Open to opportunities

Сергей Пономаренко

@0002989

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Senior .NET backend developer building distributed, event-driven microservices and AI-integrated production platforms.

Spain

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What I'm looking for

I’m looking for a remote-friendly team where I can own backend services end-to-end—microservices, messaging, and CI/CD—while staying hands-on in distributed systems and AI-powered features.

I’m a Senior .NET Backend Developer with 9+ years building production systems—from multi-tenant SaaS platforms to real-time microservices with AI integration. I thrive on technically complex work like distributed systems, event-driven architectures, and technically deep backend ownership.

I’ve led a cross-functional team of 8 people while staying hands-on in code, owning and delivering core backend modules such as Chat, Credits, Notifications, and User Management. My work spans ASP.NET Core (Web API, gRPC), CQRS/Vertical Slice and DDD, real-time features with SignalR, scalable messaging (RabbitMQ/MassTransit/Kafka), and cloud delivery on AWS/Azure with Docker, CI/CD (Azure DevOps/GitHub Actions), and observability (Serilog, OpenTelemetry). I also integrate AI capabilities using AWS Bedrock and OpenAI APIs, including embeddings and vector search for smarter user experiences.

Experience

Work history, roles, and key accomplishments

Current

Senior .NET Backend Developer

Current

SIEMA

Jan 2024 - Present (2 years 5 months)

Owned and developed core backend modules for a feature-oriented .NET 9 labour marketplace platform, including chat, credits, notifications, and user management. Implemented CQRS/vertical slice with Wolverine, real-time communication via SignalR and domain events, integrated third-party services, and delivered AI-powered vector search using AWS Bedrock and OpenAI APIs with observability and CI/CD s

ASP.NET Core CQRS Wolverine SignalR EF Core OpenAI API Vector Search OpenTelemetry

Senior .NET Backend Developer

Treepl

Sep 2022 - May 2024 (1 year 8 months)

Worked on a SaaS CMS and SSO platform hosted on AWS, helping migrate legacy .NET Framework applications to .NET 6 microservices to improve resilience and deployment flexibility. Designed REST APIs and backend services using CQRS/Mediator, implemented asynchronous messaging with RabbitMQ and MassTransit, and maintained Azure DevOps CI/CD and deployment workflows.

Microservices ASP.NET Core CQRS REST APIs RabbitMQ Mass Transit AWS Azure DevOps

Team Lead .NET Backend Developer

Lizard Soft

Aug 2020 - Sep 2022 (2 years 1 month)

Promoted to Team Lead after 7 months and managed a cross-functional team of 8 people. Migrated a monolithic system to cloud-based microservices on Azure and implemented backend components using ASP.NET Core, Azure Service Bus, Azure Functions, and Azure SQL.

Team Leadership ASP.NET Core Azure Service Bus Azure Functions Azure SQL Microservices Monolith Migration System Integration

.NET Backend Developer

Agile Fuel

Sep 2019 - Aug 2020 (11 months)

Developed backend APIs using ASP.NET Core and Clean Architecture principles in an Agile/Scrum environment delivering features in short iterations. Reduced operational costs through systematic refactoring of bottlenecks.

ASP.NET Core Clean Architecture Backend REST Refactoring Agile Scrum .NET

Full-Stack .NET Developer

Applikator

Jul 2014 - Sep 2019 (5 years 2 months)

Contributed to a multi-tenant SaaS cloud retail system by owning a dedicated microservice and supporting other services across the platform. Built and maintained REST APIs and database-driven backend services using .NET Framework 4.7, collaborating with frontend developers on system integration and participating in design and long-term maintenance.

REST APIs Microservices Backend API Integration System Design Collaboration