Ahmad Tayel
Verified Expert in Engineering
Data Analyst and Developer
Malaga, Spain
Toptal member since May 28, 2026
Ahmad is a senior data analyst with over 6 years of experience in fintech, payments, and growth analytics. His expertise spans BigQuery, dbt, Tableau, and Looker, with notable work at Tabby, Calo, Paymob, and Bypa-ss. He built onboarding dashboards to reduce ad-hoc requests and led initiatives, achieving up to 50% YoY revenue impact.
Portfolio
Experience
- SQL - 6 years
- Tableau - 6 years
- Looker - 6 years
- Python - 6 years
- A/B Testing - 6 years
- Looker Studio - 6 years
- Data Analytics - 6 years
- Microsoft Power BI Desktop - 6 years
Preferred Environment
BigQuery, Data Build Tool (dbt), Tableau, Redash, Looker, Elasticsearch
The most amazing...
...onboarding analytics I've owned cut ad-hoc requests across teams by building 10+ dashboards.
Work Experience
Senior Data Analyst
Tabby
- Owned merchant onboarding analytics end-to-end, partnering directly with product and operations leadership on global KYB, underwriting, and activation strategy.
- Designed scalable BigQuery and dbt data solutions, building 10+ onboarding dashboards and reusable datasets that cut ad-hoc requests across teams.
- Shaped onboarding strategy by instrumenting 25+ tracking events and defining SLAs/KPIs adopted across markets.
- Developed real-time anomaly detection for approval-rate drift, reducing intervention time by 40%.
- Defined the onboarding data ontology: canonical entities for merchant, application, credit decision, and activation, the relationships between them, and the property schemas and event taxonomy that the whole funnel is measured from.
- Built and governed the semantic layer behind an internal self-serve analytics tool, mapping that model onto BigQuery and dbt so non-technical teams get consistent metric answers in plain language.
- Contributed the merchant onboarding domain to the company-wide analytics semantic layer, packaging entity definitions, relationships, metrics, and reference queries so other teams can reuse one model instead of rebuilding it.
Senior Product Analyst
Insense Ads
- Mentored internal analysts and delivered deep insights into creator/client behavior across the creator marketplace.
- Built 15+ Tableau/Redash dashboards and shipped a custom GPT tool that cut ad-hoc analytics response time by 60%.
- Deployed a custom GPT tool that cut ad-hoc analytical response time by 60%.
Senior Business Analyst
Calo
- Led ambiguous AI-personalization analytics for 50,000+ users, owning scope and deliverables across product, data science, and ops.
- Translated model performance into business outcomes: over 12% matching accuracy, less than 23% swap rates, and over 12% retention.
- Built a menu-sizing simulation that saved $10 million annually by re-sizing meals while meeting user calorie targets.
Senior Data Analyst
Paymob
- Drove a 7% MoM success-rate uplift for online payments by leading a cross-functional unified checkout initiative.
- Lifted intention-to-pay conversion 16% through rigorous A/B testing with product managers and designers.
- Scaled decision-making across the organization by building real-time SQL/dbt/Looker reporting infrastructure.
Senior Product Analyst
Bypa-ss
- Pioneered analytics infrastructure on Tableau, Looker, and Elasticsearch, scaling the user base 10x to 200,000.
- Orchestrated A/B tests driving over 35% subscription growth.
- Delivered over 50% YoY revenue impact through SQL-driven customer insight.
Experience
Cross-channel Marketing Performance Dashboard (Looker Studio)
The scope of work included connector configuration and access management, calculated fields (ROAS, CAC, CVR, vs. Target) defined in-report so charts stay portable, and a multi-page layout (Executive Overview, Paid Media, Web Behavior, Pipeline, Targets). The funnel chart traces conversions from ad click to closed deal, so marketing and sales have the same view.
The solution was designed so that a non-technical marketing lead can interpret it without support. It includes pairs with a handoff document covering data sources, calculated field formulas, refresh schedule, and known quirks such as UTM drift and GA4 attribution lag. Sample data is shown for illustration.
Merchant Onboarding Analytics Platform (BigQuery and dbt)
The scope of work included instrumenting 25+ tracking events across the onboarding journey, defining the metric layer (approval rate, time to activation, stage drop-off, SLA breaches), and building 10+ dashboards for product, operations, and market leadership. Funnel and cohort views made stage-level drop-off comparable across markets and merchant segments.
Adoption was the design goal: self-serve dashboards plus documented definitions replaced most recurring ad hoc requests, and the same models fed into SLA monitoring and experiment readouts. Metric definitions, ownership, and refresh cadence were documented so that product, ops, and leadership could work from a single source of truth.
Creator Marketplace Analytics Suite with a GPT Self-serve Assistant
The scope of work included defining the core marketplace metrics (match rate, time to first collaboration, repeat collaboration rate, revenue per client cohort), running cohort and retention analyses to explain churn, and designing dashboards that non-technical account and sales teams could use directly in client conversations.
