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Jonathan To

Backend engineer, 10 years, mostly payments

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About

Ten years of backend work, most of it on payments, and I currently own a ledger that is not allowed to be wrong. I run system design practice the way an interviewer does, and then tell you which answers would not survive a real incident.

Languages
English · Cantonese
Fields
Technology

Services

Software engineering & computational thinking

  • Professional methods: learning objectives, instructional design and formative assessment.

Articles

Article
What breaks at ten times the traffic

The design you sketch in an interview usually works. That is not the question. The question is what it does when the load goes up by a factor of ten and the third service in the…

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    Task

    Course

    Demo · Run a 60-minute coding lesson

    Task feeHK$650–HK$1,000 / person

    Ideal clients

    Learners seeking guided instruction and practical exercises. · Learners who can attend the scheduled lesson.

    Task scope

    Work through one small programming exercise

    • Work through one small programming exercise
    • Deliver working sample code and practice notes
    • One guided lesson; lesson notes included.

    5 Nov 2026 · 10:00–11:00 · HKT · Online

    Places left
    5 / 5
    Demo task · Illustrative scope and priceSign in to request this Task