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I am an experienced software engineer specializing in Ruby on Rails and full-stack web development. Currently based in New York City, I have built core features and tools for various companies in the financial services and real estate industries, as well as running my own freelance development consultancy. My work often involves modern JavaScript frameworks like React.js, Angular.js, and Vue.js, alongside backend technologies and cloud services. Over the years, I have contributed to key products in venture-backed startups and established companies, delivering scalable and innovative software solutions. I enjoy crafting efficient APIs, developing user-centric frontends, and architecting microservices. I thrive in collaborative environments and take pride in delivering high quality, maintainable code while continuously learning new technologies.…I am an experienced software engineer specializing in Ruby on Rails and full-stack web development. Currently based in New York City, I have built core features and tools for various companies in the financial services and real estate industries, as well as running my own freelance development consultancy. My work often involves modern JavaScript frameworks like React.js, Angular.js, and Vue.js, alongside backend technologies and cloud services. Over the years, I have contributed to key products in venture-backed startups and established companies, delivering scalable and innovative software solutions. I enjoy crafting efficient APIs, developing user-centric frontends, and architecting microservices. I thrive in collaborative environments and take pride in delivering high quality, maintainable code while continuously learning new technologies.

Sayem Khan

Developer, Programmer, Web Developer, +1

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I am an experienced software engineer specializing in Ruby on Rails and full-stack web development. Currently based in New York City, I have built core features and tools for various companies in the financial services and real estate industries, as well as running my own freelance development consultancy. My work often involves modern JavaScript frameworks like React.js, Angular.js, and Vue.js, alongside backend technologies and cloud services. Over the years, I have contributed to key products in venture-backed startups and established companies, delivering scalable and innovative software solutions. I enjoy crafting efficient APIs, developing user-centric frontends, and architecting microservices. I thrive in collaborative environments and take pride in delivering high quality, maintainable code while continuously learning new technologies.…I am an experienced software engineer specializing in Ruby on Rails and full-stack web development. Currently based in New York City, I have built core features and tools for various companies in the financial services and real estate industries, as well as running my own freelance development consultancy. My work often involves modern JavaScript frameworks like React.js, Angular.js, and Vue.js, alongside backend technologies and cloud services. Over the years, I have contributed to key products in venture-backed startups and established companies, delivering scalable and innovative software solutions. I enjoy crafting efficient APIs, developing user-centric frontends, and architecting microservices. I thrive in collaborative environments and take pride in delivering high quality, maintainable code while continuously learning new technologies.

Available to hire

I am an experienced software engineer specializing in Ruby on Rails and full-stack web development. Currently based in New York City, I have built core features and tools for various companies in the financial services and real estate industries, as well as running my own freelance development consultancy. My work often involves modern JavaScript frameworks like React.js, Angular.js, and Vue.js, alongside backend technologies and cloud services.

Over the years, I have contributed to key products in venture-backed startups and established companies, delivering scalable and innovative software solutions. I enjoy crafting efficient APIs, developing user-centric frontends, and architecting microservices. I thrive in collaborative environments and take pride in delivering high quality, maintainable code while continuously learning new technologies.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Software Engineer at CapLinked

August 1, 2021 - Present

Built core features of CapLinked, a virtual data room solution for financial institutions using Ruby on Rails, Postgres, and Angular.js. Developed tools and enhancements such as user watermarks, workspace notifications, and favorited folders. Created a redaction tool for uploaded workspace documents using Vue.js.

Senior Software Engineer at Entera

July 31, 2021 - July 24, 2025

Developed core features of an AI driven real estate marketplace using Ruby on Rails and React.js. Created tools to record financial snapshot calculations for real estate metrics using AWS services like SQS, Lambda, and DynamoDB. Managed logic and API updates for proforma calculations of single family home real estate metrics.

Owner & Developer at Copa Digital Group

December 31, 2019 - July 24, 2025

Ran a full-service web and mobile app development consultancy focused on Ruby on Rails, PHP, Swift, Objective-C, and JavaScript/jQuery. Served clients such as Ordway Labs, PayRent, Dollar General, and Itemize.

