Ravindra K.-Senior Data Engineer | Azure · Databricks · PySpark · Delta Lake
Check rate
Experience
Data Engineer (Team Lead)
OPTUM – UnitedHealth Group
- Lakehouse build: Designed and built the member & eligibility domain of an Azure Databricks healthcare lakehouse, ingesting SQL Server, file and REST/SFTP sources (JSON, CSV, XML, Parquet) via Azure Data Factory into ADLS Gen2.
- Medallion pipelines: Transformed data through bronze, silver and gold Delta Lake layers with PySpark and Spark SQL; used Delta Live Tables / Lakeflow with built-in expectations for declarative, quality-checked pipelines.
- Platform modernisation: Delivered a SQL Server-to-cloud platform: ADF → ADLS Gen2 → Databricks → dbt Core models → Snowflake → Power BI, replacing legacy reporting with governed analytics.
- Robust ETL: Built metadata-driven, idempotent full, incremental and watermark-driven loads with schema evolution and failure-state handling, improving reliability and re-runnability.
- Data modelling: Designed Kimball star schemas with SCD Type 1 & 2 dimensions; tuned slow queries and pipelines using execution plans.
- Governance & security: Applied Unity Catalog RBAC, lineage and audit logging, with Azure Key Vault secrets and managed identities, to meet HIPAA and GDPR requirements.
- Leadership & mentoring: Led a 6-person team (2 data engineers, 2 analysts, BI developer, QA); mentored engineers, set delivery standards and coordinated with international stakeholders.
- Delivery & AI-assisted work: Ran CI/CD and work tracking in Azure DevOps; built Power BI semantic models with DAX and RLS; used Genie Code, Claude and Copilot to accelerate PySpark/SQL development, DAX and documentation.
Data QA Engineer
OPTUM – UnitedHealth Group
- Owned test strategy and execution for ETL and data warehouse loads as QA/Test Lead, covering source-to-target reconciliation, data validation and UAT support.
- Validated pipelines built in Informatica, SSIS and DataStage with SQL-based checks, building the data quality foundation later carried into engineering work.
Software Engineer – ETL & Data
Tech Mahindra
- Developed and tested ETL and data solutions for banking, insurance and financial services clients using SQL and Informatica / Talend.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Banking and Finance, Insurance, Healthcare, and Information Technology.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Business Intelligence, Quality Assurance, and Product Development.
Summary
Senior Data Engineer with 12+ years of experience in data engineering and data quality, including 8 years designing and building pipelines and lakehouse architectures on Azure and Databricks. Built production medallion lakehouses with PySpark, Delta Lake, Azure Data Factory, Synapse and ADLS Gen2 for UnitedHealth Group (OPTUM), working with international, distributed teams. Led and mentored a 6-person team of engineers, analysts and QA, and enjoy helping new teams grow from the ground up. Databricks Certified Data Engineer Associate and Microsoft Certified Fabric Data Engineer (DP-700).
Skills
- Azure & Databricks: Azure Databricks, Delta Lake, Delta Live Tables / Lakeflow Declarative Pipelines, Unity Catalog, Azure Data Factory, Azure Synapse (Serverless Sql), Adls Gen2 / Azure Storage, Azure Key Vault, Microsoft Fabric
- Languages: Python, Pyspark, Sql (T-Sql, Spark Sql), Stored Procedures
- Data Modelling & Architecture: Medallion Architecture, Data Lakes / Lakehouse, Kimball Star Schemas (Scd Type 1 & 2), Data Vault, 3nf, Metadata-Driven Etl
- Transformation & Orchestration: Dbt Core, Apache Airflow, Adf Pipelines, Incremental / Watermark Loads, Schema Evolution, Idempotent Design
- Data Quality & Governance: Great Expectations, Pytest, Dlt Expectations, Unity Catalog Rbac & Lineage, Gdpr / Hipaa, Data Contracts
- Devops: Azure Devops (Boards, Repos, Pipelines), Git / Github, Ci/Cd, Terraform, Docker
- Bi & Analytics: Power Bi (7+ Years), Dax, Row-Level Security, Excel
- Ai & Other: Databricks Genie Code, Claude, Github Copilot, Mlflow; Snowflake, Aws (S3, Glue, Athena), Kafka, Postgresql
Languages
Education
JNTU
B.Tech · Electrical and Electronics Engineering · India
Certifications & licenses
Microsoft Certified: Fabric Data Engineer Associate (DP-700)
GenRocket Synthetic Data Specialist
Statistics
Experience
Expertise
Qualifications
Frequently asked questions
Have questions? Find more information here.
Ravindra is based in Cologne, Germany and can operate in on-site, hybrid, and remote work models.
Ravindra speaks the following languages: English (Native), German (Elementary).
Ravindra has at least 17 years of experience. During this time, Ravindra has worked in at least 3 different roles and for 2 different companies. The average length of individual experience is 6 years and 7 months. Note that Ravindra may not have shared all experience and actually has more experience.
Based on recent experience, Ravindra would be well-suited for roles such as: Data Engineer (Team Lead), Data QA Engineer, Software Engineer – ETL & Data.
Ravindra's most recent position is Data Engineer (Team Lead) at OPTUM – UnitedHealth Group.
In recent years, Ravindra has worked for OPTUM – UnitedHealth Group.
Ravindra is most experienced in industries like Banking and Finance, Insurance, and Healthcare. Ravindra also has some experience in Information Technology.
Ravindra is most experienced in business areas like Information Technology, Business Intelligence, and Quality Assurance. Ravindra also has some experience in Product Development.
Ravindra has recently worked in industries like Banking and Finance, Healthcare, and Insurance.
Ravindra has recently worked in business areas like Business Intelligence and Information Technology.
Ravindra holds a Bachelor in Electrical and Electronics Engineering from JNTU.
Ravindra has 4 certificates. Among them, these include: Databricks Certified Data Engineer Associate, Microsoft Certified: Fabric Data Engineer Associate (DP-700), and Microsoft Azure Fundamentals (AZ-900).
Ravindra is immediately available full-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 2 Nov 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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