and Prometheus, and increased maintainability through refactoring microservices and database schemas. I’m at my best partnering with product and engineering teams to ship, scale, and continuously strengthen platforms.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Salesforce

May 2024 - Present (2 years)

Delivered cloud-native features for a SaaS platform, improving automation capabilities and system stability across frontend and distributed backend services. Implemented monitoring and AI-powered workflows to automate LLM/ML-driven tasks, and refactored microservices for better maintainability.

Angular fastAPI Next.js NestJS Docker AWS DynamoDB Grafana Prometheus OpenAI API

Full Stack Engineer

Block

Feb 2021 - Apr 2024 (3 years 2 months)

Built data visualization and decision intelligence components, and designed microservices to improve scalability and efficiency. Integrated Salesforce APIs for account synchronization, delivered responsive cross-device UX, and supported distributed system patterns.

Vue.Js D3.Js Ruby on Rails PostgreSQL Kafka RabbitMQ Microservices Salesforce API Responsive UI Distributed Systems

Software Developer

Pardot

Nov 2015 - Jan 2021 (5 years 2 months)

Developed and hardened user-facing features and internal batch/MQ-driven processes for a large enterprise web app. Shepherded Ruby on Rails practices, tuned infrastructure for ROI and stability, built cross-stack features (Django/React/MongoDB), and supported cloud deployment and database migrations.

Ruby on Rails Django React MongoDB CI CD Infrastructure Monitoring Google Cloud Platform API Development

Software Developer

CareerBuilder

Dec 2012 - Oct 2015 (2 years 10 months)

Enabled multi-language integrations by building C++ abstraction layers with Python and Java bindings, and ported OpenGL workloads to OpenGL ES on embedded hardware. Improved reliability through automated unit testing/CI, added 24/7 monitoring, modernized the frontend by replacing jQuery with a custom JavaScript SPA framework, and addressed cross-platform migration issues.

C#Python Java Unit Testing CI CD Infrastructure Monitoring JavaScript SPA