Available for new opportunities

Bc. PatrikDuch

Transforming complex business challenges into elegant, scalable solutions.
10+ years designing enterprise systems that drive innovation and growth.

View Projects Get in Touch

10+

Years Experience

20+

Projects Delivered

25+

Happy Clients

Certifications

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Who I Am

About Me

Building technology solutions that make a real impact

My Approach

I build solutions that are technically robust and aligned with real business goals and user needs. My experience spans startups to large organizations, including a role as an Integration Architect for Government, where I designed enterprise-grade systems using Apache Kafka, Schema Registry, Spring Boot, and Kubernetes on Azure Arc (AKS) with Helm Charts.

I enjoy exploring new technologies, continuous learning, and mentoring teams. When I’m not designing distributed systems, I contribute to open-source projects or lead technical workshops, such as React training sessions. Recently, I’ve also started exploring Vue and Nuxt — in fact, this website is built with Nuxt.

Performance Focus

Optimizing systems for maximum efficiency

Security First

Building secure and compliant solutions

Key Expertise

Cloud Architecture0%

System Design0%

Security Architecture0%

Performance Optimization0%

Technologies I Work With

KubernetesDockerAWSAzureGCPPostgreSQLPGVectorKafka.NETJavaNode.jsPythonGo LangRustFastAPIEmbeddingsVector StoresLangChainLangGraphLangFuseTypeScriptJavaScriptReactNext.jsNuxtVue.js

Career Journey

Work Experience

A decade of building scalable enterprise solutions

2024–2025Multiple contracts

CTO / Solution Architecture

Greenfield Products & Payments

Key Highlights

• Complete end-to-end PoC covering backend, frontend and DevOps, supplemented with UML models and complete supplier documentation
• Architecture and operations: operational cost modeling, CDN strategy design, secure secrets and SMTP management, robust CI/CD processes
• Modern marketing website in Next.js with payment integration and powerful .NET backend
• Application containerization, reverse proxy security and comprehensive integration testing
• Disaster Recovery strategy for distributed systems and centralized Audit Log implementation

Next.js.NETPaymentsCI/CDDocker

2022–2023Full-time

Solution Architect

Mobility SaaS & Enterprise Communication

Key Highlights

• Clean Architecture, CQRS, identity and SSO flows (OAuth2/SAML)
• Event-driven/serverless data pipelines and security reviews
• Testing strategies, migrations, DB refactoring, observability
• Team mentoring and end-to-end CI/CD enablement

ServerlessKafkaOAuth2/SSO.NET/JavaPostgres

2021–2022Contract

Freelance Solution Architect

Retail Operations Modernization

Key Highlights

• SOA for work management in distributed environments
• OAuth2 implementation and SQL performance optimization
• Microservices integration and technical mentoring

JavaSpring BootKafkaPostgresReact

2021Contract

Freelance Solution Architect

Realtime Delivery & Open Banking

Key Highlights

• Low latency courier tracking: realtime messaging and integration
• Open Banking interfaces (PSD2) with automated tests

gRPCSignalRRabbitMQOpen BankingTesting

04/2019 - 02/2020Employment

E-commerce Developer

NetDirect

Key Highlights

• Maintained and extended the Fastcentrik.cz e-commerce platform powering 800+ online stores, ensuring stability and smooth operation across a large multi-tenant environment.
• Integrated XML data feeds with systems such as IS Pohoda, ensuring reliable synchronization and reducing manual data handling.
• Designed and implemented a scheduler service for automated XML distribution, improving operational efficiency and reducing repetitive tasks.
• Created unit and integration tests to increase platform reliability and prevent regressions across key modules.

ASP.NETASP.NET MVC 4.5MS SQLAngularJSEntity FrameworkRabbitMQT-SQLXMLWindows Server

07/2018 - 02/2019Employment

E-commerce Developer

Programia s.r.o

Key Highlights

• Optimized performance and scalability of multi-brand B2C e-commerce platforms (Astratex, Spokojený pes, Fitness4U), improving load times and stability under peak traffic.
• Improved development speed, maintainability, and testability by ~20–25% by introducing a hybrid Razor/WebForms rendering layer in a legacy ASP.NET ecosystem.
• Designed and implemented a WCF integration service for Heureka.cz reporting, enabling automated data synchronization and reducing manual overhead.
• Developed new modules and platform integrations across the company’s e-commerce ecosystem, ensuring consistent functionality and maintainability.
• Improved reliability of legacy WebForms components and contributed automated tests to increase long-term stability.
• Maintained and updated a legacy Classic ASP scraping script, working with early-generation ASP web programming patterns.

ASP.NETMS SQLWebFormsWCF.NET Core 2.1Automated Testing

12/2017 - 07/2018Employment

Application SW Engineer

Ness Czech s.r.o

Key Highlights

• Implemented key React-Redux modules for an internal GDPR compliance system in collaboration with a distributed engineering team, improving developer experience and frontend maintainability by ~15%.
• Worked on core banking system components for Erste Group, delivering new features and maintaining mission-critical modules built on Java EE.
• Delivered early React-Redux and ES6/ES7 training for teams across Prague and Ostrava during the company's transition to modern frontend development.

