Sergei Mostachev - Full Stack Developer

Q: Where is Sergei based?

Sergei is based in Smolensk, Russian Federation and prefers 100% remote projects.

Q: What languages does Sergei speak?

Sergei speaks the following languages: Russian (Native), English (Advanced) .

Q: How many years of experience does Sergei have?

Sergei has at least 13 years of experience. During this time, Sergei has worked in at least 4 different roles and for 4 different companies . The average length of individual experience is 3 years and 3 months . Note that Sergei may not have shared all experience and actually has more experience.

Q: What is Sergei's latest experience?

Sergei's most recent position is Full Stack Developer at Front Desk Helpers .

Q: What companies has Sergei worked for in recent years?

In recent years, Sergei has worked for Front Desk Helpers and SUWORLD .

Q: Which industries is Sergei most experienced in?

Sergei is most experienced in industries like Information Technology (IT) and Retail .

Q: Which business areas is Sergei most experienced in?

Sergei is most experienced in business areas like Information Technology (IT) , Product Development , and Project Management .

Q: Which industries has Sergei worked in recently?

Sergei has recently worked in industries like Information Technology (IT) and Retail .

Q: Which business areas has Sergei worked in recently?

Sergei has recently worked in business areas like Information Technology (IT) , Product Development , and Project Management .

Recommended expert

Smolensk, Russian Federation

Experience

Apr 2021 - Present

4 years 11 months

United States

Full Stack Developer

Front Desk Helpers

Development and support of web applications.
Integration of services into CRM.
Outstaff.

Apr 2020 - Jun 2021

1 year 3 months

Moscow, Russian Federation

CIO

SUWORLD

Developed SuWorld marketplace platform (online store, referral program, supplier website).
Managed entire technical side of the ecommerce product including development, testing, and technical support processes.
Led product development from scratch.
Managed development teams (internal and two external teams).
Recruited personnel, handled payroll formation and control.
Coordinated budgets and financial reporting.
Set and monitored task execution; analyzed and decomposed business requirements into developer tasks; managed sprints.
Interacted with contractors on external products.
Delivered marketplace with sales of goods and services, and application exchange features.
Oversaw partner offices, supplier offices, administrative panels, and mobile application.
Used technologies: MongoDB, Node.js, Moleculer, TypeScript, GraphQL, React, Vue, REST API, Swagger.
Employed DevOps tools: Docker, Kubernetes, GitLab.
Utilized communication tools: Slack, Zoom.
Used task trackers: Jira, Trello.
Maintained documentation in Confluence.

Jun 2018 - Apr 2020

1 year 11 months

Moscow, Russian Federation

Senior Web Programmer

Information technology and knowledge

Jan 2013 - Jun 2018

5 years 6 months

Russian Federation

Full Stack developer

Princip Company

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (13 years) and Retail (1 year).

Information Technology

Retail

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (13 years), Product Development (11.5 years), and Project Management (1 year).

Information Technology

Product Development

Project Management

Summary

FullStack Developer and Bitrix24 Solutions Architect with 15+ years of experience.

I specialize in deep Bitrix24 customization and CRM automation.

I also integrate Bitrix24 with any third-party system: 1C, Parus, government services (incl. U.S. APIs), SMS/voice providers, WhatsApp, REST/GraphQL/SOAP APIs, and other CRMs.

Currently, I work full-time with a U.S. company (FrontDesk Helpers CO), handling CRM and telephony architecture.

In parallel, I support ongoing Russian projects (90+ hours/month) and take on freelance Bitrix24 automation work.

Open to: consulting, automation projects, CRM/telephony integrations, and long-term Bitrix24-based development.

Skills

Web Development
Crm
Web Project Management
Custom Modules And Components (Cloud And On-premise)
Telephony Integrations: Asterisk, Ari, Ami
Asynchronous Tasks With Rabbitmq
Business Processes, Crm Entities, Bots, And Triggers
Analytics With Bitrix Bi (Superset), Power Bi, And Looker Studio
Integration Of Bitrix24 With Third-party Systems: 1c, Parus, Government Services (Incl. U.s. Apis), Sms/voice Providers, Whatsapp, Rest/graphql/soap Apis, And Other Crms
Tech Stack: Php 8.2, Bitrix D7, Eloquent Orm, Rabbitmq, Vue.js, Node.js, Mysql, Postgresql, Docker, Supervisor

Languages

Russian

Native

English

Advanced

Education

Oct 2008 - Jun 2013

Smolensk Industrial-Economic College

Senior Technician · Computer and Automated Systems Software · Smolensk, Russian Federation

Certifications & licenses

1C-Bitrix

Profile

Created

October 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Sergei based?

Sergei is based in Smolensk, Russian Federation and prefers 100% remote projects.

What languages does Sergei speak?

Sergei speaks the following languages: Russian (Native), English (Advanced).

How many years of experience does Sergei have?

Sergei has at least 13 years of experience. During this time, Sergei has worked in at least 4 different roles and for 4 different companies. The average length of individual experience is 3 years and 3 months. Note that Sergei may not have shared all experience and actually has more experience.

What roles would Sergei be best suited for?

Based on recent experience, Sergei would be well-suited for roles such as: Full Stack Developer, CIO, Senior Web Programmer.

What is Sergei's latest experience?

Sergei's most recent position is Full Stack Developer at Front Desk Helpers.

What companies has Sergei worked for in recent years?

In recent years, Sergei has worked for Front Desk Helpers and SUWORLD.

Which industries is Sergei most experienced in?

Sergei is most experienced in industries like Information Technology (IT) and Retail.

Which business areas is Sergei most experienced in?

Sergei is most experienced in business areas like Information Technology (IT), Product Development, and Project Management.

Which industries has Sergei worked in recently?

Sergei has recently worked in industries like Information Technology (IT) and Retail.

Which business areas has Sergei worked in recently?

Sergei has recently worked in business areas like Information Technology (IT), Product Development, and Project Management.

What is Sergei's education?

Sergei attended Smolensk Industrial-Economic College for Computer and Automated Systems Software.

Does Sergei have any certificates?

Sergei has 1 certificate: 1C-Bitrix.

What is the availability of Sergei?

Sergei is immediately available for suitable projects.

What is the rate of Sergei?

Sergei's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.