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Authors
Boian Tzonev

Boian Tzonev

Software Engineer

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.

Blog posts by Boian Tzonev

Synthesia

How We Built a Billing System That Scaled with Us from $40M ARR to ~$140M

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.

Boian Tzonev
February 10, 2026

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