From Campus to SOFA: One Engineer’s Journey Building Alibaba’s Open Middleware

There is no magic formula for success; effort and persistence bring opportunities.

Lu Zhi, born in 1989, graduated from Zhejiang University of Technology and was recruited by Alibaba. At 30, he leads the open‑source effort for Ant Financial’s SOFA middleware.

In 2009 he joined Alibaba’s campus‑enterprise internship, secured a B2B team offer after a year, and spent his early years writing ordinary, sometimes tedious code, focusing on product development and business system integration.

Motivated by a desire to improve, he dived into open‑source research, forming a semi‑informal interest group that studied code together for nearly two years.

After building a prototype tool to boost development efficiency within a month, he decided to move from the B2B team to the SOFA middleware team, driven by a clear goal to work on middleware.

In the SOFA team, Lu faced new challenges: he had to consider the needs of developers who use the middleware, paying attention to naming conventions, spelling, and user experience. He emphasized rigorous attention to detail because programmers spend a lot of time on variable names.

He entered a “hard” mode where previous knowledge seemed insufficient, prompting him to study middleware fundamentals from the ground up, apply them at work, and quickly master the product’s intricacies.

During the 2016 Double 11 shopping festival, the team tackled a critical bug in an old protocol that threatened the elastic architecture, working weekends and enduring intense pressure until they delivered a stable solution.

The name SOFA (Service Oriented Fabric Architecture) was coined by the CTO, reflecting both service‑oriented architecture and a comfortable “sofa” experience for engineers.

In April 2018, SOFA was open‑sourced, now supporting nearly 2,000 applications within Ant Financial, proving its robustness in real‑world financial scenarios.

Lu advises newcomers to start with simple contributions—fixing typos or naming issues—and gradually move to submitting issues and bugs, as maintainers welcome community involvement.

What Is SOFA?

SOFA (Scalable OpenFinancial Architecture) is Ant Financial’s self‑developed, finance‑grade distributed middleware, offering components such as a microservice framework, RPC framework, service registry, distributed scheduler, rate‑limiting/circuit‑breaker, tracing, high‑availability messaging, and distributed transaction frameworks.

Unlike traditional centralized financial IT architectures that rely on costly mainframes, SOFA adopts a distributed design, delivering high concurrency, strong consistency, sub‑second disaster recovery, and elastic scaling—capable of handling massive traffic spikes like Double 11 using commodity servers.