Constantin Lungu
Verified Expert in Engineering
Data Analytics, BI, and Database Developer
Bucharest, Romania
Toptal member since February 18, 2021
Constantin is a data analytics professional with a track record across eCommerce, digital, and finance. He helps teams understand their data and extract valuable insights from it. Constantin is an AWS Certified Developer, an AWS Certified Cloud Practitioner, and has a strong background in cybernetics and statistics. He has built analytics applications, data pipelines, BI and DW projects, and delivered end-to-end data products, including the extraction, transformation, and presentation of data.
Portfolio
Experience
- Business Intelligence (BI) - 6 years
- SQL Server Analysis Services (SSAS) - 5 years
- Python - 5 years
- SQL Server Integration Services (SSIS) - 5 years
- SQL Server 2016 - 5 years
- SQL Server Reporting Services (SSRS) - 4 years
- Google BigQuery - 3 years
- Apache Airflow - 2 years
Availability
Preferred Environment
Linux, PyCharm, Visual Studio Code (VS Code)
The most amazing...
...project I've worked on is an environment that integrated 30+ data sources into an analytics product catering to hundreds of specialized individuals.
Work Experience
Data Engineer
Freelance
- Created, maintained, and troubleshot data infrastructure on Google Cloud Platform using languages and frameworks such as Python, Scala (Spark), SQL, Dataform, and DevOps tools such as GitLab CI, Github Actions, and Terraform.
- Maintained and extended data warehouse functionality.
- Delivered reporting suites and operational reporting and notifications used in key business areas.
- Gathered functional and technical requirements to incorporate into the product backlog.
Software Engineer
Electronic Arts
- Built, extended, and maintained data pipelines using C#, SQL Server, and SSIS using an in-house ETL framework.
- Built analytics applications using the Microsoft BI stack (SSRS, SSIS, SSAS) and Power BI catering to a large audience of data analysts, project managers, and QA specialists.
- Extracted, transformed, and loaded data from several dozen sources on different relational platforms.
BI Development Engineer
ING Group
- Delivered end-to-end data products, including extraction, transformation, loading, and presentation of data.
- Developed, extended, and maintained the BI reporting suite.
- Developed functionality for the data warehouse environment.
BI Developer
The Hut.com
- Integrated data using various tools such as Python, C#, R, AWS (Amazon Redshift and S3), and GCP (BigQuery).
- Developed and maintained BI reporting used by marketing, sales, fulfillment, and other functions.
- Built self-service web applications using ASP.NET.
BI Developer
Senior Software Agency SRL
- Developed BI and corporate performance management applications using SQL Server, SSRS, and Board.
- Extracted, transformed, and loaded data from client systems (operational systems and databases).
- Collaborated with clients at project meetings and collected requirements.
Experience
Exploring Twitter Data Using Python
https://medium.com/@cnstlunguEducation
Master's Degree in Cybernetics, Statistics and IT Applied in Economics
ASE Bucharest - Bucharest, Romania
Bachelor's Degree in Finance, Insurance, Banking and Stock Exchange
ASE Bucharest - Bucharest, Romania
Erasmus Exchange Program in Economics
Université d'Orléans - Orleans, France
Certifications
AWS Certified Data Analytics - Specialty
Amazon Web Services
Google Cloud Certified Professional Data Engineer
Google Cloud
AWS Certified Developer - Associate
Amazon Web Services
AWS Certified Cloud Practitioner
Amazon Web Services
Skills
Libraries/APIs
Pandas
Tools
BigQuery, Apache Airflow, Microsoft Power BI, TeamCity, GitLab, GitLab CI/CD, Tableau, PyCharm, Terraform
Languages
SQL, Python, C#
Paradigms
Business Intelligence (BI), ETL
Storage
SQL Server 2016, SQL Server Integration Services (SSIS), SQL Server Analysis Services (SSAS), PostgreSQL, Databases, Data Lakes, SQL Server Reporting Services (SSRS), SQL Server 2014, Redshift, Google Cloud
Platforms
Google Cloud Platform (GCP), Linux, Visual Studio Code (VS Code), Amazon Web Services (AWS)
Other
Data Engineering, Google BigQuery, Data Warehouse Design, APIs, RESTful Microservices, Data Visualization, Modeling, Data Modeling, Data Build Tool (dbt), Looker Studio, Octopus Deploy, Quantitative Analysis, Data Analysis, Boards, Natural Language Processing (NLP), Analytics, Generative Pre-trained Transformers (GPT)
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