Mark is available for hire

Mark Ventimiglia

Verified Expert in Engineering

Full-stack Developer

Chicago, United States

Toptal member since July 15, 2022

Expertise

Back-end Developers Embedded Systems Engineering Front-end Integration Mathematics Web Development Firmware Multithreading Algorithms Embedded Software Engineering Data Engineering Full-stack Cloud Architecture

Bio

Mark has over two decades of experience as a team leader and an individual contributor in results-driven, highly adaptive environments. He is adept at defining technical vision and business strategy and developing products and solutions that deliver immediate value for companies. He is a proven communicator and team builder and an expert in the modern technologies and frameworks used in full-stack, back-end, and embedded development environments.

Portfolio

Dark Matter2bd

Azure, .NET, C#, Snowflake, Databricks, Data Lakes, Architecture...

Rapid Health Pro

HTML, JavaScript, Full-stack, HTML5, Amazon Web Services (AWS), API Development...

EVERSANA

SQL, Python, JavaScript, TypeScript, Snowflake, PostgreSQL, React, Vue, Django...

Experience

C - 20 years
SQL - 20 years
JavaScript - 20 years
Python - 12 years
Django - 7 years
React - 4 years
C# - 4 years

Availability

Full-time

Preferred Environment

Windows, Python, JavaScript, C, C#, Git, Linux, Snowflake, PostgreSQL, Amazon Web Services (AWS), Raspberry Pi, Windows API

The most amazing...

...thing I've built is a home automation solution combining low-cost custom devices, cloud back end, and mobile management apps into a single end-to-end solution.

Work Experience

CTO

2023 - PRESENT

Dark Matter2bd

Acted as head of engineering and principal software and data architect for a team of 12 data and software engineers developing a SaaS data analytics platform capable of running real-time insights on 28 B medical claims.
Designed a data architecture built on Azure, Databricks, and Snowflake that powers the only platform in the marketplace capable of real-time analysis of a corpus of around 60% of all US medical claims.
Grew revenue by 120% YoY and took the company cash-flow positive in 12 months through (1) executing a product roadmap that enabled 4x growth in the sales funnel and (2) reducing data warehouse and cloud infrastructure costs by 75% in three months.
Designed and built the product that evolved into our primary data delivery channel. Gave technical direction to the engineering team and enacted engineering best practices such as automated testing, integrated issue tracking, and release management.

Technologies: Azure, .NET, C#, Snowflake, Databricks, Data Lakes, Architecture, Technical Leadership, Software Architecture, Medical Software, D3.js, Data Visualization, ETL Tools, Multithreading, Data Engineering, PySpark, Big Data, Data Science, Lambda Functions, Slack, Technical Documentation, Data Processing, Networking, Dashboards, Auth0, Algorithms, Material UI, Scalability, Large-scale Projects, Startups, Database Architecture, ASP.NET, Agile Software Development, Data Structures, Advisory, Engineering, Process Development, Coaching, Cloud Architecture, Test-driven Development (TDD), IT Security, Data Strategy, Data Monetization, Big Data Architecture, Analytical Dashboards, Data-driven Dashboards, Interactive Dashboards, Web Dashboards, Data Integration, HIPAA Electronic Data Interchange (EDI), Animated Interactive Graphs, BI Reporting, Interactive UI

CTO

2022 - 2023

Rapid Health Pro

Developed and deployed a web front end for a medical scheduling and billing application that handled 150,000 medical claims per month.
Grew the business to $13 million MRR while reducing cost by 75% by building an automated claims submission and fulfillment back end that allowed us to eliminate manual claims management.
Implemented a HIPAA-compliant platform and development environment in the cloud. Built tools and processes to deploy into containers on AWS and migrated all customer data into a SOC2-compliant data architecture built in a cloud data warehouse.
Applied industry best practices, including source control via Git, continuous integration and repeatable builds, automated testing, and infrastructure as code via Terraform.

