Chris Lee, Software Developer in Cambridge, MA, United States
Chris Lee

Software Developer in Cambridge, MA, United States

Member since October 3, 2017
Chris has years of experience in developing API services. He's most comfortable using the aiohttp package, SQLAlchemy (Alembic), and the PostgreSQL stack, but he's also familiar with Flask, MongoDB, Redis, and more. He's been a part of the back-end team at Indico Data Solutions—a machine learning API and tools provider—developing back-end services handling big data processing and analysis. Chris also has excellent skills with AWS, GCE, and Azure clouds.
Chris is now available for hire

Portfolio

  • Indico Data Solutions
    TensorFlow, Scikit-learn, PostgreSQL, SQLAlchemy, Tornado, Python...
  • Metalenz
    React, Python 3, Poetry, SDKs, APIs, PyQt 5, HTTP Server, Python Asyncio...
  • JEFuller
    Python 3, SQLAlchemy, Docker, Python, Object-oriented Programming (OOP)...

Experience

Location

Cambridge, MA, United States

Availability

Full-time

Preferred Environment

Docker, Ubuntu, MacOS

The most amazing...

...thing has been designing and developing the entire tech infrastructure for https://indicodata.ai: it serves huge data loads and produces tons of business value.

Employment

  • Principal Engineer

    2015 - PRESENT
    Indico Data Solutions
    • Designed and integrated new technologies into an incredibly large and complex microservices infrastructure.
    • Mentored multiple teams of engineers and guided them in the design and development of features.
    • Built, maintained, and deployed back-end services for data visualization tools, data analysis, and custom machine learning model training tools (Indico's Crowdlabel).
    • Developed, maintained, and deployed a machine learning API server with several gigabytes of machine learning models behind the scenes.
    • Constructed in-house deployment utilities for AWS, Azure Cloud, and Google Compute Engine capable of spinning up several clusters of API workers with a simple script.
    • Created a scheduling service that extracts information via scraping an API from several online mediums, performs a series of text analyses (keywords, topics, text features, sentiment, and more), and continuously builds a text corpus.
    • Developed and maintained client libraries and SDKs for machine learning APIs across several different languages, including Python, Java, Android, JavaScript (Node.js), Ruby, PHP, and until recently, R.
    • Set up continuous integration on all projects using Docker, Docker Compose, and CodeShip (Jet).
    • Improved large data ETL and database transactions by optimizing speed and memory consumption.
    • Managed the infrastructure in Kubernetes and deployed a series of Celery pipelines woven together with a Redis-result store and a RabbitMQ cluster broker.
    Technologies: TensorFlow, Scikit-learn, PostgreSQL, SQLAlchemy, Tornado, Python, Google Compute Engine (GCE), Azure Cloud Services, Amazon Web Services (AWS), Docker, NumPy, Data Scraping, Object-oriented Programming (OOP), Async/Await, Distributed Systems, Containerization
  • SDK Engineer

    2022 - 2022
    Metalenz
    • Built Python API for camera hardware and calibration processes.
    • Helped integrate camera hardware into desktop GUI application, using PyQT5 and the API I developed.
    • Built the user portal back end and front end on FastAPI, SQLAlchemy, and React to provide authenticated file access to users.
    Technologies: React, Python 3, Poetry, SDKs, APIs, PyQt 5, HTTP Server, Python Asyncio, PostgreSQL, FastAPI, Object-oriented Programming (OOP), Async/Await, Containerization
  • SQLAlchemy Consultant

    2020 - 2021
    JEFuller
    • Served as a database consultant on how to improve the database structure and database queries.
    • Performed a high-level audit of an existing system and created a low-to-high priority action items report.
    • Assisted in debugging nondeterministic behavior with database connection management. Refactored the codebase to have cleaner and more reliable database connection logic.
    Technologies: Python 3, SQLAlchemy, Docker, Python, Object-oriented Programming (OOP), Async/Await, Containerization
  • Software Developer

    2019 - 2020
    TargetSmart
    • Developed TargetSmart APIs on AWS Lambda. Maintained, modified, and tested APIs as necessary.
    • Queried database information from an AWS Aurora SQL database.
    • Developed auto-example API generation for client-facing documentation.
    • Supported the updating and adding documentation to new APIs.
    Technologies: Pandas, AWS Lambda, Python, SQLAlchemy, Docker, Object-oriented Programming (OOP), Async/Await, Containerization
  • Python Developer

    2018 - 2020
    Ontic
    • Interfaced with several crypto-exchange APIs like KuCoin, Binance, Bittrex, Bitfinex, OKEx, Poloniex, Huobi, and CCXT.
    • Used REST APIs and WebSocket APIs to acquire data in real time.
    • Saved time-sensitive data into a Redis database and enabled database clients to retrieve data through a simple interface.
    • Developed async IO implementations for asynchronous operations.
    • Used cfscrape (a Python library) to bypass a Cloudflare anti-bot page.
    Technologies: PostgreSQL, Redis, Python, Docker, NumPy, Data Scraping, Object-oriented Programming (OOP), Async/Await, Containerization
  • Python and Facebook API | Developer

