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Trusted Software Development Partner Since 2007

OS-System provides custom software, web and mobile development for startups and established businesses.

Since 2007, we have built digital products, business applications, and cloud-based platforms, supporting clients from initial development through ongoing improvements and maintenance.

Services:

  • Min project size
    $25,000+
  • Hourly rate
    $25 - $49 / hr
  • Employees
    10 - 49
  • Year founded
    Founded 2007

Overview by:

Reviewer avatar
Oleh Sieroochenko

Select Focus Area
Application Platforms
Linux server
40%
Amazon Application Development Framework
30%
Windows server
20%
Other app platform
10%
AWS Consulting Services
AWS DevOps
50%
AWS Applications
25%
AWS Development
25%
Azure Consulting Services
Azure Development
65%
Azure DevOps
25%
Azure Migrations
10%
Frameworks and CMS
Oracle Application Development Framework
10%
Programming & Scripting
PHP
30%
Java
10%
SQL
10%
Industries
Education
15%
Medical
15%
Advertising & marketing
10%
Business services
10%
Information technology
10%
Real estate
10%
Supply Chain, Logistics, and Transport
10%
Telecommunications
10%
eCommerce
10%
Clients
Small Business (<$10M)
60%
Midmarket ($10M - $1B)
30%
Enterprise (>$1B)
10%

Pricing Snapshot

Min. project size $25,000+
Avg. hourly rate $25 - $49 /hr
Rating for cost 4.7 /5

What Clients Have Said

OSSystem offers competitive pricing, with project costs ranging from $5,000 to $250,000 depending on client needs. Clients consistently highlight their strong value for cost, excellent communication, and timely delivery, making them a reliable partner for various software development projects.

This summary is based on verified Clutch reviews.

Most Common Project Size

$50,000 - $199,999 based on 12 reviews
< $10,000 $10,000 - $49,999 $50,000 - $199,999 > $200,000

Select a service to see pricing information

Highly Rated Similar Providers

OSSystem Review Insights

Overall Review Rating

4.9
  • Quality 4.8
  • Schedule 4.8
  • Cost 4.7
  • Willing to Refer 4.8

Top Mentions

Review Highlights

  • Commitment to Problem Solving

    The team at OSSystem is recognized for their problem-solving capabilities, often going beyond expectations to ensure project success. Their ability to address unforeseen issues effectively is a notable strength.

  • Excellent Communication Skills

    OSSystem is frequently commended for their outstanding communication. Clients appreciate their transparency, availability, and proactive updates, which foster a collaborative and seamless workflow.

  • Proficiency in Diverse Technologies

    OSSystem has demonstrated a strong ability to work with a wide range of technologies including React, Node.js, Java, AWS, MongoDB, and more. Clients have praised their technical expertise across various projects, from mobile app development to complex backend systems.

  • High-Quality Deliverables

    OSSystem consistently delivers high-quality work that meets or exceeds client expectations. Projects such as data visualization apps and mobile applications have received positive feedback for their functionality and user-friendly designs.

  • Effective Project Management

    Multiple reviews highlight OSSystem's effective project management, with clients noting their timeliness, responsiveness, and organized approach. They use tools like Slack, Jira, and monday.com to maintain clear communication and ensure projects stay on track.

  • Areas for Improvement: Time Zone Challenges

    Some clients have experienced challenges due to time zone differences, which occasionally required late-night communications. However, OSSystem's willingness to adapt and be available mitigates this issue to some extent.

OSSystem Reviews

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Services
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Industry
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Backend Database & Frontend Support for Biotechnology Co

  • Enterprise App Modernization UX/UI Design Web Development
  • Linux server
  • $50,000 to $199,999
  • Jan. 2022 - Feb. 2024
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0
"We are happy with OSSystem and would work with them again."
Jan 30, 2024
Executive, Psivant Therapeutics
Anonymous
Verified
  • Other industries
  • Boston, Massachusetts
  • 11-50 Employees
  • Online Review
  • Verified

OSSystem has built a custom backend database for a biotechnology company. The team developed a frontend web interface to manage compounds, track data, analyze results, and drive the client's decision-making.

