Mark Dovgalyuk

Hi, I’m Mark.

I build and operate production systems end to end. Currently, I’m the data strategy lead at TalentCraft, where I design the AWS infrastructure behind our ATS/CRM integrations, the pipelines that feed them, and the products built on top.

I work across backend services, cloud infrastructure, and product. The work I care about lives where those meet.

I graduated from Northwestern in 2025 and am based in Chicago. My background is in opera and data science.

Writing

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· 5 min read

Bullhorn's REST API Part 2: JPQL, Lucene, and pagination design

Bullhorn splits bulk reads across a relational JPQL engine and a Lucene index. The two order results differently, and that difference decides which pagination strategy works on each.

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· 5 min read

Bullhorn's REST API Part 1: 3-legged OAuth and rotating refresh tokens

Bullhorn's API uses 3-legged OAuth, built for human-in-the-loop apps. Backend integrations have to design around that mismatch, plus the single-use refresh tokens Bullhorn issues and the failure modes that come with them.