    2018 - 2019
    Lerderian, Inc. (via Toptal)
    • Created a series of recurring data ETL tasks for API data from Facebook and Instagram.
    • Developed an image downloader and vectorizer and stored the data in PostgreSQL for future use in image analysis.
    • Built an HTTP Server to trigger ETL tasks, synced Facebook accounts through OAuth 2, and performed analysis tasks on data.
    • Created a database schema that allows for plug-and-play data ETL types from different API endpoints.
    • Developed a sophisticated command-line tool to interface with an aiohttp server.
    Technologies: Facebook Open Graph API, RedBeat, Docker, Celery, Python 3, SQLAlchemy, Python, Data Scraping, Object-oriented Programming (OOP), Async/Await, Distributed Systems
  • Software Developer

    2018 - 2018
    Seven Hills
    • Handled the ingressing and processing of Google Sheet data via the Google API.
    • Designed an interface for Windows executable to run browser automation and data collection.
    • Automated the Windows COM API for a desktop application.
    Technologies: Google Sheets API, Selenium, Docker, Python, Data Scraping, Object-oriented Programming (OOP), Async/Await
  • Software Developer

    2018 - 2018
    IDEA Public Schools
    • Automated scraping data from web portal.
    • Queried MS SQL database across multiple tables for aggregate and time-series information.
    • Generated multi-sheet Excel workbooks with formatting and formulas.
    • Automated weekly/monthly report generation using a Windows scheduler.
    Technologies: COM, Microsoft, Selenium, Docker, Python, Object-oriented Programming (OOP)
  • Android Developer Intern

    2014 - 2015
    Hangtime, Inc.
    • Used LruCache and preloading to create smooth scrolling and fragment transitions.
    • Built generalized adapters to use the same item caching and loading techniques across the application—decreasing the amount of additional logic and maintenance in the codebase.
    • Created custom animations for spinners, loading screens, and sliding notifications and banners.
    • Implemented a variety of intents for deep linking, third-party activity linking (camera, SMS, email, and other social media apps).
    • Reduced the source code to less than half of the original while adding twice the amount of features—bringing the product to feature completeness.
    Technologies: Content, Responsive, Google API, Facebook API, Google Maps API, Android SDK, Android Studio, Docker, Object-oriented Programming (OOP)

Experience

  • Privvy
    https://github.com/sihrc/privvy

    Privvy is a system that synchronizes private files not tracked by Git in Git repositories using a more secure source. It makes use of Git hooks and actively sets the Git template directory to be used for all git repositories, but will not overwrite existing content (make a backup just in case).

    It comes with Bash functions that are set up on package installation to either manually sync private files or to set up the Git hook integrations.

  • Tornado and Motor Boilerplate
    https://github.com/sihrc/tornado-boilerplate

    This was the first revision of an API framework written in Python using Tornado and Motor (MongoDB). It contains generic handlers for API routes as well as for user authorization.

    It contains boilerplate that allows API routes to take shape quickly from scratch. It has a 100% test coverage run with a Travis integration.

  • StoryQuilt | Android App
    https://github.com/sihrc/Story-Quilt

    A collaborative story-telling app. Users take turns adding short phrases to a story while only seeing a couple phrases prior.

    This was a culmination of a semester course on Android development. It puts into practice various kinds of ItemAdaptors, modularized fragments, real-time database synchronization (Firebase), and Google User authentication and permissions.

  • Indikit
    https://github.com/sihrc/indikit

    A lightweight web app that demonstrates the power of machine learning APIs. It is a React.js application that capitalizes on the reusability of components for a dynamic and clearly defined interface.

    It also contains an API wrapper designed to allow easy access to the machine learning APIs.

Skills

  • Languages

    R, Python, Python 3, SQL, Java 8
  • Libraries/APIs

    SQLAlchemy, NumPy, Google APIs, Pandas, TensorFlow, Google Maps API, Facebook API, Google API, Facebook Open Graph API, Google Sheets API, React, ZeroMQ, Scikit-learn, PyQt 5, Python Asyncio
  • Tools

    Docker Compose, Celery, AWS ECS, Google Compute Engine (GCE), Android Studio, RedBeat
  • Paradigms

    DevOps, Object-oriented Programming (OOP), Agile Software Development, Responsive
  • Platforms

    Docker, Google Cloud Platform (GCP), Azure, Android, MacOS, Ubuntu, Amazon Web Services (AWS), AWS Lambda, Microsoft
  • Storage

    AWS S3, Redis, PostgreSQL, RethinkDB, MongoDB, Azure Cloud Services
  • Other

    APIs, Software Design, Architecture, Async/Await, Containerization, Tornado, Data Scraping, Distributed Systems, Content, COM, Poetry, SDKs, HTTP Server, FastAPI
  • Frameworks

    Android SDK, Selenium, Flask

Education

  • Bachelor of Science Degree in Engineering: Computing
    2011 - 2015
    Olin College of Engineering - Needham, MA, USA

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