Open to opportunities

Sayem Khan

@sayemkhan

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Senior software engineer building product features and microservices across Rails, Node, and React.

United States

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What I'm looking for

I’m looking for a team where I can build and ship full product features end-to-end—backend services, APIs, and polished frontends—using modern Rails/Node/React, with room to own architecture and improve developer and user experience.

I’m a Senior Software Engineer who’s built core product features across virtual data room solutions, real estate marketplaces, and healthcare platforms—shipping backend logic, frontend functionality, and microservices that support real user needs. My work spans Ruby on Rails, Node.js, Postgres/MySQL, and modern UI frameworks like React, Angular.js, and Vue.js.

Recently at CapLinked, I built virtual data room solutions and added workspace enhancements like user watermarks, workspace notifications, and redactions for uploaded documents. Previously at Entera, I developed services and API updates for proforma calculations using Amazon SQS, AWS Lambda, and DynamoDB, and at Doximity I architected microservices for enterprise healthcare applications.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

CapLinked

Aug 2021 - Apr 2026 (4 years 8 months)

Built core features of CapLinked, including virtual data room solutions for financial institutions, using Ruby on Rails, Node.js, Postgres, and Angular.js. Developed workspace/folder tools and built a file redaction tool using Vue.js.

Ruby on Rails Ruby Node.Js Development Sidekiq RSpec Angular Vue.Js HTML CSS Docker Git

Senior Software Engineer

Entera

Mar 2020 - Jul 2021 (1 year 4 months)

Built core features of Entera, a real estate marketplace for single family homes, using Ruby on Rails and React.js. Developed backend snapshot calculation tooling with Amazon SQS, AWS Lambda, and DynamoDB, and implemented related front-end functionality with React.js.

Ruby on Rails Ruby Sidekiq RSpec MySQL React HTML CSS Docker Git Amazon SQS AWS Lambda DynamoDB

Owner & Developer

Copa Digital Group

Aug 2016 - Dec 2019 (3 years 4 months)

Provided full-service web and mobile app development and design consultancy specializing in Ruby on Rails, Node.js, React.js, Angular.js, and mobile development with Swift and Objective-C. Served clients including Ordway Labs, PayRent, Dollar General, and Itemize.

Ruby on Rails Node.Js Development React Angular Swift Objective C MySQL HTML CSS

Software Engineer

Doximity

Mar 2015 - Jul 2016 (1 year 4 months)

Built core features and applications for Doximity using Ruby on Rails, Node.js, MySQL, React.js, Backbone.js, and JavaScript. Built and architected microservices to support enterprise healthcare software, including the Colleagues and Colleague Connect applications.

Ruby on Rails Ruby Node React Backbone.Js CoffeeScript JavaScript Elasticsearch Redis MySQL CSS Git

Frontend Engineer

Zeeto Media

Feb 2013 - Feb 2015 (2 years)

Built and designed Zeeto Media’s Path Manager (PM), an in-house proprietary advertising and reporting platform, using Node.js, Express, Jade, jQuery, Twitter Bootstrap, and Highcharts. Added ongoing features for sales, media buying, metrics, web analytics, custom reporting, and UI improvements.