Open to opportunities

Marcus Mitchell

@marcusmitchell1

Message

Senior Software Engineer building production-grade SaaS platforms with AI integrations.

United States

Message

What I'm looking for

I’m looking for a senior role where I can design scalable SaaS, lead secure backend/frontend architecture, optimize performance, and integrate AI APIs—collaborating in Agile teams and mentoring engineers.

I’m a Senior Software Engineer with 10+ years of experience building and operating production-grade SaaS platforms. I focus on designing scalable, secure, and maintainable systems, and I bring deep expertise across TypeScript, C#, Python, and Ruby on Rails.

In my recent role, I led the design and development of SaaS marketplace services using TypeScript, Node.js (Express, NestJS), and React/Next.js. I architected backend APIs and microservices with C# (ASP.NET Core, .NET Core) and Python (Django, FastAPI), integrating AI APIs (OpenAI, Anthropic) to improve platform intelligence and user experience.

I build strong data layers with PostgreSQL, SQL Server, and MongoDB, using Supabase for real-time data and authentication, and event-driven workflows with RabbitMQ and Kafka. I also deploy and manage infrastructure on AWS, Azure, and Firebase, using Docker and Kubernetes for container orchestration and scalability.

I care about quality and reliability, establishing CI/CD pipelines with GitHub Actions, Jenkins, and CircleCI and implementing comprehensive unit, integration, and end-to-end testing with Jest, Pytest, and xUnit. I strengthen web security with OAuth2.0/OIDC, JWT, and data encryption, and I mentor junior engineers while aligning technical execution with business goals.

Experience

Work history, roles, and key accomplishments

Current

Senior Full-Stack Software Engineer

Current

Taskrabbit

Jun 2023 - Present (2 years 10 months)

Led design and development of scalable SaaS marketplace services, building backend APIs/microservices and React/Next.js user workflows. Architected data layers and event-driven integrations with RabbitMQ/Kafka, deployed on AWS/Azure/Firebase with Docker/Kubernetes, and strengthened security using OAuth2/OIDC/JWT while mentoring teams and optimizing performance.

TypeScript NestJS React Next.js ASP.NET Core RabbitMQ

Senior Full-Stack Software Engineer

Groopit

Jan 2021 - May 2023 (2 years 4 months)

Developed and maintained collaborative SaaS features using Ruby on Rails, React, and TypeScript, including AI-powered functionality with OpenAI APIs. Built backend services with REST/GraphQL using Node.js/Express and FastAPI, managed deployments on AWS/Firebase with Docker/Kubernetes, and implemented CI/CD and OAuth2/JWT security best practices.

Ruby on Rails React TypeScript OpenAI API Node Express fastAPI PostgreSQL MongoDB

Full Stack Engineer

Geocaching

Mar 2018 - Dec 2020 (2 years 9 months)

Built and modernized web platform features using Angular, TypeScript, and Ruby on Rails, delivering backend APIs and microservices. Implemented real-time data flows with Kafka/RabbitMQ, managed AWS/Azure infrastructure with Docker/Kubernetes and CI/CD, and supported security (OAuth2/JWT) and scalability improvements.

Angular TypeScript Ruby on Rails Express Kafka RabbitMQ Docker Kubernetes

Software Developer

Explore Consulting (RSM US LLP)

Jun 2015 - Feb 2018 (2 years 8 months)

Delivered custom SaaS and enterprise solutions by building REST/GraphQL APIs, implementing OAuth2/JWT authentication and authorization, and designing optimized data models. Deployed and managed AWS/Azure infrastructure using Docker/Kubernetes and Infrastructure as Code, established CI/CD automation, and contributed to security/performance reviews while mentoring junior engineers.

C# .NET Ruby on Rails GraphQL APIs OAUTH2 PostgreSQL SQL Server MongoDB Docker Kubernetes