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Hi, I'm Szymon Mikolajczak, a Senior .NET Developer with 7 years of experience designing and implementing scalable cloud applications. I specialize in building robust backend services and cloud-native architectures using Azure and event-driven patterns. I enjoy collaborating with cross-functional teams to translate complex business requirements into reliable software, lead technical direction, and optimize systems for performance, reliability, and maintainability.…Hi, I'm Szymon Mikolajczak, a Senior .NET Developer with 7 years of experience designing and implementing scalable cloud applications. I specialize in building robust backend services and cloud-native architectures using Azure and event-driven patterns. I enjoy collaborating with cross-functional teams to translate complex business requirements into reliable software, lead technical direction, and optimize systems for performance, reliability, and maintainability.

Szymon Mikolajczak

Full Stack Developer, Back-End Developer, Web Developer, +2

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Hi, I'm Szymon Mikolajczak, a Senior .NET Developer with 7 years of experience designing and implementing scalable cloud applications. I specialize in building robust backend services and cloud-native architectures using Azure and event-driven patterns. I enjoy collaborating with cross-functional teams to translate complex business requirements into reliable software, lead technical direction, and optimize systems for performance, reliability, and maintainability.…Hi, I'm Szymon Mikolajczak, a Senior .NET Developer with 7 years of experience designing and implementing scalable cloud applications. I specialize in building robust backend services and cloud-native architectures using Azure and event-driven patterns. I enjoy collaborating with cross-functional teams to translate complex business requirements into reliable software, lead technical direction, and optimize systems for performance, reliability, and maintainability.

Available to hire

Hi, I’m Szymon Mikolajczak, a Senior .NET Developer with 7 years of experience designing and implementing scalable cloud applications. I specialize in building robust backend services and cloud-native architectures using Azure and event-driven patterns.

I enjoy collaborating with cross-functional teams to translate complex business requirements into reliable software, lead technical direction, and optimize systems for performance, reliability, and maintainability.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Polish

Fluent

English

Advanced

Italian

Intermediate

Work Experience

Technical Leader at Accenture

August 1, 2025 - October 21, 2025

Led a development team of 4 developers and 2 testers, setting technical direction, establishing best practices, and coordinating efforts with the PM and PO. Architected and drove the implementation of a data synchronization solution using an event-driven architecture (Service Bus, Event Grid) to bridge legacy and microservices systems. Acted as the primary technical point of contact for the client, translating business requirements and UX designs into actionable development tasks. Optimized system performance for high reliability and performance. Coordinated a cross-team initiative to standardize the event handling approach, improving consistency and maintainability across multiple development teams.

Backend .NET Developer at PwC

May 1, 2023 - October 21, 2025

Developed and optimized a high-performance insurance calculation system designed to process millions of records. Engineered new features for a monolithic application using the CQRS pattern, working closely with business analysts in a Scrum environment.

Fullstack .NET Developer at Mountain Warehouse

October 1, 2022 - October 21, 2025

Developed and maintained e-commerce microservices and frontend features for a site with over 100,000 daily users. Led code refactoring initiatives and delivered key projects (e.g., PIM system, checkout enhancements) to improve system performance and developer efficiency.

Fullstack .NET Developer at Citibank

December 1, 2020 - October 21, 2025

Designed and implemented a critical monitoring and incident coordination system, engineering the solution to consolidate disparate events into a single web application UI. Collaborated directly with on-site business stakeholders to ensure the solution precisely met operational needs.

Junior .NET Developer at KMD

October 1, 2019 - October 21, 2025

Contributed to a complex payroll system's architectural transition from a legacy multi-threaded solution to a modern, scalable agent-based model using Akka.NET.