Looking for a job

Stanislav Lavrynenko

@stanislavlavrynenko

Message

I build reliable, high-performance .NET backend systems for search, billing, and data-intensive SaaS products.

Ukraine

Message

What I'm looking for

I'm looking to own and improve business-critical .NET backend systems, particularly data-intensive search, order-processing, billing, and distributed-platform work where reliability and performance matter.

At ListKit, I own revenue-critical .NET backend systems for order processing, contact search, and billing across a B2B lead-generation platform with 665M+ contact profiles. I tune high-volume search and data workflows across MS SQL Server, SingleStore, and ClickHouse while resolving indexing, consistency, concurrency, and webhook issues.

Previously, at Symphony Talent, I re-architected contact search from MS SQL Server to Elasticsearch and built C# and Python ingestion services. I've also designed billion-item processing pipelines at mBLAST and led distributed development teams, bringing hands-on experience with complex legacy systems, testing, root-cause analysis, and reliability hardening.

Experience

Work history, roles, and key accomplishments

Current

Senior .NET Backend Engineer

Current

ListKit

Jan 2024 - Present (2 years 8 months)

Owns core backend systems for a B2B lead-generation SaaS platform, including order processing, contact-search infrastructure, and billing. Leads verification and test-infrastructure efforts to reduce production incidents.

.NET9 C#MS SQL Server EF Core SingleStore Clickhouse Elasticsearch REST Web APIs Microservices Docker RabbitMQ Kafka Hangfire Datadog Characterization Testing Integration Testing Root Cause Analysis

Senior .NET Developer / Search Engineer

Symphony Talent

Jan 2017 - Dec 2023 (6 years 11 months)

Re-architected contact search from a database-only model to Elasticsearch, improving search performance across the product. Built data-ingestion services and maintained up to ~50 applications including microservices and Azure Functions.

C#Python .NET Core ASP.NET Core Elasticsearch MS SQL Server Azure Functions Web APIs Microservices Legacy ASP ASP.NET Web Forms

System Architect

mBLAST

Jan 2012 - Dec 2017 (5 years 11 months)

System architect for a SaaS marketing/influencer platform, designing and improving processing pipelines handling billions of data items. Led several development teams in Ukraine, coordinating delivery across distributed groups.

Big Data Distributed Systems System Architecture Team Leadership Pipeline Design

Senior .NET Developer / Team Lead

Various

Jan 2002 - Dec 2012 (10 years 11 months)

Held senior development and team-lead positions across logistics, fintech, banking, and enterprise web platforms, including order-management applications and custom payment integrations.