Stepan Zastupov

Product focused software engineer with 14 years of experience. Built and shipped dozens of projects, led and mentored teams. Have a solid understanding of technology and development process on multiple levels. Care deeply about simplicity, design, remote culture and the impact software can make.

Portfolio | GitHub | LinkedIn


Senior Software Engineer

October 2020 - Present

Sphere Knowledge

Senior Software Engineer

February 2019 - October 2020

Small but ambitious startup in social and knowledge space I can't talk much about (yet).


Lead Developer & Architect

May 2017 - February 2019 (1 year 10 months)

SpeakApp is an attempt to re-imagine messaging with voice-first UI and speech transcription.

I was leading a full stack development team responsible for design and implementation of APIs, backend services, infrastructure, web client, landing pages and internal tools. I was also contributing to company processes, knowledge sharing and cross-team communication.

On the product side, I came up with a few features and prototypes, designed and programmed all voice filters for Prank It!


Senior Software Engineer

December 2015 - May 2017 (1 year 6 months)

As a full stack engineer in a mobile company, I was responsible for web technologies. I designed APIs, created and automated backend services, developed web interfaces.

Projects I worked on:

Dell Software

Senior Software Engineer

September 2014 - September 2015 (1 year)

I was a fullstack developer working on a new platform for data migration products. My primary focus was improving the developer experience of the platform, tuning performance, owning and shipping new features. I was also giving talks, introducing new technologies and practices.

Tegile Systems

Software Engineer Contractor

October 2013 - April 2014 (7 months)

CIFS system maintainance and bug fixes.

DEY Storage Systems

Senior Software Engineer

May 2012 - September 2013 (1 year 5 months)

Our team built from the ground up a complex cloud storage orchestration software. I've contributed to almost every part of the system, but my primary areas of responsibility were APIs and inter-components communication, services and Web UI.

The company was later acquired by Tegile Systems.

Nexenta Systems

Software Engineer

May 2011 - April 2012 (1 year)

I was working on Illumos (OpenSolaris) kernel as a core of Nexenta Storage Plarform. On this role I modified the in-kernel NFS server to work in Solaris zones (OS level virtualization) and made some CIFS stack improvements.

LG Electronics

Software Engineer

April 2010 - May 2011 (1 year 2 months)


Software Engineer

August 2008 - March 2010 (1 year 8 months)

I developed WEB and native (GTK) Linux user interfaces for network management and virtualization software.


Software Engineer

April 2006 - August 2008 (2 years 5 months)

I was working on ISPmanager and VMmanager line of products. I built new backup system, testing framework, ported ISPmanager to Windows, and did initial XEN (virtualization) integration.