Technologies: HTML, JavaScript, Full-stack, HTML5, Amazon Web Services (AWS), API Development, Python, Databases, Architecture, Technical Leadership, Software Architecture, Medical Software, Data Visualization, ETL Tools, Multithreading, Data Engineering, Big Data, Lambda Functions, Slack, Technical Documentation, Data Processing, Networking, Dashboards, Algorithms, Material UI, Scalability, Large-scale Projects, Startups, eCommerce, Marketplaces, Bots, Tailwind CSS, WordPress, Database Architecture, Agile Software Development, Data Structures, Advisory, Engineering, Process Development, Coaching, Cloud Architecture, Test-driven Development (TDD), IT Security, Data Strategy, Big Data Architecture, Analytical Dashboards, Data-driven Dashboards, Interactive Dashboards, Web Dashboards, Data Integration, HIPAA Electronic Data Interchange (EDI), BI Reporting, Interactive UI

Vice President of Engineering

2019 - 2022

EVERSANA

Managed a team of over 30 data architects and software engineers in the US and India to develop SaaS AI/ML analytics platforms and data warehouse and data lake solutions for the EVERSANA ACTICS portfolio.
Grew the data and analytics business revenue by 193% YoY and grew EBITDA from negative to over $5 million from 2020 to 2021. Exceeded 2021 revenue targets by over 7%.
Developed software architecture for public cloud apps on AWS and Azure. Provided technical leadership to teams that develop data models, security frameworks, and application architectures to enable the delivery of data and AI/ML-driven analytics.
Designed, implemented, and deployed the PRDICT predictive analytics platform for a Fortune 500 client. PRDICT delivers an intuitive interface for customers to run ML-driven predictive models for brand trends.
Implemented software engineering best practices and agile transformations, including standardized SCM and tooling, CI/CD and test automation, database configuration management, and infrastructure as code.
Developed engineering talent within the D&A team. Held regular software engineering training sessions, and ramped up junior engineers in the US and India through architecture deep dives, pair programming, and design and code reviews.

Technologies: SQL, Python, JavaScript, TypeScript, Snowflake, PostgreSQL, React, Vue, Django, C#.NET, Windows, C, Git, Linux, Distributed Systems, Full-stack, Back-end, Databases, Docker, SaaS, Cypress, Leadership, Full-stack Development, Minimum Viable Product (MVP), Node.js, Charts, CSS, HTML, JavaScript Charting, Front-end, REST APIs, Low-code Development, Low Code, AWS Lambda, Microsoft Azure, Blazor, Selenium, APIs, Redux, React Redux, GraphQL, Amazon Web Services (AWS), Optimization, Natural Language Processing (NLP), Generative Pre-trained Transformers (GPT), Next.js, Mapbox, Healthcare & Insurance, .NET, .NET Core, ASP.NET Core MVC, API Integration, Confluence, Technical Writing, Writing & Editing, Localization, Architecture, Software Design, Legacy Code, Legacy Software, Integration, Healthcare, MySQL, Migration, ETL, Mathematics, Azure, SOLID Principles, Web Development, Microservices, Elasticsearch, Pandas, Data Analysis, CI/CD Pipelines, Technical Leadership, HTML5, Figma, API Development, JSX, Responsive Web Apps, GitHub, Data Scraping, Web Scraping, Python Asyncio, CTO, Team Leadership, Software QA, Customer Relationship Management (CRM), Project Management, Data Architecture, Unit Testing, Abstract Syntax Trees (AST), Databricks, Pytest, pylint, UI Development, Geolocation, SCSS, Data Mining, Software Architecture, Medical Software, D3.js, Data Visualization, ETL Tools, Multithreading, Data Engineering, Big Data, Data Science, Bitbucket, Jira, Lambda Functions, Slack, Technical Documentation, Data Processing, Dashboards, Algorithms, Material UI, Scalability, Large-scale Projects, Startups, Marketplaces, Flask, Bots, Database Architecture, ASP.NET, Agile Software Development, Data Structures, Advisory, Engineering, Process Development, Coaching, Cloud Architecture, Test-driven Development (TDD), IT Security, Data Strategy, Data Monetization, Big Data Architecture, Analytical Dashboards, Data-driven Dashboards, Interactive Dashboards, Web Dashboards, Data Integration, HIPAA Electronic Data Interchange (EDI), Animated Interactive Graphs, BI Reporting, Interactive UI

Vice President of Product

2019 - 2021

Mavenir

Defined product strategy and roadmap for the Mavenir Business Monetization Platform. Managed sales and operations teams in the US and LATAM to sell and deploy the MBMP into carrier networks and operationalize chatbot and data rewards campaigns.
Worked with engineering and product teams to define features and execute development plans. Integrated product management and engineering processes into Mavenir, reducing OpEx and improving the scalability of the product development lifecycle.
Managed P&L for the monetization business, including sales forecast and funnel, bookings, billings, and operational expenses. Implemented a strategy that grew revenue from $3 million in FY 2018 to $7.5 million in FY 2019 and $14 million in FY 2020.