A custom GPT assistant was then built on top of the documented metric definitions and schema, so stakeholders could ask routine questions in plain language and get back the right query, dashboard link, or definition. Ad-hoc analytics response time dropped by roughly 60%, which shifted analyst time toward deeper investigations. The engagement also included mentoring internal analysts on SQL and dashboard design standards.
AI Meal Personalization Analytics and Menu-sizing Simulation
The scope of work included defining the evaluation metrics for personalization quality (matching accuracy, meal swap rate, cohort retention), building reports that tracked them week over week, and running analyses to explain why specific user segments swapped meals or churned. Model performance was reported in terms of business impact rather than offline scores: matching accuracy improved by over 12%, swap rates were held below 23%, and retention improved by over 12%.
A separate menu-sizing simulation modeled portion and ingredient sizing against user calorie targets and unit economics, so scenarios could be tested before any kitchen change was committed. The adopted scenario saved roughly $10 million annually while maintaining nutritional targets.
Unified Checkout Analytics and Payment Success-rate Program
The scope of work included defining the success-rate metric consistently across teams, sizing each failure bucket, and prioritizing fixes with product and engineering. Alongside it, structured A/B testing with product managers and designers covered checkout copy, layout, and payment-method ordering, measured on intention to pay through to completed payment.
The reporting infrastructure was rebuilt on SQL and dbt models that feed Looker, so merchant and executive dashboards now run on shared, tested definitions instead of one-off extracts. Outcomes included a 7% month-over-month uplift in the payment success rate and a 16% lift in the intention-to-pay conversion rate.
Healthcare Platform Analytics Foundation (Tableau, Looker, Elasticsearch)
The scope of work included designing the event taxonomy and core metric definitions (activation, subscription conversion, cohort retention, revenue per user), building dashboards that enabled self-service, and establishing querying patterns that kept reporting responsive as data volume grew.
On that foundation, a structured experimentation program covered onboarding, subscription paywalls, and pricing presentation, with results read on cohort retention rather than click-through alone. The program contributed over 35% subscription growth, and SQL-driven customer insight work, including segmentation and churn analysis, supported over 50% year-over-year revenue impact.
Education
Master's Degree in Data Science and AI
University of Liverpool - Online
Bachelor's Degree in Mechatronics Engineering
German University In Cairo - Cairo, Egypt
Certifications
Claude Certified Architect - Foundations
Anthropic
A/B Testing in Python
DataCamp
Data Product Manager
Udacity
Product-led Growth Micro-certification (PLGC)
Product School
Product Analytics Micro-certification (PAC)
Product School
SQL Advanced
HackerRank
Python
HackerRank
Data Analysis Track
Udacity
Google Analytics Certification
Modern Big Data Analysis with SQL Specialization
Coursera
IBM Data Analytics with Excel and R Specialization
Coursera
IBM Data Analyst Specialization
Coursera
Google Data Analytics Specialization
Coursera
Skills
Libraries/APIs
PySpark, Pandas, React, REST APIs, SOAP APIs, Power BI REST APIs, NumPy, Scikit-learn, Matplotlib
Tools
BigQuery, Tableau, Redash, Looker, Microsoft Power BI, Claude Code, Codex, Apache Airflow, Power Query, Microsoft Copilot, Microsoft Excel, AWS Glue, Pytest, Git, Sentry, Microsoft Power Apps, Grafana, Google Sheets, Autodesk, Terraform, Microsoft Access, GIS, Consent Management Platforms, n8n, Domo, Apache Iceberg, Superset, Acumatica, Power BI Desktop, Visual Studio, Claude, GitLab, Google Analytics, Plotly, Jira, Confluence
Languages
SQL, Python, Snowflake, Java, R, Excel VBA, RDF, SPARQL, Looker Modeling Language (LookML)
Frameworks
Spark, Apache Spark, Data Lakehouse, Streamlit, QCubed, Ontology Framework
Paradigms
ETL, Business Intelligence (BI), Role-based Access Control (RBAC), Dimensional Modeling, Test-driven Development (TDD), Conversion Rate Optimization (CRO), Anomaly Detection, Fast Healthcare Interoperability Resources (FHIR), Database Design, Automation, HIPAA Compliance, Model Context Protocol (MCP), Requirements Analysis, User Behavioral Analytics (UBA), Agile
Platforms
