Principal Software Engineer

Overview

Job Description

Principal Software Engineer

Company: Zoom Info Technologies LLC
Location: Waltham, MA
On-site, Remote: On-site, Remote
Salary: $145.60K - $195.30K/yr
Team: Applied AI
Level: Principal

• Design and build distributed systems that process, enrich, and respond to billions of behavioral events per day in real time
• Develop high-performance APIs and services that support advertising, identity, and intent features across the Marketing Platform
• Leverage machine learning and large language models (LLMs) to analyze behavioral data, classify content, extract signals, and enable intelligent decision-making
• Build intelligent agents using frameworks like Lang Graph or MCP to reason over data and power user-facing insights
• Design and operate data pipelines using tools like Kafka, Kinesis, and Click House to support both streaming and batch workloads
• Drive quality, performance, scalability, and observability across all systems you own
• Collaborate cross-functionally with product managers, data scientists, and engineers to deliver customer-facing features and internal tooling
• Contribute to technical leadership and mentorship of teammates

• 5+ years of backend, data, or infrastructure engineering experience, or equivalent impact and leadership.
• Strong experience in at least one of the following:
• Distributed systems engineering (e.g., building low latency/high throughput APIs, scalable microservices, event processing pipelines)
• Big data infrastructure (e.g., streaming, warehousing, low-latency storage at scale)
• Applied AI/ML, including use of LLMs for extraction, classification, or reasoning tasks
• Proficiency in one or more core languages:
  Java, Go, Python
• Solid grasp of SQL and large-scale data modeling
• Familiarity with databases and tools such as:
  Click House, Dynamo
  
  DB, Bigtable, Memcached, Kafka, Kinesis, Firehose, Airflow, Snowflake

• Comfortable using LLMs as part of your development workflow-whether via tools like Copilot, Cursor, ChatGPT, Claude, or others-to boost productivity, explore architecture ideas, and rapidly prototype.
• Skilled at designing and implementing LLM-powered systems such as RAG pipelines, agent frameworks (e.g., Lang Graph), or intelligent workflows that reason across large datasets in real time.

• Experience in ad tech, real-time bidding (RTB), or programmatic systems
• Background in identity resolution, attribution, or behavioral analytics at scale
• Contributions to open source in ML, infrastructure, or data tooling
• Strong product instincts and a passion for building tools that drive meaningful outcomes

About the company

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