Allan Simiyu Waliaulah
Verified Expert in Engineering
Data Science and Python Developer
Nairobi, Kenya
Toptal member since August 12, 2026
Allan helps businesses turn complex data into actionable insights, improve financial decisions, and streamline operations. With over 7 years of experience across data science and financial engineering, he uses Python, SQL, Power BI, Excel, Tableau, and more to build practical analytical solutions. At Mwango Capital and other companies, he automated credit assessments, reducing turnaround time by 40%, and improved efficiency, risk assessment, and decision-making through data-driven solutions.
Portfolio
Experience
- Data Science and Python - 10 years
- Data Science - 8 years
- Data Analysis - 7 years
- Machine Learning - 7 years
- Recommendation Systems - 7 years
- Databases - 6 years
- Data - 6 years
- Business Intelligence (BI) - 5 years
Work Experience
Financial Data Analyst
Maruway Networks
- Modeled financial viability for the UNICEF Giga project in Kajiado, quantifying connectivity costs per school and projecting 5-year ROI to secure continued grant funding.
- Analyzed cost structures across 1,291 completed projects, identifying that preventative CCTV maintenance reduces emergency callouts by 40%, directly improving margins on routine service contracts.
- Quantified , and still quantifies the financial impact of the 98% telecom service reliability rate, translating uptime improvements into client retention value across the 1,020 active customer base.
- Develops project finance templates for IoT and PA system installations, standardizing cost estimation across 340 partners to reduce bidding errors and improve win rates by 15%.
- Build dynamic dashboards integrating operational data from UNICEF, Airtel, and Famguard projects, delivering weekly P&L forecasts to Fredrick Kimaru and leadership for real-time resource reallocation.
- Evaluated currency and import cost volatility on CCTV and network hardware, structuring supplier payment terms and local sourcing strategies to stabilize gross margins above 35%.
- Developed regression and time-series models on 1,291 completed projects to forecast maintenance demand, reducing emergency callout costs by 18% through optimized technician scheduling.
Credit Analyst
Envestreet Financial
- Reduced average credit assessment turnaround time by approximately 40% by automating borrower ratio calculations, cash flow analysis, and risk-scoring workflows using Python and Excel.
- Assessed 100+ SME and consumer credit applications monthly across lending portfolios exceeding KES 50M, maintaining consistent underwriting standards.
- Identified early-stage repayment risk indicators through borrower segmentation and delinquency trend analysis, enabling collections teams to prioritize high-risk accounts.
- Consolidated fragmented portfolio data into a centralized performance dashboard, reducing management reporting preparation time from several hours to under one hour per cycle.
- Developed automated portfolio monitoring reports tracking arrears, repayment trends, sector concentration, and borrower risk exposure.
- Contributed analytical evidence used in underwriting policy reviews by identifying recurring borrower characteristics associated with elevated default risk.
AI Data Analyst / AI Data Annotator / AI Software Development Specialist
TELUS Digital
- Evaluated search results and digital content for relevance, accuracy, and alignment with task-specific quality guidelines.
- Reviewed AI-related data outputs against established criteria to identify quality issues and support reliable evaluation.
- Applied detailed task guidelines consistently to assess content quality, maintain annotation accuracy, and produce structured evaluation results.
AI Software Development Specialist
Turing
- Developed and reviewed Python solutions to assess code correctness, algorithmic efficiency, edge cases, and adherence to software engineering standards.
- Evaluated AI-generated code against functional requirements, identifying logical errors, implementation weaknesses, and opportunities for improvement.
- Applied software engineering and machine learning knowledge to solve technical problems and assess the reliability of AI-generated solutions.
Statistical Analyst
Mwango Capital
- Delivered 15+ customized research and analytics engagements for investment, financial services, and SME clients.
- Reduced project delivery timelines by automating data collection, cleaning, and reporting workflows using Python and SQL.
- Built forecasting and statistical models to evaluate market trends, business performance, and investment opportunities.
- Analyzed datasets containing thousands of observations, identifying statistically significant performance drivers to inform client strategy.
- Designed executive dashboards and visual reports that reduced stakeholder time-to-insight on key performance indicators.
- Implemented validation and quality-control procedures that minimized reporting inconsistencies across analytical outputs.
