Joshua Osenbaugh
Toledo, OH
419-349-8811
josh@osenbaugh.xyz
Summary
Senior Backend Software Engineer with experience architecting scalable APIs, event-sourced systems, and real-time distributed applications. Proven background leading backend initiatives processing millions of events per day and deploying low-latency machine learning systems with sub-10ms inference in production. Experienced in RESTful API design, MySQL and MSSQL data modeling, AWS infrastructure, Docker-based deployments, and CI/CD automation. Strong track record of owning architectural decisions, collaborating with product stakeholders, and delivering reliable, high-performance backend systems.
Experience
Senior Backend Software Engineer
PhoneBurner | Remote
07/2021 – Present
- Architected and solely owned the design and production deployment of a real-time RNN classification system using TensorFlow (Python for training, C for production inference), delivering sub-10ms latency predictions on streaming data in AWS.
- Led backend architecture for three event-sourced systems using EventSauce and MySQL, processing millions of events per day across outbound dialing and phone number lifecycle management platforms.
- Designed and built 20+ RESTful HAL-based APIs serving internal and external customers, implementing hypermedia-driven discoverability and scalable MySQL-backed persistence layers.
- Served as technical lead and primary backend engineer across multiple initiatives, acting as the main engineering contact for product stakeholders and guiding architectural decisions through delivery.
- Architected and implemented telephony integrations via Twilio and direct SIP integrations with Asterisk and FreeSWITCH, working directly with major telecom providers.
- Built and maintained Dockerized services deployed in AWS, implementing CI/CD pipelines using GitHub Actions to support continuous delivery.
- Enforced high engineering standards through unit, integration, and behavioral testing across distributed backend systems.
Software Engineer
Shared Services | Remote / Northwood, OH
08/2018 – 07/2021
- Designed and implemented customer-facing and internal RESTful APIs using PHP (Symfony) and Microsoft SQL Server, supporting mid-scale ISP systems serving the Toledo metropolitan area.
- Contributed to the architectural design and modernization of backend systems, including greenfield development and refactoring of legacy applications.
- Built and maintained automated provisioning systems for high-speed data and VoIP modem deployments, supporting fully automated service activation workflows.
- Introduced and implemented CI/CD pipelines using Bamboo, containerizing applications with Docker and deploying to on-premise infrastructure.
- Participated in a 24/7 on-call rotation supporting production systems, troubleshooting critical service and provisioning issues affecting city-scale customers.
- Mentored junior engineers and served as a technical escalation point for complex backend and infrastructure issues.
- Collaborated across engineering teams to deliver API-driven service management and deployment solutions.
VB.Net Programmer
The William Fall Group | Toledo, OH
02/2018 – 08/2018
- Developed and maintained VB.Net web applications backed by Microsoft SQL Server for internal enterprise systems.
- Designed database queries and implemented backend business logic to support reporting and operational workflows.
- Maintained and updated corporate web assets using HTML and CSS.
- Provided technical support and troubleshooting for internal software systems.
After School Teacher
Toledo Smart Bilingual Elementary | Toledo, OH
08/2013 – 02/2018
- Taught foundational programming concepts using Scratch and LEGO Mindstorms robotics kits.
- Developed structured lesson plans introducing logic, problem-solving, and basic software development principles.
Skills
Languages & Frameworks:
Python, C, PHP (Symfony), JavaScript, TypeScript
Web & Markup:
HTML, CSS
Databases:
MySQL, MSSQL
Backend & Architecture:
Distributed System Design, Event Sourcing, API Design, Middleware, Frameworkless Platform Architecture
Infrastructure & DevOps:
AWS, Docker, CI/CD, GitHub Actions, Bamboo
Specialized Systems:
Telephony (Twilio, SIP, Asterisk, FreeSWITCH), Real-time Communication via Server-Sent Events, ML Low-Latency Systems Design, Machine Learning, TensorFlow
Education
The University of Toledo
Computer Science Engineering and Technology
05/2018 | Toledo, OH
Honors and Awards
Business Professionals of America Competitions
Mobile Application Development * National 4th Place 2012, 2013 * State 1st Place 2012, 2nd 2013 * Regional 1st Place 2012, 2013
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