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Ruslan Semkiv

@ruslansemkiv

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Backend engineer at Spotlight.ai who built sales workflows and cut deal matching from 3 minutes to 40 seconds.

Ukraine

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At Spotlight.ai, I built the deal-stage and sales-workflow backend and REST APIs, along with an AI integration layer that scored sales stages against transcript content. I cut deal-to-transcript matching time from 3 minutes to 40 seconds.

I also optimized closed-deal aggregation for organizations with about 1,500 deals, reducing dashboard load time from 6 minutes to 1.5 minutes. On legacy services I owned, I raised JUnit test coverage from 15% to 85%.

At OX Company, I replaced synchronous service calls with a Kafka event pipeline and designed tenant-context propagation and method-level authorization. I also delivered backend APIs for patient analysis transfers used daily by 15 clinics.

Earlier, at ETIYA, I redesigned the billing data model and improved reporting query performance. At Integrity Vision, I automated a bank loan-extension workflow, reducing processing time per application from 42 to 17 minutes.

Experience

Work history, roles, and key accomplishments

Java Software Engineer

Spotlight.ai

Apr 2026 - Sep 2026 (5 months)

Optimized closed-deals aggregation for ~1,500 deals, cutting dashboard load time from 6 to 1.5 minutes via SQL rewrites and partial indexes. Built deal-stage backend and REST APIs in Java 21 and Spring Boot, and raised test coverage from 15% to 85%.

Java 21+Spring Boot Hibernate Flyway PostgreSQL Docker Kubernetes Helm GCP Azure REST Junit LLM Integrations

Backend Software Engineer

OX Company

Nov 2023 - Jan 2026 (2 years 2 months)

Replaced synchronous service calls with a Kafka event-driven pipeline, cutting log event processing time by 18%. Designed tenant-context propagation and method-level authorization with Spring Security, and owned delivery of 13 microservices on AWS EKS.

Java 21+Spring Boot Spring Security Kafka PostgreSQL Clickhouse Redis Docker Amazon EKS Helm GitLab CI CD AOP

Backend Software Engineer

ETIYA

Aug 2022 - Oct 2023 (1 year 2 months)

Designed and normalized the relational model for a billing system, reducing storage by 13% and eliminating data-inconsistency defects. Rewrote high-traffic reporting queries, reducing execution time by 22%, and raised test coverage from 30% to 85%.

Java Spring Boot Spring MVC Hibernate Oracle SQL PostgreSQL RabbitMQ Maven Junit Git

Backend Software Engineer

Integrity Vision

Apr 2021 - Aug 2022 (1 year 4 months)

Designed and delivered end-to-end automation of a loan-extension workflow, cutting processing time from 42 to 17 minutes and removing ~60% of manual steps. Implemented loan business logic and built SOAP and REST integrations with external and internal systems.