Data Engineering Lead

Hark; San Jose (CA); On-site; USD 170,000 - 450,000; Full time

Job summary

Hark, located in San Jose, California, is looking for a skilled data engineer to build data infrastructure for advanced AI systems. In this high-responsibility role, you will design scalable data pipelines, own the data engineering stack, and collaborate with teams to ensure the integrity of training data.

The ideal candidate will have over 5 years of experience, a solid understanding of machine learning data systems, and excellent communication skills. The position offers a competitive salary and the opportunity to work at the forefront of AI innovation.

Qualifications

• 5+ years of relevant data engineering experience.
• Experience at a fast‑growing AI or research‑driven company is a strong plus.
• Familiarity with multimodal data formats and processing pipelines.

Responsibilities

• Design and build scalable data pipelines for training data.
• Own the data infrastructure stack: ingestion to delivery.
• Collaborate with model researchers on data requirements.
• Build tooling for data quality inspection.
• Define and enforce data quality standards.
• Design data systems for reproducibility and scale.
• Drive improvements to throughput, quality, and reliability.

Skills

Data engineering fundamentals

Data systems for machine learning

Modern data stack

Systems thinking

Quality instinct

Strong communication

Tools

Spark

Beam

Flink

DVC

Delta Lake

Iceberg

Job description

About Hark

Hark is an artificial intelligence company building advanced, personalized intelligence. One that is proactive, multimodal, and capable of interacting with the world through speech, text, vision, and persistent memory.

We're pairing that intelligence with next-generation hardware to create a universal interface between humans and machines. While today's AI largely operates through chat boxes and decade-old devices, Hark is focused on what comes next: agentic systems that interact naturally with people and the real world.

To get there, we're developing multimodal models and next-generation AI hardware together - designed from the ground up as a single, unified interface for a new era of intelligent systems.

About the Role

You’ll build the data infrastructure that turns raw signals into the training data Hark's models learn from, and the pipelines that keep it flowing at scale.

That means owning the full data engineering stack: ingestion, transformation, quality filtering, and delivery to training and evaluation systems. The models we ship are only as good as the data behind them, and this role owns that foundation.

This is a high‑ownership role on a small team. You'll work directly with model researchers, data collection leads, and infrastructure engineers, and the systems you build will directly shape the quality and pace of model development.

Responsibilities

• Design and build scalable data pipelines that ingest, process, and deliver training data across multiple modalities: text, audio, vision, and structured feedback signals.
• Own the data infrastructure stack end‑to‑end: ingestion, transformation, deduplication, quality filtering, versioning, and delivery to model training and evaluation systems.
• Collaborate closely with model researchers and data collection leads to understand data requirements and translate them into reliable, auditable pipelines.
• Build tooling and frameworks that make it easy for the team to inspect, evaluate, and iterate on data quality. The insights surfaced should feed back into collection and curation decisions.
• Define and enforce data quality standards. Instrument pipelines for correctness, freshness, and coverage. Catch regressions before they reach training.
• Design data systems for reproducibility and scale. The pipelines you build need to handle growing volumes across modalities without becoming a bottleneck.
• Identify gaps in the current stack and drive concrete improvements to throughput, quality, and reliability.

Requirements

• Strong data engineering fundamentals. You are comfortable designing and operating large‑scale batch and streaming pipelines, and you care about correctness and reliability.
• Experience building data systems for machine learning. You understand the difference between a data pipeline for analytics and one that feeds model training, and you know what it takes to get the latter right.
• Fluency with the modern data stack. You've worked with tools like Spark, Beam, or Flink, and you know how to make tradeoffs between them. Experience with data versioning systems (e.g., DVC, Delta Lake, Iceberg) is a strong plus.
• Systems thinking. You reason about schema evolution, backfills, and failure modes before they become production incidents. You build for the day‑2 case, not just the demo.
• A quality instinct. You don't just move data. You understand what's in it, catch problems early, and close the feedback loop with the people who need clean data.
• Strong communication. You can work closely with model researchers and engineers, explain data tradeoffs clearly, and make good decisions across team boundaries.
• 5+ years of relevant data engineering experience. Experience at a fast‑growing AI or research‑driven company is a strong plus.

Bonus Qualifications

• Experience building data infrastructure for large language model or multimodal model training.
• Familiarity with multimodal data formats and processing pipelines (audio, video, image).
• Experience with human feedback or preference data pipelines (RLHF, DPO, or similar).
• Hands‑on experience with data quality evaluation frameworks or annotation tooling.
• Background in distributed systems, stream processing, or large‑scale ETL.
• Experience at a fast‑moving AI lab or research‑driven company.

Compensation

The US base salary range for this full‑time position is between $170,000 - $450,000 annually.

The pay offered for this position may vary based on several individual factors, including job‑related knowledge, skills, and experience. The total compensation package may also include additional components/benefits depending on the specific role. This information will be shared if an employment offer is extended.