Yahor Marashchuk
@yahormarashchuk
Backend Developer (.NET) at Themisoft GmbH, building multi-tenant SaaS and cutting catalog search latency to ~150 ms.
GermanyWhat I'm looking for
At Themisoft GmbH, I developed the backend of an ABP-based multi-tenant SaaS platform used by 300+ fitness studios across Germany, Austria, and Poland. I shipped modules for memberships, payments, bookings, and studio administration, including SEPA direct debit and German-compliant POS receipts.
I improved EF Core and PostgreSQL performance, reducing response time by 40% and increasing throughput by 35% in fixed before-and-after load tests. I also cut background-processing compute costs by about 62% and built an OCR document-scanning pipeline that reduced manual back-office work by about 75%.
Previously, as a Junior Backend Developer (.NET / C#) at EPAM Systems, I contributed to catalog, pricing, and inventory services for a B2B e-commerce platform. I moved heavy catalog filtering to Elasticsearch and added Redis caching, reducing average search latency from 1.5–2 seconds to about 150 ms.
Experience
Work history, roles, and key accomplishments
Backend development for a multi-tenant B2B SaaS platform (ABP Framework, ASP.NET Core, PostgreSQL) used by 300+ fitness studios and 2,000–5,000 active users across Germany, Austria and Poland.
▪ Designed and shipped end-to-end backend modules: contracts, memberships, SEPA direct debit, payments, POS/accounting, bookings, campaigns and studio administration.
▪ Implemented multi-tenancy: subdomain-
Backend development for a large B2B e-commerce platform of a European distributor of industrial equipment and electronics: multi-level corporate ordering, account-based purchasing, dynamic discounts, catalog search, pricing, inventory and order-processing workflows.
▪ Developed backend functionality for microservice-based .NET systems: C#, ASP.NET Core, EF Core, PostgreSQL, MediatR/CQRS, RabbitMQ
Education
Degrees, certifications, and relevant coursework
College of Business and Law
Diploma of Secondary Specialized Education, Software Engineering
2017 - 2021
Tech stack
Software and tools used professionally
Availability
Location
GermanyAuthorized to work in
Salary expectations
Social media
Job categories
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