Fraud Detection Analyst
Financial Academy & Technologies Ltd
- Investigated 20–40 fraud alerts weekly across customer accounts and financial transactions, improving speed and consistency of case resolution.
- Introduced risk-based alert prioritization criteria, focusing investigation resources on transactions with the highest fraud indicators.
- Conducted behavioral and transaction-pattern analysis across 50+ monitored accounts, identifying anomalies that triggered further investigation.
- Developed standardized fraud investigation documentation and reporting templates, reducing information gaps between operational and compliance teams.
- Applied statistical and rule-based detection techniques to uncover unusual transaction behavior and strengthen monitoring processes.
Freelance Data Annotation & AI Training Contractor
Remotasks, Aligner, Outlier
- Performed image annotation—bounding boxes, polygon segmentation, keypoint labeling, and semantic segmentation—for computer vision model training across retail, medical imaging, and autonomous-vehicle datasets.
- Handled NLP annotation tasks including intent classification, named entity recognition, sentiment tagging, and dialogue state labeling.
- Contributed to RLHF tasks: ranking and writing comparative feedback on AI-generated responses to support model alignment.
- Reviewed annotations from other contributors to resolve conflicts and maintain dataset accuracy against project benchmarks.
- Processed and cleaned raw data prior to annotation, including deduplication and format normalization.
- Maintained consistent quality scores, qualifying for higher-accuracy annotation projects over time.
Mathematics Tutor
Studypool Inc.
- Tutored high school and college students in mathematics and statistics.
- Designed curriculum-aligned lesson plans and practice exams.
- Used Python to analyze student performance data and adjust tutoring strategies.
Project History
Scape Data Intelligence Platform — Back End
https://github.com/awaaat/scape-backendScape Data Solutions — Data Intelligence Web Platform
https://github.com/awaaat/scape-data-solutionsLand-for-sale Market Analysis & Seller Segmentation
https://github.com/awaaat/land_for_sale_data_analysisE-commerce Recommendation System
https://github.com/awaaat/recommendation_systems/Natural Language Processing and Text Analysis
https://github.com/awaaat/Natural-Language-ProccessingWater Access & Infrastructure Analytics Dashboard (Power BI)
https://app.powerbi.com/view?r=eyJrIjoiNDJiMTUxZmMtZTdmMS00Njk0LWE5MjktNWUzY2Y4OWZiMzI1IiwidCI6ImVmZWI4N2UyLWVlNTAtNGM2Mi05NTc1LTM5N2FkYWUxNzVkYyJ9Education
Master's Degree in Financial Engineering
Worldquant University - Online
Bachelor's Degree in Mathematics
Machakos University - Machakos, Kenya
Certifications
ALX Full stack Data Scientist
ALX Africa
Skills
Libraries/APIs
Scikit-learn, PyTorch, OpenCV, XGBoost, Matplotlib, jQuery, React, Auth, Node.js, Uber API, Open APIs, Google Analytics API, Wix# (WixSharp), WooCommerce API, Plaid API, SpaCy, REST APIs, Pandas
Tools
Tableau, Git, Seaborn, Plotly, Microsoft Power BI, Dynamics 365 Business Central, Jupyter, Spreadsheets, NGINX, Seos, Excel 2016, Wix, Microsoft Excel, Google Analytics, Jira, Microsoft Access, AWS Cloud Development Kit (CDK), Terraform, Wix Studio, Shopify Plus, CAD
Languages
Python, SQL, JavaScript, Bash, Java, TypeScript, HTML, HTML5, GraphQL, Rust, PHP, Verilog, C++, C, Embedded C, Embedded C++
Frameworks
Django, ASP.NET, Next.js, Tailwind CSS, Flutter, React Native, Laravel, Ionic 2
Paradigms
DevOps, REST, Responsive Web Design (RWD), Testing, API Architecture, Mobile Development, Business Intelligence (BI), Cross-platform, Adaptive, Refactoring
Platforms
QuantConnect, Vercel, Linux, Ubuntu, WordPress, WooCommerce, Android, Firebase, Microsoft Fabric, QlikView, iOS, Amazon Web Services (AWS), Web, HubSpot, Amazon, Workday Analytics & Reporting, Docker, FlutterFlow, Mobile, Shopify
Storage
PostgreSQL, MySQL, Databases
Industry Expertise
Web Design, Project Management, Cybersecurity, Revenue Operations (RevOps)
