Looking for a job

Lyubomir Polyanov

@lyubomirpolyanov

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I lead .NET teams designing and building reliable, secure, cloud-native platforms.

Bulgaria

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What I'm looking for

I'm looking to lead hands-on engineering for reliable distributed systems, partnering across Product, Architecture, QA, DevOps, and Delivery to balance technical quality, product needs, and long-term maintainability.

.NET Tech Lead with 16+ years of software engineering experience, combining technical leadership with strong hands-on expertise in designing and building reliable, maintainable, and production-ready distributed systems. Proven track record of leading cross-functional engineering teams, driving technical and architectural decisions, mentoring developers, scaling engineering teams, and taking greenfield products from inception through production. Strong background in C#, .NET, ASP.NET Core, microservices, DDD, CQRS, event-driven systems, Azure, and AWS, with a focus on engineering quality, observability, automated testing, CI/CD, system reliability, security, and operational readiness. Extensive experience in US healthcare environments with HIPAA, security, and data privacy requirements, working across Engineering, Product, Architecture, QA, DevOps, and Delivery to balance technical constraints, product expectations, timelines, and long-term maintainability.

Experience

Work history, roles, and key accomplishments

Software Technical Lead

Concord EU

Oct 2023 - Jun 2026 (2 years 8 months)

• Technical leadership and hands-on .NET engineering across two greenfield enterprise platforms.
• Led two Scrum teams (~10 engineers) delivering a US healthcare platform from inception to production under HIPAA/security/privacy requirements for ~4,000 customers, and helped establish a third team.
• Defined database partitioning and cloud cost/capacity models.

Azure Functions Technical Leadership Azure Cosmos DB Azure MongoDB Redis Azure Service Bus Docker ASP.NET Core Keycloak Angular Microservices C#.NET Core Scrum Azure SQL TypeScript OpenTelemetry gRPC

Senior Software Engineer

Concord EU

Mar 2022 - Oct 2023 (1 year 7 months)

• Senior Full Stack .NET engineering on a distributed US healthcare payment platform.
• Built ASP.NET Core microservices using DDD, CQRS, MediatR, HTTP APIs and RabbitMQ event-driven messaging, with MongoDB, SQL Server and Redis; deployed through UAT on OpenShift via Docker and Octopus Deploy.
• Delivered payment provider integrations and worked with the solution architect and Business Analysts

RabbitMQ MongoDB Redis TypeScript Docker Microservices ASP.NET Core C#.NET Core Kubernetes OpenShift

Senior Software Developer

Object Systems International - Bulgaria

May 2018 - Oct 2021 (3 years 5 months)

• Built AWS-hosted healthcare microservices under HIPAA/security/privacy requirements, sustaining 99.99% availability.
• Worked with business stakeholders on requirements, feasibility, trade-offs and timelines.
• Interviewed candidates and helped form a 4-engineer team; later worked in a merged 6-engineer unit, setting standards, mentoring engineers and coordinating cross-team dependencies.

Redis Elasticsearch C# .NET Core .NET Framework Microservices ASP.NET Redis Pub Sub SQL Server Angular 12+Docker AWS TypeScript TFS Jenkins

Senior Software Developer

bet365

Apr 2017 - Apr 2018 (1 year)

• Developed third-party gaming provider integrations and an internal Selenium-based
solution for automated game availability validation.
• Led development of an internal WinForms configuration tool; performed second-stage
code reviews as an additional quality gate; acted as final code review gate across teams.

.NET Framework ASP.NET Web API 2.0 MS SQL Server C#Jira Selenium WinForms

Software Engineer

EPAM Systems

Mar 2016 - Apr 2017 (1 year 1 month)

• Delivered third-party provider integrations across multiple .NET customer engagements, spanning implementation, testing and system design.
• On an AWS-hosted system health monitoring platform, proposed and justified Elasticsearch as the primary datastore through comparative technical evaluation; coordinated technical dependencies across two engineering teams.