Java EESpring BootMariaDBReactRedux

10/2016 - 05/2017Employment

ASP.NET & MS SQL Developer

ComProMiS s.r.o

Key Highlights

• Designed and developed a greenfield WPF invoice application, including full system architecture, UI design, role-based authentication, and Crystal Reports PDF generation.
• Contributed to an ASP.NET MVC project-planning application by implementing new features, fixing bugs, and improving overall stability and maintainability.
• Introduced WPF as a modern replacement for WinForms, increasing UI responsiveness by approximately 35%.
• Designed and implemented a custom encryption-like algorithm inspired by Rijndael (AES) principles for securing internal application data.

ASP.NET MVC 4.5MS SQLWPFWinFormsEntity FrameworkCrystal Reports

Portfolio

Featured Projects

Solutions delivering business value and innovation

🔐

FeaturedSecurity

Enterprise Identity & Access Management Platform

Designed and led an enterprise IAM platform with unified SSO across multi-tenant SaaS products. Integrated OAuth2/OIDC and SAML authentication flows, implemented AWS Cognito as a federated IDP, and added TOTP-based MFA for enhanced security. Delivered secure partner connectivity through AWS VPC Peering, routed private assets via S3 VPC endpoints, and built an event-driven audit/compliance pipeline using Apache Kafka, SNS, and SQS for reliable asynchronous processing.

.NETIdentityServerOAuth2/OIDCSAML +10

⚙️

FeaturedCloud & Distributed Systems

Scalable Event-Driven SaaS Platform

Architected a cloud-native SaaS platform for the US market using .NET, Node.js, and TypeScript with AWS serverless and event-driven microservices. Improved reliability, reduced latency, and enabled horizontal scaling for millions of monthly transactions.

.NETNode.jsTypeScriptAWS +3

🤖

FeaturedArtificial Intelligence

AI/LLM Consulting for US & Czechia Clients

Provided end-to-end AI consulting for US and Czechia companies, designing production-grade LLM workflows, retrieval-augmented generation (RAG) systems, and vector-search architectures. Delivered LangChain/LangGraph pipelines, custom embeddings, PGVector integration, FastAPI services, and real-time inference optimizations tailored to client use-cases.

PythonFastAPILangChainLangGraph +5

🔄

FeaturedData Engineering

Event-Driven Messaging Infrastructure

Designed and delivered a high-throughput Kafka-based integration platform enabling reliable event delivery across distributed microservices. Implemented stream processing, schema governance, and multi-service data pipelines powering real-time communication across enterprise systems.

Apache KafkaSchema RegistryJavaSpring Boot +2

🚚

FeaturedLogistics

Real-time Courier Tracking System

Developed a low-latency real-time courier tracking platform processing thousands of location updates per minute. Implemented bidirectional communication with SignalR and gRPC, optimized routing logic, and delivered a reliable tracking experience used in production by a major e-commerce provider for several years.

SignalRgRPCRabbitMQReact +2

🏆

FeaturedAcademic

Bachelor's Project – Isomorphic SPA Template

Web information system with dynamic rendering, isomorphic architecture and content management system.

ReactReduxNode.jsExpress +4

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Verified Expertise

Professional Certifications

Industry-recognized credentials validating expertise in enterprise architecture

Total Certifications

2024-25

Recent Achievements

100%

Current & Valid

Issuing Organizations

Verified

ArchiMate® 3 Foundation

The Open Group

Standard for enterprise architecture modeling for describing, analyzing and visualizing architecture within business domains.

Verified

ArchiMate® 3 Foundation

TaylorCox

Advanced enterprise architecture certification focused on practical use of the ArchiMate modeling language.

Verified

SystemsExpert

AlgoExpert

Comprehensive system design certification covering scalability, reliability and performance optimization.

Verified

FrontendExpert

AlgoExpert

Advanced frontend development certification covering modern frameworks, performance and best practices.

Verified

InfraExpert

AlgoExpert

Infrastructure and DevOps certification covering cloud platforms, containerization and deployment strategies.

Verified

Oracle Academy - Programming with PL/SQL

Oracle Corporation

Covers advanced PL/SQL development, including stored procedures, functions, triggers, exception handling, cursor management, packages, and implementing complex business logic inside Oracle databases.

Verified

Oracle Academy - Database Design and Programming with SQL

Oracle Corporation

Comprehensive 180-hour training covering conceptual and physical database design, ER modeling, normalization (1NF–3NF), relational mapping, advanced SQL querying (joins, subqueries, grouping, set operations), DDL/DML/TCL, constraints, views, sequences, and building a full end-to-end Oracle SQL database project (1Z0-071 preparation).