UI Design for Enterprise Software Firm

  • Enterprise App Modernization UX/UI Design Web Development
  • HTML5 JavaScript Other programming & scripting languages
  • Confidential
  • Apr. 2023 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"OSSystem has provided timely communication and collaboration."

Sep 20, 2023
Director of Software Engineering, Enterprise Software Firm
Anonymous
  • Other industries
  • Red Bank, New Jersey
  • 51-200 Employees
  • Online Review

OSSystem has modernized the UI of an enterprise software firm's website. They've used modern frameworks, architectural patterns, technologies, and processes to update the UI design.

Cross-Platform Mobile App Development for Medical Center

  • Application Testing Mobile App Development
  • Flutter
  • $10,000 to $49,999
  • Jan. 2021 - Ongoing
4.5
Quality
4.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.0

"They have excellent communication"

May 17, 2023
CEO, MC Ingo
Kudriavcev Hrigorii
  • Other industries
  • Kyiv, Ukraine
  • 201-500 Employees
  • Online Review

OSSystem has helped a medical center develop a cross-platform mobile app, integrating it with a medical CRM system. They've also added video communication and remote consulting features.

Custom Software Development for Digital Agency

  • Custom Software Development
  • $50,000 to $199,999
  • Jan. 2018 - Ongoing
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"They are an outstanding, trustworthy partner."

Nov 18, 2020
Founder, Digital Agency
Anonymous
Verified
  • Other industries
  • Dallas, Texas
  • 1-10 Employees
  • Online Review
  • Verified

A digital agency hired OSSystem to take over a development project that was leftover from a previous vendor. The goal is to complete the project and make it better.

Software Development for Social Mind Mapping Platform

  • Custom Software Development
  • $50,000 to $199,999
  • Sep. 2019 - Ongoing
4.5
Quality
4.0
Schedule
5.0
Cost
4.0
Willing to Refer
4.5

"The capacity to act to unforeseen problems impressed us."

Apr 6, 2020
CEO, Linkfacts S.A.
Hubert Schumacher
Verified
  • Information technology
  • Luxembourg
  • 1-10 Employees
  • Online Review
  • Verified

OSSystem developed a social mind mapping platform. The team provided both front- and backend development services, working in Angular 8 and Java.

Mobile App Development Updates for Dating App

  • Mobile App Development
  • Less than $10,000
  • Aug. - Nov. 2018
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Willing to Refer
5.0

"OSSystem’s background in our core technologies is what we were looking for in a partnership."

Nov 18, 2018
CEO & Co-Founder, Dating App
Anonymous
Verified
  • Information technology
  • Zuerich, Switzerland
  • 1-10 Employees
  • Online Review
  • Verified

OSSystem was a development partner for an updated dating application. Their team updated the framework and added new features. They also performed routine testing and bug fixes.

Showing 11-16 of 16 Reviews

Our Story

OS-System is a Ukrainian software development company founded in 2007. Our team of 40+ engineers, designers, QA specialists and project managers has delivered web, mobile, IoT and cloud products for startups and growing businesses worldwide, from healthcare to education and agriculture. We believe in teams, not stars: we share knowledge, plan ahead and take ownership of results, and we stay with our clients long after launch.

Meet the Team

Oleh Sieroochenko

Oleh SieroochenkoCEO

Oleh founded OS-System in 2007. As CEO, he oversees projects from planning to delivery, prioritizing clear, transparent communication, regular updates, close client collaboration, and alignment with business goals.

What Sets Us Apart

End-to-end product development

We take a product from the first idea to a live release and keep supporting it afterwards. Design, web and mobile development, cloud, testing and support all sit under one roof, so you work with one team instead of juggling several vendors.

We understand your industry

We have delivered 120+ projects across MedTech, EdTech, AgriTech, IoT, real estate, legal tech and media. We bring practical knowledge of how these businesses work, so we ask the right questions early and shape the product around your users, not just the specification.

Open, honest communication

Our clients always know where the project stands and where the budget goes. We flag risks early, say so when something won't work, and suggest better options before they turn into challenges. We provide transparent communication and a comfortable working-hours overlap for different timezones.

Contact OSSystem

If you’re not seeing exactly what you need here, send this company a custom message. You can talk about your project needs, price, and timeline to get started on your project.

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