10/02/2026 updated
100 % available
Solution Architect | Multi-Tenant SaaS | Azure & .NET
Kraków (Krakow), Poland
Only remote
M.Sc. Computer ScienceClean ArchitectureAzure FunctionsAzure DevOpsRabbitMQ.NET Core
Solution Architecture & Cloud (Azure)
End-to-end solution design on Azure PaaS, including Azure Service Bus, Azure Functions, Azure SQL and CosmosDB. Architecture of multi-tenant SaaS platforms applying Domain-Driven Design, Clean Architecture, CQRS and Event-Driven Architecture with bounded contexts and integration blueprints.
.NET & Full Stack Development
Hands-on development with .NET 8+, .NET Core, ASP.NET, C#, EF Core and SQL Server on the backend, combined with React 19, Next.js, Angular and TypeScript on the frontend. Delivery of production-grade applications from architecture to deployment.
API & Integration Design
Design and implementation of RESTful APIs, event contracts, webhooks, real-time push via SignalR, SOAP, XML and XSD. Experience building facade API integration layers unifying large numbers of third-party services behind a single stable contract at high request volumes.
LLM & AI Orchestration
Multi-provider LLM orchestration layer covering Claude, Gemini and OpenAI with model-tier routing, per-tenant budget enforcement, graceful degradation and automated document and code analysis.
Microservices & Messaging
Migration of legacy monoliths into microservices and design of event-driven messaging architectures using RabbitMQ, MassTransit, Azure Service Bus and Event Sourcing for reliability and data consistency across distributed services.
GDPR & Security Compliance
Implementation of GDPR and CCPA compliance for regulated personal data, including subject-access export tooling, retention rules, tenant data isolation, encrypted credential storage, audit logging and DSAR tooling.
Architecture Governance & Documentation
Production of Architecture Decision Records, C4-style system and integration diagrams, technical documentation and architecture reviews to keep architecture honest across onshore-offshore teams.
DevOps & Tooling
Use of Azure DevOps, Jira, Bitbucket, Git, CI/CD Pipelines, Docker and Test Automation to support continuous delivery and team collaboration.
Technical Leadership & Stakeholder Management
Leading engineering teams, running discovery and requirement workshops, presenting to non-technical and executive audiences, conducting technical pre-sales and estimation, and coaching engineers on DDD and Clean Architecture.
End-to-end solution design on Azure PaaS, including Azure Service Bus, Azure Functions, Azure SQL and CosmosDB. Architecture of multi-tenant SaaS platforms applying Domain-Driven Design, Clean Architecture, CQRS and Event-Driven Architecture with bounded contexts and integration blueprints.
.NET & Full Stack Development
Hands-on development with .NET 8+, .NET Core, ASP.NET, C#, EF Core and SQL Server on the backend, combined with React 19, Next.js, Angular and TypeScript on the frontend. Delivery of production-grade applications from architecture to deployment.
API & Integration Design
Design and implementation of RESTful APIs, event contracts, webhooks, real-time push via SignalR, SOAP, XML and XSD. Experience building facade API integration layers unifying large numbers of third-party services behind a single stable contract at high request volumes.
LLM & AI Orchestration
Multi-provider LLM orchestration layer covering Claude, Gemini and OpenAI with model-tier routing, per-tenant budget enforcement, graceful degradation and automated document and code analysis.
Microservices & Messaging
Migration of legacy monoliths into microservices and design of event-driven messaging architectures using RabbitMQ, MassTransit, Azure Service Bus and Event Sourcing for reliability and data consistency across distributed services.
GDPR & Security Compliance
Implementation of GDPR and CCPA compliance for regulated personal data, including subject-access export tooling, retention rules, tenant data isolation, encrypted credential storage, audit logging and DSAR tooling.
Architecture Governance & Documentation
Production of Architecture Decision Records, C4-style system and integration diagrams, technical documentation and architecture reviews to keep architecture honest across onshore-offshore teams.
DevOps & Tooling
Use of Azure DevOps, Jira, Bitbucket, Git, CI/CD Pipelines, Docker and Test Automation to support continuous delivery and team collaboration.
Technical Leadership & Stakeholder Management
Leading engineering teams, running discovery and requirement workshops, presenting to non-technical and executive audiences, conducting technical pre-sales and estimation, and coaching engineers on DDD and Clean Architecture.
Experience
Professional experience10+ years
Freelancer since2020
Languages
EnglishFluentPolishNative speaker
Project history
Founded and built a multi-tenant B2B SaaS for AI-powered candidate screening as sole architect and engineer. Architected the platform on .NET 8, EF Core, Hangfire and SignalR with a React 19/Next.js front end applying DDD and Clean Architecture. Designed a multi-provider LLM orchestration layer with model-tier routing and per-tenant budget enforcement. Built REST APIs, idempotent webhook processing, ATS connectors and real-time event push. Delivered GDPR and CCPA compliance. Ran customer discovery, technical pre-sales, pricing and tier packaging, onboarding 4 design-partner customers.
Leading architecture and delivery of a business-critical Project Pricing platform on Azure PaaS, .NET 8+ and Angular, heading a 6-person engineering team. Pulling requirements apart with business owners, producing technical documentation, integration diagrams, specifications and Architecture Decision Records. Designing REST API layers, coordinating offshore delivery, running architecture reviews and coaching engineers on DDD and Clean Architecture.
Solution architect on a multi-tenant SaaS platform, owning system and integration design across the team's domains. Designed a scalable facade API integration layer (.NET 6, Angular) unifying 10+ third-party services behind a single stable contract at roughly 500,000 requests per day. Architected event-driven workflow automation on Azure Service Bus and Azure Functions.