Tanya Fesenko - Lead AI Engineer at Klaviyo

Tanya Fesenko

Lead AI Engineer at Klaviyo

Boston, Massachusetts, United States

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Summary

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Senior

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Top School

Tanya Fesenko is a Lead AI Engineer in Boston with 11 years of experience building data-intensive, cloud-native systems and shipping production ML/AI features. A serial technical founder and engineering leader, she co-founded RepreZen to accelerate API design and later helped scale Crisp’s data platform before joining Klaviyo to lead AI efforts. Her background combines deep backend engineering (Java, Eclipse/EMF tooling) with practical API and schema expertise—she has contributed OpenAPI schema fixes to google/gnostic and editor enhancements to the widely used Ace project. Tanya blends systems-level thinking with product focus, often asking the harder questions about how AI features actually serve customers rather than just adding capabilities. She holds an MS in Mathematics and Computer Science and a professional certificate from Harvard in Innovation and Entrepreneurship, reflecting both rigorous technical training and startup instincts.

11 years of coding experience

23 years of employment as a software developer

Master of Science Mathematics and Computer Science, Master of Science Mathematics and Computer Science at Saint Petersburg State University

Professional Certificate Innovation and Entrepreneurship, Professional Certificate Innovation and Entrepreneurship at Harvard University

English, French, Russian, Czech

Github Skills (17)

kotlin10

assertion10

javascript10

json-schema10

testing10

regex10

java10

javas10

code-generation10

go10

api10

kotlin-multiplatform10

assert10

syntax-highlighting10

openapi10

Programming languages (8)

JavaMakefileJavaScriptGoHTMLJupyter NotebookMarkdownKotlin

Github contributions (5)

google/gnostic

May 2017 - Oct 2017

A compiler for APIs described by the OpenAPI Specification with plugins for code generation and other API support tasks.

Role in this project:

Back-end Developer

Contributions:7 commits, 3 PRs, 9 comments in 5 months

Contributions summary:Tanya primarily focused on enhancing the OpenAPI schema generation process within the `gnostic` repository. Their contributions involved refining the generated JSON schema, particularly around fixing regular expressions for components, media types, and paths. They implemented validation for contact information and ensured adherence to OpenAPI specifications. Additionally, they addressed the handling of additional properties and descriptions to improve schema accuracy and usability.

openapi-codegenprotocol-bufferscode-generationlintersapi

robstoll/atrium

Feb 2020 - Mar 2020

A multiplatform expectation library for Kotlin

Role in this project:

Back-end Developer

Contributions:5 commits, 3 PRs, 7 comments in 24 days

Contributions summary:Tanya primarily contributed to the development of assertion libraries for the Kotlin multiplatform project. They implemented new assertions for `ZonedDateTime` and `ChronoZonedDateTime` for the new infix API. These changes involved copying and adapting existing code, modifying module definitions, and adding unit tests. They also introduced utility functions to simplify code, contributing to the overall usability of the library.

assertion-libraryassertionstestingkotlin-multiplatformkotlin-testing

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