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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.…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

Front-End Developer, Back-End Developer, Full Stack Developer, +1

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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.…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.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

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.