Radu-Mihai Rotariu
Summary
Results-driven Business Intelligence and Data Analyst with over 5 years of experience with a proven ability to translate complex datasets into clear, actionable insights for senior stakeholders using SQL, Python, Tableau and Power BI, delivering high-impact insights across various industries such as banking, retail, consultancy, as well as the public-sector environments.
Experienced in working end-to-end—from data preparation and modelling to visualisation and executive-level reporting. Strong communicator with a disciplined work ethic, demonstrated by successfully balancing full-time work alongside full-time postgraduate study.
Overview
6
6
years of professional experience
4
4
years of post-secondary education
Work history
Business Intelligence Analyst
Hampshire Trust Bank
London
07.2023 - Current
- Identified trends for the Finance department to assist with their strategic planning using advanced SQL queries within Snowflake and SQL Server, consequently helping the bank achieve a 19% increase in operating income
- Utilised Python for data validation, transformation, predictive modelling and report automation (saving 80% of the time previously spent on manual reporting)
- Designed and delivered Tableau and Power BI dashboards used by senior stakeholders for portfolio monitoring and risk assessment in various departments across the bank
- Designed and automated reports using Tableau and Power BI, significantly reducing manual tasks.
- Conducted regular audits on the database performance and data quality issues; ensured optimised operation at all times.
- Spearheaded comprehensive reviews of existing BI strategy; recommended significant improvements based on findings.
- Performance-tuned and troubleshooted reporting and BI tools, systems and software.
- Executed successful migration of all BI systems to new platforms.
- Championed the move towards cloud-based analytics platforms; improved remote access capability substantially.
- Researched and analysed the impact of existing reporting procedures to identify improvements.
- Developed training materials for staff on the use of BI software tools.
Senior Data Analyst
Marks & Spencer
London
09.2022 - 07.2023
- Led the development of space and performance analytics supporting strategic decisions across the M&S estate on the Clothing & Home-related products, helping increase sales by 11.5%
- Delivered executive-ready reports using SQL (Oracle and PostgreSQL), Power BI, Excel, and Python
- Defined data requirements and KPIs in collaboration with senior leaders
- Built scalable reporting solutions that improved clarity, consistency, and decision-making speed
- Acted as a senior analytical point of contact, ensuring high-quality outputs under tight deadlines
Data Analyst
Tata Consultancy Services
London
06.2020 - 09.2022
- Delivered analytical solutions for clients across retail, charity, and cybersecurity sectors
- Conducted customer profiling, online order analysis, engagement measurement, and A/B test evaluation
- Built dashboards and reports using Python, SQL, Tableau, AWS, and Snowflake
- Worked directly with stakeholders to translate business questions into analytical outputs
- Ensured data accuracy and usability through rigorous data cleaning and validation processes
Data Science Intern
Richmond and Wandsworth Councils
London
02.2020 - 05.2020
- Contributed to a population churn data science project alongside a team of professional data scientists
- Performed data analysis and preparation using Python, SQL, and Excel
- Supported insight generation for public-sector planning and decision-making
Education
Master of Science - Data Science
London South Bank University
London 09.2019 - 06.2020
Bachelor of Science - Criminology & Sociology
City University
London, England 09.2015 - 07.2018
Data Analytics
General Assembly
London 04.2019 - 06.2019
Skills
- SQL
- Python
- R
- Tableau
- Power BI
- Microsoft Excel
- Machine learning
- Data Visualization
- Data Modelling
- Data Mining
Languages:
- Romanian (native)
- English (fluent)
- German (fluent)
Languages
Romanian
Native
English
Fluent
German
Advanced
Timeline
Business Intelligence Analyst
Hampshire Trust Bank
07.2023 - Current
Senior Data Analyst
Marks & Spencer
09.2022 - 07.2023
Data Analyst
Tata Consultancy Services
06.2020 - 09.2022
Data Science Intern
Richmond and Wandsworth Councils
02.2020 - 05.2020
Master of Science - Data Science
London South Bank University
09.2019 - 06.2020
Data Analytics
General Assembly
04.2019 - 06.2019
Bachelor of Science - Criminology & Sociology
City University
09.2015 - 07.2018