Senior C#/.NET Backend Developer | 5+ years of experience
📍 Austria (GMT+1)

📧 adampolyanskiy@gmail.com
💼 LinkedIn
🐙 GitHub

Senior C#/.NET developer with 5+ years in ERP, BI, IoT telemetry, and HR Tech. Strong in microservices, distributed systems, and event-driven architectures. Specialized in scalable backend services, real-time data processing, system observability, and full SDLC delivery including CI/CD, testing, and AWS deployments.

Backend:
C#, .NET 6+, ASP.NET Core, EF Core, Dapper, MediatR, AutoMapper, FluentValidation, REST APIs, gRPC, WebSockets/SignalR, OAuth2/OpenID, xUnit/NUnit/MSTest, Testcontainers, Serilog, PostgreSQL, SQL Server, Redis, NoSQL, ClickHouse, Hangfire, Quartz.NET

Cloud & DevOps:
Docker, Kubernetes, AWS, Terraform, GitLab CI/CD, Jenkins, Prometheus, Grafana, Datadog, ELK stack, RabbitMQ, Kafka, NGINX, IIS

Other:
Swagger/OpenAPI, Postman, Agile/Scrum

Oct 2024 – Nov 2025 · 1 yr 2 mos | Hybrid

• Delivered a new API replicating legacy interfaces on modern infrastructure, improving system stability and reducing maintenance effort.
• Consolidated requirements and documentation from 5+ teams, establishing a single source of truth and reducing onboarding time for new developers by 25–30%.
• Integrated the new API into the enterprise data pipeline, enabling decommissioning of legacy components and lowering infrastructure and support costs by an estimated 5–10%.

Sep 2021 – Oct 2024 · 3 yrs 2 mos | Remote (Austin, TX)

• Enhanced microservices with replication and architectural optimization, improving system resilience and reducing resource usage by 31.8%.
• Built a telemetry simulation tool supporting load and chaos testing, identifying bottlenecks pre-production and reducing post-release issues by 13.2%.
• Integrated Grafana dashboards for real-time monitoring, enabling cross-service performance tracking and early issue detection based on company-wide metrics.

Aug 2020 – Sep 2021 · 1 yr 2 mos | Hybrid

• Developed a BI web app using .NET and React for real-time business analytics.
• Built a real-time service availability system using SignalR/WebSockets, reducing support tickets by 51.5%.
• Increased code coverage by 25–30% through NUnit automation.
• Implemented Redis caching improving latency by ~30% and reducing PostgreSQL load by ~20%.
• Migrated a legacy monolith to Docker microservices, reducing deployment time by 27.9%.

Bachelor's degree, Computer Science
Tomsk State University of Control Systems and Radioelectronics
Sep 2017 – Jun 2021