Technologies: SQL, PostgreSQL, Oracle, Java, Windows, Git, Distributed Systems, Databases, SaaS, Leadership, Minimum Viable Product (MVP), CSS, HTML, Low-code Development, Low Code, APIs, API Integration, Technical Writing, Writing & Editing, Localization, Architecture, Software Design, Legacy Code, Legacy Software, Integration, MySQL, Mathematics, SOLID Principles, Web Development, Microservices, Data Analysis, Technical Leadership, REST APIs, HTML5, API Development, Responsive Web Apps, CTO, Team Leadership, Software QA, Customer Relationship Management (CRM), Project Management, Unit Testing, Multithreading, Data Engineering, Big Data, Bitbucket, Jira, Slack, Technical Documentation, Data Processing, Networking, Algorithms, Scalability, Large-scale Projects, Startups, Database Architecture, Agile Software Development, Data Structures, Advisory, Engineering, Process Development, Coaching, Cloud Architecture, TCP/IP, Data Strategy, BI Reporting, Interactive UI

Vice President of Firmware Engineering

2017 - 2019

Dynamics

Managed a team of 12 software engineers, manufacturing testers, and field testers in the US and India, developing embedded device software for the Dynamics portfolio of battery-powered payment cards.
Grew engineering team capacity through new hires and by implementing best practices. Met or exceeded all goals for employee retention and engagement and focused on professional development for the engineering team as a low-cost force multiplier.
Acted as a principal software architect for the card portfolio. Designed and implemented embedded and application software for the cards, cloud applications, and manufacturing systems.
Collaborated with hardware, magnetics, and manufacturing teams to create and execute hardware and firmware roadmaps, including ASIC requirements, design, and verification.

Technologies: C, Python, Assembly, MSP430, 5G, Windows, Git, Linux, Electrical Engineering, Computer Engineering, Distributed Systems, SQL, Back-end, Embedded Systems, Databases, SaaS, Leadership, Full-stack Development, Minimum Viable Product (MVP), CSS, HTML, REST APIs, Web3.js, Bitcoin, APIs, Amazon Web Services (AWS), Optimization, .NET, .NET Core, jQuery, ASP.NET Core MVC, API Integration, Confluence, Technical Writing, Writing & Editing, Architecture, Software Design, Legacy Code, Legacy Software, Integration, Progressive Web Applications (PWAs), Yocto, Embedded C, Microcontrollers, MySQL, Mathematics, Windows API, Windows Forms (WinForms), Windows Presentation Foundation (WPF), SOLID Principles, Web Development, Microservices, Hardware Drivers, Hardware, CI/CD Pipelines, Technical Leadership, HTML5, API Development, GitHub, Firmware, CTO, Team Leadership, Software QA, Customer Relationship Management (CRM), Project Management, Data Architecture, Unit Testing, pylint, UI Development, SCSS, Software Architecture, Multithreading, Data Engineering, Big Data, Embedded C++, Embedded Linux, Technical Documentation, Internet of Things (IoT), IoT Protocols, MQTT, Data Processing, Networking, Algorithms, Scalability, Large-scale Projects, Startups, eCommerce, Marketplaces, Database Architecture, Agile Software Development, Data Structures, Advisory, Engineering, Process Development, Coaching, Cloud Architecture, Embedded Software, TCP/IP, Fintech, Test-driven Development (TDD), Qt, IT Security, Big Data Architecture, Analytical Dashboards, Data-driven Dashboards, Interactive Dashboards, Web Dashboards, Data Integration, BI Reporting, Interactive UI

Vice President of Software Engineering

2013 - 2015

Green Edge Technologies

Managed a team of six US-based engineers and 12 contract engineers in Vietnam, developing embedded device software, Android UI software, and AWS-based distributed management software for the EDGEHome home automation solution.
Acted as product owner for the EDGEhome system software, with final responsibility to create and execute the product roadmap for the EDGEhome home automation portfolio.
Met with builders, developers, electricians, and city inspectors to evangelize and market the portfolio and ensure end-user interests were reflected in product requirements and architecture.
Implemented agile software methodology, repeatable build practices, and automated test frameworks for embedded firmware and cloud software products.
Designed, implemented, and tested software for low-cost consumer devices as part of the EDGEhome solution. Wrote software for device discovery and provisioning, message routing, firmware upload, software image management, and message encryption.

