Jolene Valenzuela

Full Stack Web and Mobile Development

• Tech stack: JavaScript/TypeScript, Angular, React, React (Native/Web), PHP, Laravel, Django, MySQL, PostgreSQL, Directus, WordPress, Contentful, Twilio, Algolia
• Tasks:
  • Frontend and cross-platform development: Developed web applications and unified mobile components (iOS, Android, Web) using Angular, React Native, and React Native Web with focus on type safety and reusable UI.
  • Backend and API architecture: Built RESTful APIs, business logic, and authentication in Laravel and Django to serve decoupled web and mobile clients.
  • Data modeling and database administration: Designed relational database schemas, wrote SQL queries, and optimized indexes across PostgreSQL and MySQL for query performance and data integrity.
  • CMS and platform integrations: Configured headless CMS architecture (Directus, Contentful) alongside monoliths (e.g. WordPress) and integrated third-party services such as Twilio for automated messaging and Algolia for real-time search.

Data Science, Data Engineering, and Machine Learning

• Tech stack: Python, Pandas, NumPy, Scikit-learn, Matplotlib, Seaborn, NLTK, XGBoost, LightGBM
• Tasks:
  • Data preprocessing and cleaning: Built end-to-end preprocessing pipelines for tabular, text, and image datasets, implemented imputation on missing data, categorical encoding, and feature scaling.
  • Exploratory data analysis and visualization: Engineered custom visualizations to inspect feature distributions, evaluate correlation matrices, map multi-class decision boundaries, and analyze feature importance scores.
  • Feature engineering and Natural Language Processing: Extracted linguistic features using BoW, TF-IDF, and n-gram representations to process raw text data from sources like email payloads and sentiment reviews.
  • Model training and evaluation: Trained, tuned, and cross-validated linear models, kernel methods, and tree-based ensembles (Random Forest, XGBoost, LightGBM) for classification and regression tasks; assessed performance via F1-score, ROC-AUC, confusion matrices, RMSE, MAE, R², and residual analysis.

• Tech stack: Laravel (PHP), MySQL, Angular, Angular Material, Twilio, Directus, Leaflet
• Collaborated on a crowd-sourced incident reporting and map-based visualization platform
  • Worked on API development to ensure smooth integration between platforms
  • Worked on authentication features, including phone-based OTP verification using Twilio
  • Built new sites using Angular:
    • Landing site
    • Reporting site
  • Improved report submission workflow
  • Implemented spam report management
  • Implemented timeline view

• Tech stack: Wordpress, PHP, MySQL
• Worked on frontend enhancements and maintenance for the websites of several aviation schools

• Tech stack: PHP, Javascript, MySQL
• Worked on new frontend and backend features, including automation for several processes, API integration, UI redesign, login, and mobile-responsiveness
• Revamped both the frontend and backend of their online storefront

• Tech Stack: React Native, React Native Web, Django, Algolia, Contentful
• Collaborated in the full-stack implementation of both the web and mobile version of their social networking site and hiring platform for skilled trades
• Focused on implementing reusable UI elements, connecting UI with business logic, and integration of Algolia and Contentful

• Tech Stack: Javascript/Typescript, Angular
• Implemented frontend components with Clarity Design System
  • Data visualization charts
  • Navigation
  • Detail pages
  • Lists and tables
  • Modals
  • Notifications and alerts

• Industries catered to: FMCG, Fast Food, Government, Healthcare, Insurance, Retail, etc.
• Common tech stack: Google Dialogflow, Google Cloud TTS and STT, Google Cloud products (e.g. Cloud Run, Cloud SQL, Google Pub/Sub, Cloud Translation, etc.), Twilio
• Presented product and solution demos to clients with focus on Conversational AI products and solutions (i.e. chatbots, voicebots, callbots)
  • Conducted needfinding sessions with clients to identify products and/or solutions that meet their requirements
  • Designed and built solution proofs-of-concept (POC) based on the needfinding sessions
• Designed and built product POCs mainly using Google Cloud
• Also assisted with architecting machine learning solutions mostly built on Google Cloud (and occasionally, AWS)
• Collaborated with Software Engineers in architecting projects
• Supported the Sales Department in the following sales processes:
  • Crafting documents (e.g. proposals, responses to RFIs and RFQs, scope of work/SOW, estimated platform costs, estimated timelines)
  • Providing technical information and documentation regarding the company's products and services
  • Providing technical support to the clients' teams
  • Improving the overall sales process

• Tech stack: Python (Jupyter, Scikit-learn, Facebook Prophet, Numpy, Pandas)
• Performed exploratory data analysis, experiments, and Implemented ML models on forecasting and anomaly detection for timeseries data
  • Several options were tested for the task: K-Means Clustering, SVM, Isolation Forest, Gaussian Distribution, Seasonal ESD, and Facebook Prophet
  • Facebook Prophet was chosen due to seasonality options, option to add holiday effects, option to impute missing data points, and ability to forecast trends
• Presented findings to the Enterprise Data department of the company
• Helped design a system that integrates ML models into the company workflow
• Assisted in training the employees of the Enterprise Data department on how the models will be integrated into their workflows, how parameters can be configured, and how to generate data visualizations

User experience research and design

• Tools used: Figma
• Processes involved: Design thinking, Design research, Prototyping, User Interface design, Usability testing

• Industries: Retail, insurance, banking, government
• Processes involved: Design thinking, Design research, Prototyping, User Interface design, Usability testing
• Tools used: Figma
• Also assisted in conducting User Experience and Design Thinking workshops
• Conducted a case study on the processes of a government agency in the Philippines