You will get Software Architecture | SaaS Platforms | High-Load Distributed Systems
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Project details
We provide senior-level software architecture consulting for SaaS products and high-load distributed systems, helping teams build scalable, resilient, and cost-efficient platforms or modernize existing ones.
We focus on architecture decisions that improve performance, scalability, and long-term maintainability under real production workloads.
Engagement is flexible (part-time or project-based). We work with your team to define architecture strategy, review systems, and provide actionable technical guidance.
What we do:
SaaS architecture, scalability planning, high-load system design, architecture audits, monolith-to-microservices migration, multi-tenant architecture, performance analysis, cloud migration, reliability and resilience improvements.
Tech & Architecture Focus:
Microservices, DDD, Event-Driven Architecture, CQRS, Kubernetes, Docker, Redis, Kafka, RabbitMQ, API gateways, AWS, Azure, CI/CD, Prometheus, Grafana, ELK, PostgreSQL, MongoDB, sharding, replication.
We are an EU-based software engineering company delivering architecture expertise for SaaS products and enterprise-grade high-load systems.
We focus on architecture decisions that improve performance, scalability, and long-term maintainability under real production workloads.
Engagement is flexible (part-time or project-based). We work with your team to define architecture strategy, review systems, and provide actionable technical guidance.
What we do:
SaaS architecture, scalability planning, high-load system design, architecture audits, monolith-to-microservices migration, multi-tenant architecture, performance analysis, cloud migration, reliability and resilience improvements.
Tech & Architecture Focus:
Microservices, DDD, Event-Driven Architecture, CQRS, Kubernetes, Docker, Redis, Kafka, RabbitMQ, API gateways, AWS, Azure, CI/CD, Prometheus, Grafana, ELK, PostgreSQL, MongoDB, sharding, replication.
We are an EU-based software engineering company delivering architecture expertise for SaaS products and enterprise-grade high-load systems.
Programming Languages
PHP, JavaScript, PythonCoding Expertise
Cross Browser & Device Compatibility, PSD to HTML, SecurityWhat's included
| Service Tiers |
Starter
$70
|
Standard
$299
|
Advanced
$7,000
|
|---|---|---|---|
| Delivery Time | 1 day | 3 days | 60 days |
Number of Revisions | 0 | 1 | 3 |
Number of Pages | 1 | 5 | 30 |
Design Customization | - | - | |
Content Upload | - | - | |
Responsive Design | - | - | |
Source Code | - |
Frequently asked questions
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AY
Amine Y.
May 21, 2026
.NET CORE developer
MK
Margus K.
Sep 15, 2025
Full-Stack C# .NET Core software developer at Foxway
Leonid is an outstanding technical leader who can deliver applications end-to-end. He successfully designed and built complex products from scratch, covering everything from architecture to production launch. This included setting up full environments, CI/CD pipelines, automation, monitoring, and all the surrounding infrastructure. He worked confidently with both Azure and AWS, ensuring scalability, reliability, and smooth deployment in cloud environments.
Beyond the technical side, he managed the team effectively, proactively removed bottlenecks, and kept the delivery process on track. He proved himself as a true leader and a go-to person you can fully rely on.
A professional who can turn any idea into a working solution from concept to production, 5 out of 5.
Beyond the technical side, he managed the team effectively, proactively removed bottlenecks, and kept the delivery process on track. He proved himself as a true leader and a go-to person you can fully rely on.
A professional who can turn any idea into a working solution from concept to production, 5 out of 5.
DK
Dmitri K.
Mar 5, 2025
AWS Cloud Solutions Architect & Developer (Consultant / Team)
AP
Alexandra P.
Oct 17, 2024
Full-Stack C# .NET Core software engineer at Foxway
I had the pleasure of working with Leonid Oleksiuk on a project where he built a new product from scratch.
He set up the product’s infrastructure and built a flexible, scalable software platform.
Additionally, he was responsible for designing and implementing the database architecture, along with developing the necessary data models.
Throughout the project, he took full ownership, conducting thorough research and providing the best solutions. His ability to collaborate across departments ensured smooth project execution. He consistently met all deadlines and delivered high-quality work.
I highly recommend Leonid as a skilled, self-sufficient, and reliable full-stack developer and technical lead.
He set up the product’s infrastructure and built a flexible, scalable software platform.
Additionally, he was responsible for designing and implementing the database architecture, along with developing the necessary data models.
Throughout the project, he took full ownership, conducting thorough research and providing the best solutions. His ability to collaborate across departments ensured smooth project execution. He consistently met all deadlines and delivered high-quality work.