Software Engineer at Doximity

July 31, 2016 - July 24, 2025

Built core features and applications for a healthcare startup serving over 60% of US physicians using Ruby on Rails, MySQL, JavaScript, Backbone.js, and React.js. Architected microservices supporting enterprise healthcare software including applications like Colleagues and Colleague Connect.

Frontend Engineer at Zeeto Media

February 28, 2015 - July 24, 2025

Developed and designed Zeeto Media’s proprietary advertising and reporting Path Manager using Node.js, Express, Jade, jQuery, Bootstrap, and Highcharts. Added ongoing features to support sales, media buying, metrics, analytics, and custom reporting.

Senior Software Engineer at CapLinked

August 1, 2021 - Present

Built core features for CapLinked, a virtual data room solution for financial institutions, using Ruby on Rails, Postgres, and Angular.js. Developed enhancements for company workspaces and folders such as user watermarks, workspace notifications, and favorited folders. Created a tool for document redactions using Vue.js.

Senior Software Engineer at Entera

July 31, 2021 - August 11, 2025

Developed core features of the real estate marketplace Entera using Ruby on Rails and React.js. Built a financial snapshot tool with AWS services including SQS, Lambda, and DynamoDB, and implemented front-end React.js functionality. Managed all logic and API updates for proforma calculations of single-family home real estate metrics.

Owner & Developer at Copa Digital Group

December 31, 2019 - August 11, 2025

Provided full-service web and mobile app development and design consultancy specializing in Ruby on Rails, PHP, Swift, Objective-C, and JavaScript/jQuery. Worked with clients such as Ordway Labs, PayRent, Dollar General, and Itemize.

Software Engineer at Doximity

July 31, 2016 - August 11, 2025

Built core applications for Doximity, a healthcare startup used by over 60% of US physicians, leveraging Ruby on Rails, MySQL, JavaScript, Backbone.js, and React.js. Architected several microservices, including Colleagues and Colleague Connect, to support enterprise healthcare software.

Frontend Engineer at Zeeto Media

February 28, 2015 - August 11, 2025

Designed and built Zeeto Media’s proprietary advertising and reporting platform Path Manager using Node.js, Express, Jade, jQuery, Twitter Bootstrap, and Highcharts. Delivered ongoing features including metrics tracking, custom reporting, web analytics, and UI improvements.

Senior Software Engineer at CapLinked

August 1, 2021 - Present

Built core features of CapLinked's virtual data room solutions for financial institutions using Ruby on Rails, Postgres, and Angular.js. Developed tools and enhancements for company workspaces and folders, including adding user watermarks, sending workspace notifications, and enabling favorited folders. Created a tool for adding redactions on uploaded workspace file documents using Vue.js.

Senior Software Engineer at Entera

July 1, 2021 - August 14, 2025

Built core features of Entera, a real estate marketplace for single-family homes, using Ruby on Rails and React.js. Developed a tool for recording financial snapshot calculations of real estate metrics using Amazon SQS, AWS Lambda, and DynamoDB. Built front-end functionality with React.js and managed logic and API updates for proforma calculations of real estate metrics.

Owner & Developer at Copa Digital Group

December 1, 2019 - August 14, 2025

Provided full-service web and mobile app development and design consultancy specializing in Ruby on Rails, PHP, Swift & Objective-C, JavaScript/jQuery. Clients included Ordway Labs, PayRent, Dollar General, and Itemize.

Software Engineer at Doximity

July 1, 2016 - August 14, 2025

Built core features and applications for Doximity, a leading venture-backed healthcare startup used by over 60% of US physicians, employing Ruby on Rails, MySQL, JavaScript, Backbone.js, and React.js. Designed and architected several microservices to support enterprise healthcare software, including colleague-focused applications.

Frontend Engineer at Zeeto Media

February 1, 2015 - August 14, 2025

Built and designed Zeeto Media’s Path Manager, 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, and business needs, including metrics, web analytics, tracking, custom reporting, and UI improvements.