Technologies: Assembly, Python, JavaScript, Java, Android, Windows, C, Git, Linux, Electrical Engineering, Computer Engineering, Distributed Systems, SQL, Full-stack, Back-end, Embedded Systems, Databases, C++, SaaS, Leadership, Full-stack Development, Minimum Viable Product (MVP), Node.js, CSS, HTML, Front-end, REST APIs, AWS Lambda, Microsoft Azure, Selenium, APIs, Amazon Web Services (AWS), PHP, Optimization, jQuery, API Integration, Technical Writing, Writing & Editing, Localization, Architecture, Software Design, Legacy Code, Legacy Software, Integration, Progressive Web Applications (PWAs), Raspberry Pi, Yocto, Embedded C, Microcontrollers, MySQL, Migration, Mathematics, Windows API, Windows Forms (WinForms), Windows Presentation Foundation (WPF), Azure, SOLID Principles, Web Development, Microservices, Hardware Drivers, Hardware, CI/CD Pipelines, Technical Leadership, HTML5, API Development, GitHub, Firmware, CTO, Team Leadership, Software QA, Customer Relationship Management (CRM), Project Management, Data Architecture, Unit Testing, pylint, Google Maps, UI Development, Software Architecture, Multithreading, Data Engineering, Bitbucket, Jira, Embedded C++, Embedded Linux, Technical Documentation, Internet of Things (IoT), IoT Protocols, AWS IoT, Data Processing, Networking, Algorithms, Scalability, Startups, eCommerce, Flask, Database Architecture, Agile Software Development, Data Structures, Advisory, Engineering, Process Development, Coaching, Cloud Architecture, Embedded Software, TCP/IP, IT Security, Data Integration, BI Reporting, Interactive UI

Experience

MedFuse One

https://home.medfuse.one/

I was the architect and lead developer for MedFuse One, a SaaS data analytics service that provides real-time analysis of a corpus of over 60% of US medical claims. The application runs on Azure with a front end using both the React and Blazor frameworks and a C#/.NET back end. The ELT pipeline is built on Databricks and ingests 2 TB per month of raw medical claims and master data. The pipeline is designed to validate the incoming data and consolidate the multiple data streams into an optimized corpus that is then deployed to Snowflake for real-time analytics.

Rapid Health Pro

I ran the team that built a suite of applications to support the delivery of medical equipment and services to consumers in the US. These applications had independent web front ends containing generated content tailored to a customer's specific location and needs. The application was built using Django/Python for the back end and was deployed in AWS via Docker containers and a PostgreSQL application database with a custom-designed schema. The web back end integrated via APIs with billing, scheduling, address verification and fulfillment services, and with custom internal systems that provided eligibility and cross-product services.

SCIPHER

https://www.eversana.com/products/actics/

I acted as the lead architect and manager of the team that built SCIPHER, a web-based SaaS cloud application that allows brand managers to quickly run canned analytics on claims and EMR data while giving data scientists a platform to run custom AI/ML models. The application was deployed on AWS using a Vue.js front end and C# .NET back end, used PostgreSQL for application data and Snowflake for warehouse data, and ran AI/ML models using Python in Docker containers.

PRDICT

I was the primary front and back-end developer and ultimately hired the rest of the development team that built PRDICT, a web-based application designed and built in collaboration with a Fortune 500 client. PRDICT enables users with no data science background to run predictive analytics on Share of Conversation, based on models that tie custom ontologies with multiple social media corpora. The application was built and deployed on the AWS public cloud using a React front end and Python and Django back end, used PostgreSQL for application data storage, Neo4j for graph database storage, and ran ontology mappings and predictive analytics asynchronously using a dedicated pool of EC2 VMs running multiple Python processes.

EDGEHome

I designed and wrote most of the firmware and controller software for the EDGEhome home automation solution. EDGEhome provides consumers with real-time energy monitoring and control of every home electricity usage point through a modern and intuitive user interface. The system comprises low-cost wireless devices that replace the home's outlets, switches, and electrical boxes. A wall-mounted tablet and mobile apps allow homeowners to conveniently monitor and control electrical usage and lighting throughout their home.

