Feng Xu

S

Senior Backend Engineer at Lenovo | ex-Mercari

Lenovo
Melbourne, Australia · AEST (UTC+10)
6+ years experience
Vietnam National University
English, Arabic
CollaboratingAdvising
Messaging unavailable

Overview

Senior Backend Engineer at Lenovo, focused on payments infrastructure. Led the migration of 19 services to gRPC. Shipped a rewrite that took build times from 24 minutes to under 4. Most at home with Kafka and Java.

Good reasons to reach out
  • Advice on payments infrastructure
  • Collaborators for my side project
  • Questions about payments infrastructure
  • Working sessions on idempotency
Please don't message about
  • Courses and coaching offers
  • Agency or outsourcing pitches
  • SEO and link-building offers

Replies within two days

Skills
JavaPostgreSQLgRPCKafkaPCI DSSidempotencyGo
CollaboratingLooking to collaborate
closes in 3 months

Building a free course on PostgreSQL for students - need co-instructors

Project
A free course on PostgreSQL for students - need co-instructors
Skills needed
Backend, Go
Time commitment
A few hours a week
Outcome
Small product with real users

A few hours a week. Some groundwork already done.

Melbourne, Australiapostgresqlpci dssgrpc
Open
AdvisingOpen to advising
closes in 3 months

Happy to advise students choosing a first job on payments infrastructure

Topics
payments infrastructure, gRPC, PCI DSS
Format
Office hours
Terms
Free for early founders
Capacity
Two calls a month
Best for
Teams scaling past 50 people

6 years of payments infrastructure. Prefer specific questions over coffee chats.

Melbourne, Australiapostgresqljavagrpc
Open

Experience

  1. Senior Backend Engineer
    Nov 2025 - Present
    Lenovo · 11 mo · Full-time · Melbourne, Australia
    • Mentored 4 engineers through their first promotion.
    • Brought on-call pages for payments platform down from 24 a week to 2.
  2. Backend Engineer
    Jun 2022 - Nov 2025
    Mercari · 3 yr 5 mo · Full-time · Melbourne, Australia
    • Shipped 29 launches on the payments platform team without a rollback.
    • Brought on-call pages for payments platform down from 34 a week to 1.
  3. Backend Engineer
    Dec 2020 - Jun 2022
    EY · 1 yr 6 mo · Full-time · Melbourne, Australia
    • Took payment success rates from 91.4% to 98.3%.
    • Cut p99 latency on the payments platform services from 647ms to 147ms.

References

No references yet.

Education

  1. Vietnam National University
    BSc, Information Technology
    2016 - 2020

Details

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