Professional Summary
Backend engineer with 7 years of experience building high-throughput distributed services.
Led the redesign of a payment ledger handling 12M+ daily transactions, cutting p99 latency
from 480ms to 96ms. Comfortable owning a system end to end — from capacity planning and schema design
to on-call, incident review, and cost optimization (reduced infra spend by 31% YoY).
Professional Experience
FinTech Platform Co. — Senior Backend Engineer
Apr 2022 – Present
Payments Core Team · 5 engineers · tech lead for the ledger service
- Redesigned the double-entry ledger with event sourcing and idempotent write paths, scaling from 2M to 12M+ daily transactions while keeping p99 under 100ms.
- Introduced a tiered storage strategy (hot MySQL + cold object store + async reconciliation), trimming storage cost by 47%.
- Built an observability stack (OpenTelemetry + Prometheus + Grafana) and a runbook culture; MTTR dropped from 42min to 11min.
- Mentored 3 junior engineers; two were promoted within 18 months.
E-Commerce Group — Backend Engineer
Jul 2018 – Mar 2022
Order & Promotion Services
- Designed a rule-engine-based promotion system supporting 200+ campaign types; merchant self-service setup time fell from 3 days to 20 minutes.
- Handled 2021 Double-11 peak traffic (peak 58k QPS) with zero P1 incidents through load-shedding and pre-warming strategies.
- Migrated 40+ legacy RPC endpoints to gRPC, reducing average inter-service call latency by 38%.
Selected Projects
Real-Time Reconciliation Engine
2023.05 – 2023.12
Role: technical owner · Stack: Go, Kafka, Flink, PostgreSQL, Redis
- Replaced a nightly batch reconciliation job (4-hour window) with a streaming pipeline; discrepancy detection moved from T+1 to under 30 seconds.
- Automated 92% of manual adjustment tickets, freeing roughly 60 person-hours per month for the finance team.
Education
XYZ University — M.Eng. in Computer Technology
2016 – 2018
Thesis: Consistency Trade-offs in Microservice Data Replication · GPA 3.8/4.0
ABC University — B.Eng. in Software Engineering
2012 – 2016
GPA 3.7/4.0 · First Prize, National Collegiate Programming Contest (Provincial)
Technical Skills
- Languages
- Go (expert) · Java · Python · SQL · TypeScript (working knowledge)
- Infrastructure
- Kubernetes · Docker · Kafka · Flink · Redis · MySQL / PostgreSQL · ClickHouse
- Practices
- System design · distributed transactions · performance tuning · SRE / on-call · cost optimization
- Certifications
- CKAD (Certified Kubernetes Application Developer, 2023) · AWS Solutions Architect Associate
- Languages
- English (professional working proficiency, IELTS 7.5) · Mandarin (native)