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Artem Melnikov

@artem-melnikov

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Principal backend engineer specializing in AI systems, serverless AWS, and LLM productionization.

Serbia

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What I'm looking for

I seek hands-on roles building production LLM-powered, serverless systems on AWS where I can lead architecture, improve observability, and drive measurable business impact.

I am a principal backend engineer with deep expertise building AI-powered, serverless systems on AWS, designing and operating production LLM pipelines that scale to hundreds of thousands of assessments per month. I have led end-to-end delivery across architecture, backend implementation, and production operation for large hiring and EdTech platforms, introducing agentic LLM workflows, centralized prompt management, and significant cost and performance improvements.

My work has driven measurable business impact — from a ~30% reduction in Salesforce costs and major storage optimizations to creating Interview Bot and Grading Bot that process ~100k assessments monthly and accelerate grading by up to 30%. I combine hands-on engineering (TypeScript/Node.js, Kotlin), vector search and retrieval, and multi-provider LLM orchestration with strong infrastructure skills in AWS serverless services to deliver reliable, observable, and secure production systems.

Experience

Work history, roles, and key accomplishments

Principal Backend Engineer

Crossover

Jan 2023 - Jan 2026 (3 years)

Architected and operated serverless AI-powered hiring products processing 100,000+ candidate interactions monthly; led full-stack delivery across 8+ major projects, reducing costs and improving assessment automation and sourcing effectiveness.

TypeScript AWS Lambda DynamoDB OpenSearch API Gateway Step Functions

Backend Principal Engineer

Crossover

Jan 2021 - Jan 2023 (2 years)

Designed company-wide IaC for serverless applications with AWS CDK, migrated projects from Amplify and reduced CI/CD time 4x; automated developer workflows and contributed data import and Salesforce cost-saving solutions.

AWS CDK TypeScript Serverless CI CD DynamoDB Elasticsearch CloudFormation

Chief Software Architect

Crossover

Jun 2020 - Nov 2020 (5 months)

Led rewrites and new serverless SaaS architectures (ResponseTek, e‑commerce search), introduced IaC and observability, and managed small engineering teams to deliver secure, observable cloud-native solutions.

TypeScript Angular AWS Lambda AppSync Cognito CDK CI CD Architecture

Software Architect

Crossover

Apr 2019 - Feb 2020 (10 months)

Developed a serverless FogBugz rewrite, designed multi-tenant DynamoDB access patterns, implemented ElasticSearch indexing and CI/CD pipelines, and achieved high test coverage and significant codebase reduction.

TypeScript DynamoDB Elasticsearch GraphQL Jest AWS Lambda CI CD CloudFormation

Software Engineer (Maintenance)

Crossover

Apr 2016 - Mar 2019 (2 years 11 months)

Maintained and modernized five Java-based products, improving test coverage and resolving production issues via remote debugging and static analysis tools.

Java Junit Mockito SonarQube PMD Debugging Maintenance

Java Developer

Sberbank-Technology

Aug 2015 - Nov 2015 (3 months)

Developed an internal employee portal using Java EE and WebSphere, contributing to backend features and integrations during an internship/contract engagement.

Java EE Websphere Hibernate SQL Backend Development