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Data Preprocessing Jobs in California (NOW HIRING)

AI Engineet

San Jose, CA · On-site

$134K - $161K/yr

The role involves researching and prototyping advanced RAG techniques, implementing Agentic AI patterns, and collaborating on data preprocessing pipelines. Responsibilities : • Research and ...

AI/ML Engineer

Aliso Viejo, CA · On-site

$52 - $57/hr

Data Preprocessing & Feature Engineering - 3+ years. * Model Evaluation Techniques - 3+ years. * Version Control (Git) - 2+ years. * ML Lifecycle / Model Management - 2+ years. Responsibilities:

ML Engineer

Aliso Viejo, CA · On-site

$47 - $52/hr

Experience with feature engineering, data preprocessing, and data manipulation libraries (Pandas, NumPy, Spark). * Demonstrated experience building or working with ranking models (learning-to-rank ...

Experiencewith data preprocessing, feature engineering, and model evaluationtechniques. * Knowledgeof deep learning architectures (CNNs, RNNs, Transformers) and theirapplications. * Proficiencyin ...

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Data Preprocessing information

What is data preprocessing?

Data preprocessing is the process of cleaning, transforming, and organizing raw data into a usable format for analysis or machine learning. It involves steps such as handling missing values, removing duplicates, normalizing or scaling data, and encoding categorical variables. Proper data preprocessing helps improve the quality and performance of predictive models by ensuring the data is accurate, consistent, and suitable for analysis.

What are the key skills and qualifications needed to thrive as a data preprocessing specialist, and why are they important?

To thrive as a Data Preprocessing Specialist, you need a strong background in statistics, data cleaning, and data transformation, often supported by a degree in computer science, data science, or a related field. Proficiency with tools such as Python (pandas, NumPy), SQL, and data visualization platforms is typically essential, along with familiarity with data management systems. Attention to detail, problem-solving abilities, and effective communication are standout soft skills in this position. These skills are crucial for ensuring high-quality, reliable datasets that underpin accurate data analysis and machine learning outcomes.

What are some common challenges faced in a data preprocessing role, and how can they be effectively managed?

Professionals in Data Preprocessing often encounter challenges such as handling incomplete or inconsistent data, managing large datasets, and ensuring data quality before analysis. Addressing these issues typically involves using specialized tools to automate data cleaning, establishing clear data validation rules, and collaborating closely with data engineers and analysts. Staying updated with best practices and leveraging scripting languages like Python or R can also streamline the preprocessing workflow, making it easier to deliver reliable and accurate datasets for downstream analysis.

What is the difference between Data Preprocessing vs Data Analysis?

AspectData PreprocessingData Analysis
Primary FocusCleaning, transforming, and preparing raw data for analysisInterpreting data to extract insights and support decision-making
Skills RequiredData cleaning, scripting, understanding of data formatsStatistical analysis, data visualization, critical thinking
Work EnvironmentData engineering teams, data science projectsBusiness intelligence, research, data science teams
Tools UsedPython, R, SQL, ETL toolsExcel, Tableau, R, Python, statistical software

While data preprocessing involves preparing raw data for analysis by cleaning and transforming it, data analysis focuses on interpreting the prepared data to uncover trends and insights. Both roles are essential in the data pipeline but serve different purposes in the data lifecycle.

What are popular job titles related to Data Preprocessing jobs in California?

For Data Preprocessing jobs in California, the most frequently searched job titles are:

What cities in California are hiring for Data Preprocessing jobs?

Cities in California with the most Data Preprocessing job openings:

Infographic showing various Data Preprocessing job openings in California as of June 2026, with employment types broken down into 42% Internship, and 58% Full Time. Highlights an 100% In-person job distribution.

$134K - $161K/yr

Full-time

Re-posted 23 days ago


Job description

Job Summary:
Spark Tek Inc is seeking an AI Engineer to work on advanced AI techniques and optimize AI workflows. The role involves researching and prototyping advanced RAG techniques, implementing Agentic AI patterns, and collaborating on data preprocessing pipelines.
Responsibilities:
• Research and prototype Advanced RAG techniques (e.g., chunking strategies, retrieval optimization, knowledge graph integration).
• Explore and implement Agentic AI patterns (e.g., supervisor vs plan-execute workflows).
• Investigate and develop methods for reducing memory footprint and improving LLM response quality.
• Design and experiment with LLM fine-tuning strategies for domain-specific applications.
• Collaborate on data preprocessing pipelines, including SQL-based processing and advanced text preprocessing techniques.
• Leverage LangChain ecosystem tools: LangChain, LangGraph, LangSmith for building and evaluating AI workflows.
• Experiment with LLMs such as GPT-4+, Gemini, LLaMA, and others for various use cases.
• Apply design patterns in AI and backend development for scalability and maintainability.
• Contribute to ML Ops and LLM Ops best practices to streamline research-to-production pipelines.
Qualifications:
Required:
• Deep expertise in Python, asynchronous programming, and software design patterns.
• Strong SQL skills, data preprocessing, and transformation techniques.
• Hands-on experience with LangChain, LangGraph, and LangSmith.
• Familiarity with leading models like GPT-4+, Gemini, LLaMA.
• Agentic AI patterns.
• Advanced RAG methods.
• LLM fine-tuning approaches.
• ML Ops & LLM Ops workflows.
Preferred:
• AWS or GCP experience.
• CI/CD and containerized environment familiarity.
Company:
Spark Tek Inc offers IT solutions and consultancy services, specializing in IT services and consulting for various industries. Founded in 2021, the company is headquartered in Farmers Branch, USA, with a team of 51-200 employees. The company is currently Growth Stage.