I’m a Senior Software Developer with 19+ years of experience building web products and bespoke applications that meet real business needs. I’m fluent in English and speak Russian, Ukrainian and Spanish as well. I enjoy mentoring fellow developers, sharing best practices, and working with Agile methodologies. I thrive on learning new technologies and guiding teams to deliver high-quality software. Certified Holacracy Lead Link/Rep Link/ Facilitator/ Secretary, I lead multi-disciplinary teams and architect scalable systems. I’m comfortable taking customer requirements and turning them into solid technical roadmaps and collaborative workflows that empower teams to perform at their best.

Denis Mamayef

I’m a Senior Software Developer with 19+ years of experience building web products and bespoke applications that meet real business needs. I’m fluent in English and speak Russian, Ukrainian and Spanish as well. I enjoy mentoring fellow developers, sharing best practices, and working with Agile methodologies. I thrive on learning new technologies and guiding teams to deliver high-quality software. Certified Holacracy Lead Link/Rep Link/ Facilitator/ Secretary, I lead multi-disciplinary teams and architect scalable systems. I’m comfortable taking customer requirements and turning them into solid technical roadmaps and collaborative workflows that empower teams to perform at their best.

Available to hire

I’m a Senior Software Developer with 19+ years of experience building web products and bespoke applications that meet real business needs. I’m fluent in English and speak Russian, Ukrainian and Spanish as well. I enjoy mentoring fellow developers, sharing best practices, and working with Agile methodologies. I thrive on learning new technologies and guiding teams to deliver high-quality software.

Certified Holacracy Lead Link/Rep Link/ Facilitator/ Secretary, I lead multi-disciplinary teams and architect scalable systems. I’m comfortable taking customer requirements and turning them into solid technical roadmaps and collaborative workflows that empower teams to perform at their best.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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Language

English
Fluent
Russian
Advanced
Ukrainian
Advanced
Spanish; Castilian
Intermediate

Work Experience

Front-end Developer (React), Development Team Lead, Senior Software Developer, Front-end Architect, Chrome Extension Developer
February 1, 2020 - Present
Developed React front-end for an A/B testing SAAS, wrote specs, led multiple teams, and supervised code style and project architecture. Delivered three large front-end projects (migration to React, a new visual editor, and a report builder). Maintained and upgraded a Chrome extension. Organized and led three teams; performed code reviews and architecture control.
Front-end Developer
June 1, 2025 - Present
Developed independent MVP front-end for an interior decoration 3D modeling SaaS; built a Next.js / TypeScript / React / MUI serverless front-end; created a browser-based 3D preview akin to 3DS Max for efficient design workflows.
Development Team Lead, Senior Software Developer, Front-end Developer (React), Solidity Developer, Android App Developer, PHP Backend, DevOps, Chrome Extension Developer at JonnyBlockchain.com
November 1, 2018 - Present
UK-based cryptocurrency startup. Responsibilities included requirements gathering, writing specs, architecture planning, hiring, and team leadership. Built data ingestion from 73 exchanges; designed scalable crypto-trading services; migrated API from PHP to Python/Django; managed servers and DevOps; delivered real-time features via websockets.
Development Team Lead, Senior Software Developer at Zukul / Binary Options
July 1, 2017 - November 1, 2018
Translating customer ideas into technical specs; defining project architecture and plan; managing deadlines; supervising code and architecture; implementing features for robots; integrating with third-party APIs.
Senior Software Developer at Zukul Crypto Trading Robots
January 1, 2015 - July 1, 2017
Implemented project specs; architecture; background crypto trading bots interfacing via websockets; built a professional trading interface; led development efforts.
Senior Full-Stack PHP Developer at Matrix Systems Ltd.
March 1, 2013 - December 1, 2014
Built a marketing suite with multiple tools; integrated an MLM network; organized teamwork and SCRUM adoption; acted as product owner and architect.
Senior PHP Developer at Ecomplementary Ltd.
January 1, 2011 - March 1, 2013
Developed MissQ's bar ticketing system, Hale Clinic online booking and management, Flore Retreat online booking and payment, Silverstone Classic ticketing, and other projects; integrated multiple payment systems.
Project Manager, Team Lead, Senior Full-Stack PHP Developer at Z-Three Ltd.
December 1, 2009 - January 1, 2011
Gauged business needs on-site, built backbone online system, hired and managed a distributed development team; led SCRUM-style workflow and rapid screen delivery.
Technical Director / Senior PHP Developer at Mywebfactory Ltd.
January 1, 2006 - December 31, 2009
Progressed from developer to Technical Director in 3.5 years; introduced Zend standards; contributed to hiring and coding culture; tackled front-end HTML/CSS tasks and established documentation standards.

Education

Bachelor of Computers and Information Systems at Kharkiv Aviation Institute - National Aerospace University, Ukraine
September 1, 1997 - July 1, 2001
Bachelor of Computers and Information - Networks and Complex Systems at Nizhny Novgorod State Technical University, Russia
September 1, 2001 - July 1, 2004

Qualifications

Certified Holacracy LeadLink / RepLink / Facilitator / Secretary
January 11, 2030 - January 4, 2026

Industry Experience

Software & Internet, Financial Services, Professional Services, Media & Entertainment, Telecommunications

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
See more