Other
Financial Data, Financial Engineering, Stochastic Modeling, Stochastic Differential Equations, Derivative Pricing, Portfolio Analysis, Mathematics, Linear Regression, Calculus, Education, Applied Mathematics, Algorithms, Financial Modeling, Risk Management, Quantitative Finance, NLTK, Data Analysis, Natural Language Processing (NLP), Unsupervised Learning, Machine Learning, RDLC Reports, Cloud Infrastructure, Large Language Models (LLMs), AI Model Training, Code Review, Capacity Planning, Incident Response, Monitoring, Observability, Data Cleaning, Exploratory Data Analysis, Market Intelligence, Inventory Management, Subscriptions, Shipping, Full-stack, Full-stack Development, Cloudflare, Row-level Security (RLS), Supabase, Branding, Artificial Intelligence (AI), Authentication, DevOps Engineer, Security, Content Management Systems (CMS), Payment Gateways, Web Development, PayPal, Forecasting, Machine Learning (ML) APIs, Software Engineering, Software Development, User Interface (UI), Analytics, eCommerce, API Integration, Android App Development, Mobile App Development, Elementor, Architecture, Technical Leadership, Back-end, Network Engineering, Performance Optimization, Network Protocols, LLVM, Memory Management, Optimization, Azure Data Factory (ADF), Data Architecture, Data Modeling, Generative Artificial Intelligence (GenAI), Excel Add-ins, Intuit QuickBooks, Development, Technical Project Management, Operating Systems, Technical Documentation, Fintech, Data Visualization, User Experience (UX), Google, Cyber Defense, API Design, Data, API Testing, AI Agents, Data Management, Excel Macros, Documentation, Gravity Forms, Integration, System Architecture, WordPress Plugins, Customer Relationship Management (CRM), Lead Generation, Troubleshooting, Conditional Logic, Google Search Console, Product Roadmaps, Product Management, Product Strategy, LLM Fine-tuning, Small Language Models (SLMs), Quantization, Generative Pre-trained Transformers (GPT), Web Scraping, AI Automation, App Submission, Backups, Data Engineering, Recommendation Systems, Unsupervised Machine Learning, Data Science, Collaborative Filtering, AWS Security Hub, CI/CD Pipelines, OpenTelemetry, AWS Control Tower, Shopify Customizations, NetSuite, Workday, Operations.Business Operations, Databases.SQL, Claims, Industry.Healthcare & Insurance.Insurance, Logistics, Marketing Analytics, Process Automation, Production, Trading, Industry, Transportation & Shipping, Data Science and Python, Mobile eCommerce, eCommerce Development, Mechanical Engineering, ESP32, Embedded Hardware, WooCommerce Subscriptions 2, Technical Writing, Computer Systems Architecture, Embedded Systems, Hardware Engineering, Control Systems, Scripting, Digital Design, Debugging, Design Documentation, Electronics, Hardware Design, Advisory.Business Advisory.Corporate Finance, Advisory.Business Advisory.Management Consulting, Market Research, Mergers & Acquisitions (M&A), Advisory.Business Advisory.Supply Chain, Chargeback, Industry.Finance.Financial Modeling.Variance Reporting, Industry.Finance.Financial Modeling.Financial Planning & Analysis (FP&A), Business Performance Management (BPM).Anaplan, Global Banking, Capital Raising.Credit/Debt.Consumer Lending, Systems & Tools.Hyperion, Controllership/Accounting.Accounting, Advisory, Risk & Compliance.Credit Underwriting, Capital Raising.Credit/Debt, Financial Spreading, Sageworks, Anti-money Laundering (AML), Risk & Compliance, Data Annotation, Controllership/Accounting.Financial Accounting, Industry.Finance.Financial Modeling.Financial Analysis, Controllership/Accounting.Financial Reporting, Fund Accounting & Administration, Industry.Hedge Funds, Private Equity, Reinforcement Learning, APIs, Airtable, Statistics, Mathematical Modeling, Numerical Analysis, Statistical Modeling, Risk Modeling, SQLRisk Modeling, Dashboard Design, Finance, Feature Engineering, Text Analytics, Data Preprocessing, Text Classification
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