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Oles Riaboi's avatar
Oles Riaboi
Kraków, Poland
Senior .NET Developer | ASP.NET Core | Blazor | Desktop
New to Contra
Senior .NET Developer | ASP.NET Core | Blazor | Desktop
Cover image for European Transport Compliance & Rules
European Transport Compliance & Rules Engine As part of a large enterprise ERP system, I developed a specialized rules engine for transportation operations across the European Union. The module automatically determines whether a planned transportation operation complies with applicable regulations, taking into account vehicle characteristics, cargo parameters, routes, countries involved, and specific transportation conditions. The underlying business logic was highly complex, with numerous regulatory rules, exceptions, dependencies, and combinations of operational parameters. Many of these requirements had previously been handled manually, making the process difficult to maintain and creating a significant risk of human error. The solution transformed this complex regulatory knowledge into an automated software-based decision engine. It helped transportation teams identify potentially non-compliant operations before they were executed, significantly reducing the risk of incorrect transportation practices, regulatory violations, and costly fines. The system was implemented as part of a proprietary ERP platform using .NET, MSSQL, WinForms and DevExpress. Due to the confidential nature of the ERP system, the source code and detailed business rules cannot be publicly disclosed.
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Cover image for Automated Transportation Pricing Engine As part
Automated Transportation Pricing Engine As part of a large enterprise ERP system, I developed an automated engine for calculating the cost of transportation orders based on more than 40 business and operational parameters. The pricing calculation involved complex business rules, multiple dependencies between parameters, and a large number of possible combinations. Previously, the calculation was performed using Excel-based processes and could take up to 10 minutes for a single order. I designed and implemented a software-based calculation engine that automated this process and moved the complex pricing logic from manual Excel calculations into a maintainable and executable business rules system. The result reduced the calculation time from up to 10 minutes to approximately 5 seconds per order. Because the solution was developed as part of a proprietary ERP system, the source code and implementation details cannot be publicly disclosed. However, I can discuss the architecture, engineering challenges, optimization approach, and the business logic involved at a high level.
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Cover image for Caffeo (https://caffeo.uno/)was created to
Caffeo (https://caffeo.uno/)was created to solve a problem I experienced firsthand: running a growing network of cafés with fragmented tools, spreadsheets, and systems that were not designed around the realities of day-to-day café operations. Instead of adapting the business to existing software, I built Caffeo around the actual workflows of café owners, managers, and baristas. The platform combines sales, inventory, product costs, employee shifts and payroll, financial reporting, and real-time analytics in a single system. It includes an Android application for point-of-sale operations and a web-based management platform for owners and managers. A key requirement was reliability in real-world conditions. The POS application can continue operating without an internet connection and automatically synchronizes data when connectivity is restored. Caffeo evolved from software used to operate a real café network into a multi-location SaaS platform, designed to give owners a clear view of revenue, costs, inventory, profitability, and day-to-day operations without the complexity of traditional enterprise systems. The product was built through years of direct experience with the business it manages, which allowed the software to evolve around real operational problems rather than hypothetical requirements.
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Cover image for EF Core & XPO Performance
EF Core & XPO Performance Monitoring. ORM Trace was created to make database performance problems in .NET applications visible and actionable. In real-world applications, ORM-generated database queries can become a hidden source of performance issues. Slow queries, N+1 patterns, excessive database calls, and performance regressions are often difficult to identify by looking at application code or database logs alone. ORM Trace was built to bridge this gap. It continuously monitors the interaction between .NET applications, ORMs, and databases, helping developers understand what is happening behind the scenes and identify the problems that have the greatest impact on application performance. The product supports Entity Framework Core and DevExpress XPO, providing a unified view of database activity, request traces, query performance, and ORM-related issues. An AI-powered analysis layer turns technical findings into clear explanations and practical recommendations, helping developers move from “something is slow” to “this is the problem, this is why it happens, and this is what I should fix.”
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75
DevExpress(4)
Rajib Miah's avatar
Rajib Miah
Dhaka, Bangladesh
UI/UX Designer | Fintech, EdTech, SaaS, B2B & B2C Designer
16
Followers
UI/UX Designer | Fintech, EdTech, SaaS, B2B & B2C Designer
Cover image for Koders...Web Builder Sass landing
Koders...Web Builder Sass landing
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1
Cover image for Homiq is a mobile home
Homiq is a mobile home services platform that makes everyday home maintenance easier and more convenient. The experience helps users quickly discover nearby services, explore trusted professionals, understand pricing, and book services without going through complicated steps. The homepage focuses on fast service discovery, while the service detail experience provides important information such as ratings, pricing, availability, warranty, and service options before booking. The Challenge Finding a reliable home service often means too much searching, unclear pricing, and limited information before you book. The goal was to create a simple, trustworthy, and easy-to-navigate experience that helps users move from discovering a service to booking it with confidence. Key Features → Location-based service discovery → Quick service search → Popular & categorized services → Ratings & booking information → Clear service pricing → Instant service availability → Warranty & trust information → Flexible service scheduling → Add multiple services before booking
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Cover image for Telehealth Healthcare Platform — UI/UX
Telehealth Healthcare Platform — UI/UX Design A clean, modern, and user-friendly telehealth website designed to make healthcare simple, accessible, and comfortable. The experience helps users connect easily with trusted healthcare professionals, book virtual appointments, and receive personalized care from home. The platform provides a smooth and reliable digital healthcare experience, helping patients get the care and support they need without the stress of a traditional clinic visit. Key Metrics Upcoming Appointments — View and manage scheduled healthcare visits. Medications — Track medicines, doses, and refill reminders. Messages — Stay connected with doctors and healthcare teams. Health Overview — Get a quick view of your overall health and progress. Health Records — Keep important medical information organized in one place. Vital Tracking — Monitor key health measurements and changes over time.
