Sergei Mostachev-Full Stack Developer
Check rate
Experience
Full Stack Developer
Front Desk Helpers
- Development and support of web applications.
- Integration of services into CRM.
- Outstaff.
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.
Senior Web Programmer
Information technology and knowledge
Full Stack developer
Princip Company
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology and Retail.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, and 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
Education
Smolensk Industrial-Economic College
Senior Technician · Computer and Automated Systems Software · Smolensk, Russian Federation
Certifications & licenses
1C-Bitrix
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Sergei is based in Smolensk, Russian Federation and prefers 100% remote projects.
Sergei speaks the following languages: Russian (Native), English (Advanced).
Sergei has at least 14 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 5 months. Note that Sergei may not have shared all experience and actually has more experience.
Based on recent experience, Sergei would be well-suited for roles such as: Full Stack Developer, CIO, Senior Web Programmer.
Sergei's most recent position is Full Stack Developer at Front Desk Helpers.
In recent years, Sergei has worked for Front Desk Helpers.
Sergei is most experienced in industries like Information Technology and Retail.
Sergei is most experienced in business areas like Information Technology, Product Development, and Project Management.
Sergei has recently worked in industries like Information Technology.
Sergei has recently worked in business areas like Information Technology and Product Development.
Sergei attended Smolensk Industrial-Economic College for Computer and Automated Systems Software.
Sergei has 1 certificate: 1C-Bitrix.
The availability of Sergei needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 25 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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