Open to opportunities

Justin Lee

@justinlee6

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Experienced backend-focused full stack engineer specializing in Go and Node.js.

United States

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What I'm looking for

I'm looking for a role that fosters innovation, collaboration, and growth in AI and backend technologies.

I'm a Senior Software Engineer with a strong focus on backend development, specializing in Go, Node.js, and Python. My expertise lies in building scalable microservices and real-time data pipelines, particularly in AI-powered systems that integrate large language models (LLMs). At Hex, I've successfully contributed to AI Forecasting Templates, developing backend services that support time-series forecasting and analytics. My work has led to a 20% improvement in the accuracy of AI features through collaboration with data science teams.

Previously, at Segment, I played a pivotal role in building core backend services for real-time customer data enrichment. I developed high-throughput event ingestion pipelines and migrated legacy systems to containerized microservices, enhancing system reliability and performance. My passion for mentoring junior developers and leading architectural reviews has fostered a culture of continuous learning and improvement within my teams.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Hex

Nov 2022 - Present (2 years 8 months)

Contributed to AI Forecasting Templates, building backend services in Go and Node.js to support time-series forecasting and LLM-powered analytics. Led integration of LLMs using Python, PyTorch, and LangChain, enabling dynamic forecasting and AI-assisted insights across datasets.

Go)Node Python PyTorch Lang Chain LLM Integrations Kafka MongoDB Elasticsearch BigQuery fastAPI Docker Prometheus Grafana React TypeScript Figma

Software Engineer

Segment

Aug 2017 - Aug 2021 (4 years)

Worked on Segment Personas, building core backend services in Go and Node.js to handle real-time customer data enrichment and profile generation. Developed high-throughput event ingestion pipelines using Kafka, AWS Lambda, and S3, scaling to billions of events per day.

Go)Node Kafka AWS Lambda S3 PostgreSQL Redis Snowflake Docker AWS ECS Terraform GraphQL REST OAUTH2 JWT IAM React Next.js GitHub Actions CodeBuild Datadog)

Education

Degrees, certifications, and relevant coursework

Dartmouth College

Bachelor of Arts, Computer Science

Studied Computer Science at Dartmouth College, gaining foundational knowledge in the field. Completed coursework and projects relevant to modern software development practices.