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Dean BonsuDB

Dean Bonsu

Senior Data & BI Developer

£350/day
Derby, GB
3-7 years

Average response time: 1 hour

About Dean

I am a data Engineer & Analytics Developer with 6+ years’ experience building data-driven systems and intelligent analytics platforms. Skilled across the full data lifecycle—from ETL pipelines and warehousing to predictive modeling and AI automation. Experienced in applying machine learning, computer vision, and generative AI to solve real business problems.
Proficient in Python (TensorFlow, Scikit-learn, Pandas), SQL (PL/SQL), and BI tools (Power BI, Jaspersoft, Tableau). Hands-on with Generative AI models including OpenAI Codex, Anthropic Claude, Gemini, and open-source LLMs via Retrieval-Augmented Generation (RAG) for internal data reference and summarization. Passionate about building intelligent, automated data ecosystems that enhance business performance and decision-making.
  • English

    Native or bilingual

  • Italian

    Native or bilingual

Can work on-site
Derby (up to 50km)

Experience

  • NEC Software Solutions (Housing Division)
    Senior Data & BI Developer
    August 2022 - Today (3 years and 10 months)
    • Architected and delivered automated BI and data engineering solutions using Power BI, Jaspersoft, and Oracle SQL to serve large UK housing clients.
    • Developed end-to-end ETL pipelines in WhereScape RED and PL/SQL to transform operational data into a centralized warehouse supporting analytics and product reporting.
    • Designed and deployed a CNN-based computer vision model to classify and score mould severity in property images using TensorFlow, improving maintenance prioritization.
    • Built RAG-enabled AI assistants using open-source LLMs and local vector databases to retrieve and summarize internal application data for customer support and documentation.
    • Integrated Generative AI tools (Codex, Claude, Gemini) into development workflows to accelerate report generation, data cleaning, and API documentation.
    • Applied prompt engineering to optimize LLM accuracy and reduce hallucination in AI assisted analytics tasks.
    • Collaborated with the Business Insights and Product teams to design scalable data structures supporting analytics and application-level performance.
    • Mentored junior analysts and contributed to technical documentation and release planning within Agile sprints.
    PowerBI PL/SQL Python Data analysis Data science
  • Metropolitan Thames Valley Housing (Planned Investment & Data Team)
    Data Analyst / BI Developer
    October 2020 - August 2022 (1 year and 10 months)
    • Developed data automation pipelines and Power BI dashboards to monitor investment works, asset condition, and compliance.
    • Reduced manual reporting effort by 90% through SQL automation and VBA scripting.
    • Designed data quality frameworks to clean and validate stock and project data, improving integrity for regulatory reporting.
    • Partnered with finance and operations teams to model investment scenarios and assess ROI using predictive techniques.
  • Metropolitan Thames Valley Housing (Compliance & Technical Services)
    Technical Data Assistant
    October 2018 - October 2020 (2 years)
    • Created and maintained Power BI dashboards to visualize performance and compliance KPIs in real time.
    • Developed SQL-driven reporting for contract performance and technical services, ensuring data alignment with regulatory standards.
    • Streamlined data collection processes, reducing turnaround for compliance reports by 70%.

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Education

  • MSc
    University of Portsmouth
    2023
    MSc
  • BA
    Nottingham Trent University
    2018
    BA

Skill set

Categories