As the head of software engineering, I had the final responsibility to create and execute the software product roadmap for the EDGEhome home automation portfolio. I designed, implemented, and tested the device software, including modules for device discovery and provisioning, message routing, firmware upload, software image management, message encryption, and device authentication. In addition, I implemented Agile software methodology, repeatable build practices, and automated test frameworks across all of the various code bases we used.

Education

2000 - 2002

Master's Degree in Computer Science

DePaul University - Chicago, IL, USA

1990 - 1994

Bachelor's Degree in Computer Engineering

Carnegie Mellon University - Pittsburgh, PA, USA

1990 - 1994

Bachelor's Degree in Electrical Engineering

Carnegie Mellon University - Pittsburgh, PA, USA

Skills

Libraries/APIs

React, Node.js, JavaScript Charting, REST APIs, Windows API, API Development, D3.js, Vue, jQuery, Windows Forms (WinForms), Python Asyncio, PySpark, Web3.js, React Redux, Pandas, Google Maps

Tools

Git, JSX, GitHub, Bitbucket, Jira, Slack, Confluence, Pytest, pylint, Figma, MQTT, Auth0

Languages

Python, JavaScript, C, C#, Snowflake, SQL, TypeScript, C++, CSS, HTML, Embedded C, HTML5, C#.NET, Java, Assembly, PHP, Embedded C++, GraphQL, SCSS

Frameworks

Django, .NET, ASP.NET Core MVC, Flask, ASP.NET, Blazor, Selenium, Next.js, .NET Core, Windows Presentation Foundation (WPF), Material UI, Tailwind CSS, Qt, Cypress, Redux

Paradigms

Unit Testing, Agile Software Development, ETL, Microservices, Test-driven Development (TDD), HIPAA Compliance, Low-code Development

Platforms

Windows, Docker, AWS Lambda, Amazon Web Services (AWS), Raspberry Pi, Databricks, Linux, Oracle, Azure, Embedded Linux, Android, Mapbox, AWS IoT, WordPress, Google Cloud Platform (GCP)

Storage

Databases, MySQL, Database Architecture, Data Integration, PostgreSQL, Microsoft SQL Server, Master Data Management (MDM), Neo4j, Elasticsearch, Data Lakes

Industry Expertise

Healthcare, Project Management

Other

Electrical Engineering, Distributed Systems, Full-stack, Back-end, Embedded Systems, SaaS, Leadership, Full-stack Development, Charts, Front-end, APIs, Optimization, Telecom Equipment & Solutions, API Integration, Architecture, Software Design, Legacy Code, Legacy Software, Integration, Microcontrollers, CI/CD Pipelines, Mathematics, SOLID Principles, Web Development, Technical Leadership, Responsive Web Apps, Firmware, CTO, Team Leadership, Data Architecture, UI Development, Software Architecture, Medical Software, Data Visualization, Multithreading, Data Engineering, Big Data, Lambda Functions, Internet of Things (IoT), Data Processing, Networking, Algorithms, Scalability, Large-scale Projects, Startups, Data Structures, Advisory, Engineering, Process Development, Coaching, Cloud Architecture, Embedded Software, TCP/IP, Data Strategy, Data Monetization, ICD-10, Analytical Dashboards, Data-driven Dashboards, Interactive Dashboards, Web Dashboards, Interactive UI, Computer Engineering, MSP430, Minimum Viable Product (MVP), Microsoft Azure, Healthcare & Insurance, Mobile Advertising, Smart Homes, Fintech, Technical Writing, Writing & Editing, Progressive Web Applications (PWAs), Migration, Hardware Drivers, Data Analysis, Data Scraping, Web Scraping, Software QA, Customer Relationship Management (CRM), Data Mining, ETL Tools, Technical Documentation, IoT Protocols, Dashboards, eCommerce, Marketplaces, Bots, IT Security, Big Data Architecture, Data Governance, HIPAA Electronic Data Interchange (EDI), Animated Interactive Graphs, BI Reporting, 5G, Low Code, Bitcoin, Natural Language Processing (NLP), Localization, Yocto, QA Automation, Hardware, Generative Pre-trained Transformers (GPT), Abstract Syntax Trees (AST), Geolocation, Mapping, Data Science, Data Build Tool (dbt)

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