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# Boian Tzonev

Boian Tzonev is a software engineer at Synthesia, working on billing, payments, and growth systems. Previously, he built large-scale billing and ledger platforms at Uber, with a focus on distributed systems and domain-driven design.

## Latest blog posts by Boian Tzonev

Tool and strategies modern teams need to help their companies grow.

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Synthesia\
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**How We Built a Billing System That Scaled with Us from $40M ARR to ~$140M**\
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How Synthesia built a flexible, scalable billing system to grow from $40M to $140M ARR—covering isolation, usage metering, MongoDB design patterns, and a complex migration.](/content/post/how-we-scaled-our-billing-system-from-40m-to-140m-arr/index.html)