I highly recommend Leonid as a skilled, self-sufficient, and reliable full-stack developer and technical lead.
RD
Rik D.
Apr 13, 2021
Team for .net core/C# and Angular Project
Leonid fitted into our team really well. He completed all the tasks we assigned him in an efficient and nice way. He communicated clearly, so we were always able to align on expectations with the product owner.
About Leonid
Full stack developer C# .NET| Angular/React | Cloud architect | DevOps
100%
Job Success
Warsaw, Poland - 7:17 am local time
💼 Over 8 years of experience (7+ years in production)
⚒ C# .NET and .NET Core
🎨 Angular
☁️ Skilled in architecture design
🌐 Proficient in cloud technologies (AWS, Azure)
🔁 Expertise in CI/CD practices
👋 Greetings:
Hi there! I'm Leonid Oleksiuk, a seasoned Full Stack Developer, Cloud Architect, and Team Lead with over 8 years of experience, 7+ years of which have been in production environments. I have a passion for building robust, scalable, and high-performance web applications. With expertise in .NET , Angular , modern frameworks/libraries, and a strong background in architecture design, I specialize in delivering best practice solutions tailored to your specific needs.
🔧 Skills:
- Backend: C# .NET & .NET Core / ASP.NET ( API , MVC , Web Forms ) , EF & EF Core
- Frontend: Angular , Typescript , NgRx , RxJS , PrimeNG , Angular Material
- Data: MySQL , MSSQL , PostgreSQL , Elasticsearch , MongoDB , Redis
- Testing: xUnit , NUnit , Moq , Pact , Karma , Jasmine , Cypress
- Cloud Platforms: Azure, AWS
- CI/CD: Proficient in implementing Continuous Integration and Continuous Deployment pipelines using GitLab , GitHub , Jenkins , Azure DevOps , and AWS CodePipeline.
- Team Leadership: Experienced in leading development teams, providing guidance, and ensuring successful project delivery.
- Architecture Design: I have a proven track record of designing and implementing scalable and efficient architectures, ensuring the delivery of best practice solutions.
🏆 Why Choose Me:
- I am passionate about building cutting-edge solutions that meet and exceed client expectations.
- My expertise in architecture design allows me to create scalable and efficient solutions tailored to your specific needs.
- With my experience as a team lead, I ensure smooth project execution, timely delivery, and efficient team collaboration.
- I have a keen eye for detail and am committed to delivering high-quality work on time and within budget.
🤝Let's work together to turn your ideas into reality! Feel free to reach out to discuss your project requirements.
🔑 Keywords:
.NET Developer | ASP.NET Developer | C# Developer | .NET Core Expert |.NET MVC Developer | .NET Framework Specialist | .NET Full-Stack Developer | .NET Software Engineer | .NET Core Architect | ASP.NET MVC Developer | ASP.NET Core | ASP.NET Web API | ASP.NET Razor Pages | ASP.NET Blazor | ASP.NET Identity Framework | ASP.NET WebForms | Angular Developer | Angular JS Expert | JavaScript Expert | HTML5 & CSS3 Specialist| React and .NET Integration | Front-End Development with Angular | Responsive Web Design with Angular | TypeScript Developer | MVC Developer | MVVM Architecture | SOLID Principles | Microservices Architecture | RESTful API Design | Software Architecture in .NET | Azure .NET Developer | Microsoft Azure Cloud Solutions| Azure DevOps with .NET | .NET Core Deployment on Azure | CI/CD Pipelines with .NET and Azure | Cloud Solutions Architect | SQL Server Specialist | Entity Framework Expert | LINQ to SQL | Database Design in .NET | NoSQL Databases with .NET | Entity Framework Core | SignalR Developer | DevExpress & Telerik Controls | Dapper ORM | WCF (Windows Communication Foundation) | Object-Oriented Programming (OOP) in .NET | Dependency Injection in .NET | Asynchronous Programming in C# | Multi-threading and Concurrency in .NET | Unit Testing with .NET | MongoDB | COSMODB | Enterprise-Level .NET Architect | Full-Stack .NET Developer | Cloud and API Integration Specialist
Steps for completing your project
After purchasing the project, send requirements so Leonid can start the project.
Delivery time starts when Leonid receives requirements from you.
Leonid works on your project following the steps below.
Revisions may occur after the delivery date.
Initial Architecture Review
We analyze system structure, bottlenecks, scalability, and risks.
Technical Recommendations
We provide clear improvements for performance, security, and scalability.