Joanne Hua Wang

S

Senior Backend Engineer at Telstra · Java, gRPC

Telstra
Melbourne, Australia · AEST (UTC+10)
7+ years experience
INSEAD Singapore
English
Messaging unavailable

Overview

I've spent 7 years on payments infrastructure - first at Deloitte, now at Telstra. Wrote the distributed systems service that now handles 26 million requests a day. Most at home with PostgreSQL and PCI DSS.

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  • Working sessions on PCI DSS
  • Speaking or podcast invitations
  • Thoughtful intros to people in my field
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  • Courses and coaching offers
  • Unpaid work or spec projects
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Replies on weekday evenings

Skills
gRPCPostgreSQLdistributed systemsJavaidempotencyPCI DSS

Experience

  1. Senior Backend Engineer
    Jun 2024 - Present
    Telstra · 2 yr 4 mo · Full-time · Melbourne, Australia
    • Brought on-call pages for payments platform down from 33 a week to 1.
    • Took payment success rates from 94.5% to 98.9%.
  2. Backend Engineer
    Aug 2022 - Jun 2024
    TSMC · 1 yr 10 mo · Full-time · Melbourne, Australia
    • Reduced cloud spend on payments platform by 34% in two quarters.
    • Moved 63% of payments platform traffic off a legacy monolith without a customer-facing incident.
  3. Backend Engineer
    Oct 2019 - Aug 2022
    Deloitte · 2 yr 10 mo · Full-time · Melbourne, Australia
    • Designed the reconciliation system that matches 3 million transactions a day.
    • Took payment success rates from 93.5% to 98.9%.

References

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Education

  1. INSEAD Singapore
    MBA, Business Administration
    2018 - 2020
  2. Australian National University
    BSc, Mathematics
    2014 - 2018

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