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Cover image for Telehealth Healthcare Platform — UI/UX
Telehealth Healthcare Platform — UI/UX Design A clean, modern, and user-friendly telehealth website designed to make healthcare simple, accessible, and comfortable. The experience helps users easily connect with trusted healthcare professionals, book virtual appointments, and receive personalized care from the comfort of home. The platform provides a smooth and reliable digital healthcare experience, helping patients get the care and support they need without the stress of a traditional clinic visit. Key Metrics Upcoming Appointments — View and manage scheduled healthcare visits. Medications — Track medicines, doses, and refill reminders. Messages — Stay connected with doctors and healthcare teams. Health Overview — Get a quick view of your overall health and progress. Health Records — Keep important medical information organized in one place. Vital Tracking — Monitor key health measurements and changes over time.
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DevExpress(1)
Thembile Mbele's avatar
Thembile Mbele
Maseru, Lesotho
Experienced IT specialist
New to Contra
Experienced IT specialist
Cover image for I am the lecture in
I am the lecture in my home college Infinity Artisans Institute where I am the lecture in Information Technology and here is the demonstration of how I teach my students online and I can be a private tutor in any information technology related module or course for any level primary students, high school and tertiary students as well.
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Cover image for I have experience creating and
I have experience creating and supporting the design of marketing materials and digital content. My work includes basic graphic design, promotional materials, social media visuals, and video editing. I focus on creating clean, professional designs that communicate information clearly and match the purpose of the project. I have also worked closely with marketing teams to support the preparation of promotional materials for campaigns and school activities. I can assist with creating and editing visual content based on a client’s requirements.
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Cover image for Created and organized Excel spreadsheets
Created and organized Excel spreadsheets for data management and record keeping. My work includes entering and organizing information, formatting worksheets, creating tables, and using basic formulas and calculations to make data easier to manage and understand.
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Cover image for I used Google Classroom to
I used Google Classroom to support online teaching and learning by creating and managing virtual classes, sharing learning materials and assignments, communicating with students, and supporting the delivery of online assessments. This work involved organizing digital learning resources and helping students access and complete their coursework online.
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45
DevExpress(1)
Yvance Pereira's avatar
Yvance Pereira
Paris, France
UX/UI Designer
UX/UI Designer
Cover image for Web App refund
Web App refund
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18
Cover image for Marketing Videos for Alstom
Marketing Videos for Alstom
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23
Cover image for Customer Experience Design
Customer Experience Design
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21
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DevExpress(1)
Obumneme Iloba 's avatar
Obumneme Iloba
Nigeria
Founder @ Wealth Wallet Africa | Fintech Growth & AI Content
1x
Hired
3
Followers
Founder @ Wealth Wallet Africa | Fintech Growth & AI Content
Cover image for Currency conversion
Currency conversion
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16
Cover image for MVP wealth wallet Africa
MVP wealth wallet Africa
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18
Cover image for AI Content & Growth System
AI Content & Growth System for TikTok & YouTube Shorts
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25
Cover image for Building Wealth Wallet Africa: Fintech
Building Wealth Wallet Africa: Fintech Platform & Growth System
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27
DevExpress(1)
Rafael Leite's avatar
Rafael Leite
Belo Horizonte, Brazil
Enterprise & Industrial Software Engineer | Building Success
Enterprise & Industrial Software Engineer | Building Success
Cover image for System Specialist of LD
System Specialist of LD
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4
Cover image for Intelligent System for Blocking Energy Sources
Intelligent System for Blocking Energy Sources
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3
Cover image for Biometric Data Collector
Biometric Data Collector
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1
Cover image for SCADA Remote Monitoring
SCADA Remote Monitoring
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4
DevExpress(1)
Csaba Gyozo Kudor's avatar
Csaba Gyozo Kudor
Oradea, Romania
Experienced Fullstack Engineer | 17+ Years in Web Dev
Experienced Fullstack Engineer | 17+ Years in Web Dev
Cover image for InControl
InControl
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26
Cover image for NDA Generation tool
NDA Generation tool
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8
Cover image for Contests and sweepstakes generator - Angular 2+
Contests and sweepstakes generator - Angular 2+
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5
Cover image for Roller Champions - back office tool
Roller Champions - back office tool
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21
DevExpress(1)