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Douglas ManzelmannDM
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Douglas Manzelmann

@douglasmanzelmann

I build high-scale cloud services and event-driven backend platforms.

United States
Message

At Movable Ink, I lead core rendering and behavioral-service work, including a multi-year JavaScript-to-TypeScript migration for a service handling 100,000 to 550,000+ requests per second. I also replaced Express-style middleware with Fastify hooks, improved cache behavior for customer API data, and contribute to migrations from NSQ to Pulsar.

I've built full-stack and cloud platforms at Volta Charging, Momentum Dynamics, The Washington Post, and the National Center for Missing & Exploited Children. My work spans AWS and GCP, Node.js, TypeScript, Java, distributed systems, IoT, streaming, infrastructure as code, and customer-facing applications.

Experience

Work history, roles, and key accomplishments

Movable Ink logoMI
Current

Senior Software Engineer

Jan 2023 - Present (3 years 8 months)

- Replaced Express-style middleware with Fastify hooks across request lifecycle (logging, UUID generation, query params, body limits, security headers, response methods) for our core rendering service
- Led a systematic, multi-year conversion of our core content rendering service from javascript to typescript which serves anywhere from 100,000 requests per second to 550,000+ on the Black Friday /

Volta Charging logoVC

Senior Software Engineer

Sep 2021 - Dec 2022 (1 year 3 months)

Member of the cloud team

Tech:
- NodeJS, typescript, fp-ts, knex, jest
- Apollo GraphQL
- AWS Lambda, DynamoDB, RDS PostgreSQL, SNS, SQS,
- Pulumi for IaC

Momentum Dynamics logoMD

Senior Software Engineer

Nov 2020 - Sep 2021 (10 months)

- Full-stack software engineer responsible for all of Momentum Dynamics cloud software and architecture.
- First software developer brought on to create web services and applications for customer and operations products, predictive analytics, operational metrics, alerting, for wireless electric vehicle charging systems in the U.S. and western Europe.
- Transitioned applications hosted and manually

The Washington Post logoTP

Senior Software Engineer

Jul 2018 - Nov 2020 (2 years 4 months)

-Full-stack software engineer; worked on a large Spring MVC application for the Arc Publishing video platform, which includes VOD and Live video functionality.
-Database: MongoDB
-Used Node.js to clean up the database and for ETL tasks
-Backend: Java (8), Spring, Spring MVC, Spring Data
-AWS: CloudFormation, EventBridge, SQS, SNS, ECS, S3, CloudFront, Elemental Media Services (MediaLive, MediaPac

National Center for Missing & Exploited Children logoNC

Software Engineer

May 2016 - Jul 2018 (2 years 2 months)

-Full-stack software engineer, working on tasks a variety of tasks on middle/high volume applications.
-RDBMS / NoSQL – MySQL and Apache Solr
-MySQL work sometimes included ETL tasks writing stored procedures
-Backend: Java, Spring, Spring MVC, Spring AMQP (RabbitMQ), etc.
-Frontend: Vanilla JavaScript (ES6), jQuery, JSPs
-Began to horizontally scale out services from a modular monolith to microse

ActioNet, Inc. logoAI

Software Developer

Jan 2016 - May 2016 (4 months)

-Created an automated test framework using Cucumber JVM, Selenium WebDriver, Google Guice, Junit, REST-assured, Allure Reporting Framework and MyBatis with integration into Atlassian Bamboo.
-Created a simple React.js client to query REST endpoints.

Booz Allen Hamilton logoBH

Junior Software Developer

Aug 2015 - Dec 2015 (4 months)

-Created an Acceptance Testing framework using Cucumber JVM and Selenium Web Driver.
-Created a custom Microsoft Excel parser using Apache POI, serialized the Excel file (200 spreadsheets) to YAML, CSV, Gherkin (Cucumber scenario syntax).

Hogan Lovells logoHL

Audio/Visual Specialist

Mar 2011 - May 2013 (2 years 2 months)

Worked as Audio/Visual Specialist at Hogan Lovells.

The Baltimore Sun logoTS

Editorial Intern

Jan 2009 - May 2009 (4 months)

Worked as Editorial Intern at The Baltimore Sun.

Education

Degrees, certifications, and relevant coursework

UC

University of Maryland Global Campus

Bachelor of Science (B.S.), Computer Science

2013 - 2015

University of Maryland Global Campus logoUC

University of Maryland Global Campus

Bachelor of Science, Computer Science

2013 - 2015

Pursued a Bachelor of Science in Computer Science, focusing on software development and systems.

UC

University of Maryland Baltimore County

Bachelor of Arts, English Literature

2004 - 2009

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