Google Ads, HubSpot, Azure, Databricks, Salesforce, Oracle, Amazon Web Services (AWS), Google Cloud Platform (GCP), Microsoft Fabric, SharePoint, Docker, Dataform, Google Dataform, Airbyte, Microsoft Power Automate, Jupyter Notebook, Fabric Lakehouse, Vertex AI, Cortex, Linux, Microsoft Dynamics 365, Azure Synapse, Azure Synapse Analytics, Mixpanel
Storage
Elasticsearch, Microsoft SQL Server, MySQL, Data Pipelines, Data Lakes, Relational Databases, Data Integration, Data Validation, Google Cloud, Master Data Management (MDM), Google Cloud SQL, Google Cloud Storage, Database Architecture, NoSQL, Amazon S3 (AWS S3), Redshift, Databases, ClickHouse, PostgreSQL, Graph Databases, InfluxDB, Database Administration (DBA), MongoDB, PostGIS, SQL Stored Procedures, Datadog, Data Lake Design, Azure SQL Databases, Database Performance
Industry Expertise
Healthcare, Project Management
Other
Data Build Tool (dbt), Generative Pre-trained Transformers (GPT), A/B Testing, Experimental Design, Cohort Analysis, Data Modeling, Product Analytics, Revenue Analytics, Data Science, Artificial Intelligence (AI), Engineering, Data, Looker Studio, Google Analytics 4 (GA4), Data Visualization, Marketing Analytics, Data Blending, Dashboard Design, Data Analytics, Microsoft Power BI Desktop, Data Engineering, Azure Data Factory (ADF), Data Analysis, Architecture, Data Architecture, Database Schema Design, Version Control, Scripting, Deployment, Rollback, DAX, DataOps, Financial Data, IT Service Management (ITSM), Delta Lake, Observability, Monitoring, Data Warehousing, Data Taxonomy, Metadata, Data Quality, Consumer Products, eCommerce, Security, CI/CD Pipelines, Big Data, ETL Pipelines, Dashboards, Data Migration, APIs, Dash, FastAPI, Data Cleaning, Data Transformation, Data Warehouse Design, Financial Reporting Dashboards, Google BigQuery, Query Optimization, Workflow Automation, Development, Solution Design, Configuration Management, Step Debugging, Adobe Workfront, ELT, Identity & Access Management (IAM), Cloud, Enterprise Data Warehouse (EDW), SQL Server, Learning Management Systems (LMS), Quality Assurance (QA), Data Governance, Data Management, Row Level Security, Cloud Platforms, Dashboard Development, BI Reporting, Monte Carlo, Microsoft Graph API, Microsoft Purview, IT Infrastructure, IT Security, Infrastructure, SecOps, Data Encryption, Encryption, Time Series, Airtable, Metrics, Acquisition Analysis, Growth Marketing, Growth Strategy, LTV:CAC, Lifetime Value (LTV), Funnel Analysis, Customer Segmentation, Event Tracking, Statistical Analysis, Statistics, Hypothesis Testing, Reporting, Business Analysis, Stakeholder Management, Fintech, Payments, Customer Retention, User Retention, Key Performance Indicators (KPIs), Storytelling, Microsoft Azure, Categorization, Data Auditing, Data Enrichment, Data Extraction, Communication, Autodesk Construction Cloud, Civil Engineering, Construction, Infrastructure as Code (IaC), Machine Learning Operations (MLOps), Large Language Models (LLMs), HIPAA Electronic Data Interchange (EDI), Electronic Health Records (EHR), Healthtech, Database Optimization, Recommendation Systems, Simulations, Apache Superset, Data Reporting, Data Orchestration, Simulation Orchestration, GeoPandas, Geospatial Data, Simulation Modeling, TimescaleDB, Master Data, Lovable, Personally Identifiable Information (PII), Supabase, HIPAA, Reports, Amazon Redshift, Embedded Systems, AWS Database Migration Service (DMS), DocumentDB, Return on Invested Capital (ROIC), Azure Data Lake, Database Deduplication, FinOps, Enterprise, Medallion Architecture, Orchestration, Scalability, Excel Modeling, Financial Modeling, Data Mapping, Open Source, Life Science, Software Architecture, Solution Architecture, CRM, Cloud Data Platforms, Customer Data, Customer Data Platform (CDP), Enterprise Architecture, Global Strategy, SAP, SAP ERP, QuickBooks Desktop, Database Monitoring, Database Scaling, AI Agents, Information Retrieval, Ontologies, Retrieval-augmented Generation (RAG), Knowledge Graphs, Semantics, Azure Analysis Services, Azure Databricks, Data Mesh, Data Contracts, Churn Analysis, Attribution Modeling, Causal Inference, Incrementality Testing, Customer Acquisition Cost (CAC), Amplitude, Predictive Analytics, Machine Learning, Forecasting, Time Series Analysis, Metabase, SaaS, Marketplaces, Subscriptions, Mobile Analytics, Data Dictionary Development, R Programming, Regression, Troubleshooting, Integration, Enterprise Resource Planning (ERP), Advanced Analytics, Data Cleansing, Agentic AI, Healthcare Analytics, Prompt Engineering, Generative Artificial Intelligence (GenAI), OpenAI, Advertising, Personalization, Feature Engineering, Model Monitoring, Predictive Modeling, Clustering, Credit Risk, Risk Analysis, Technical Documentation, Semantic Layer, Analytics, Data Processing
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