About

Hi, I am Jessie.

Projects

Resume

Name: Jessie Chatham Spencer Github: https://github.com/jmintb Blog: https://www.jessiecspencer.com/ Email: jessie@jessiecspencer.com

Summary:

Software engineer with experience in data science, compilers, mobile applications, frontend, backend, MLOps, and cloud infrastructure + orchestration(Kubernetes).

My free time is spent on open-source contributions or my own projects related to compilers, language design, data science, and MLOps.

Most of the code I write these days is in Rust.

Formal Education

• Bachelors in CS at Aarhus University
• Masters in CS at Aarhus University (I am currently in the last semester)

Academic Highlights

• Bachelor thesis: LLVM based JIT Compiler written in Rust
• Master thesis: Drift Detection in Machine Learning Systems for Production
• Rust based internal tool for DIS lab to be used for provisioning, scheduling, and operating experiments
• Implemented a compiler for the compilers course on the bachelor's. Using ocaml and a subset of LLVM, including an x86 backend.

Opensource Work

I have/am making contributions to a few open-source projects. Most notably:

• Rust
• kube-rs

Notable Projects

Compiler using Rust, MLIR and LLVM

I have recently started working on my own language and compiler using Rust, MLIR, and LLVM. Check it out here: https://github.com/jmintb/typed_script

I write about the process here

End-to-end MLOps tool in Rust

I spent the last year developing a Kubernetes-based MLOps tool first in Go and then in Rust.

It consists of multiple controllers, a gRPC service, CLI, and a dashboard all in Rust.

Repo: https://github.com/TeaInSpace/ame

Docs: https://teainspace.github.io/ame/user_guide/0_introduction/

Experience

MLOps Startup Attempt

Company: TeaInSpace

Period: 2022-07 to 2023-09

Summary: I focused on bootstrapping an MLOps-based company. Through this process I:

• Implemented multiple K8S controllers, Custom resources, CLIs, and gRPC services in Rust and Go.
• Performed rapid early prototyping of a Kubernetes-based approach validating the technical early in the process.
• Wrote extensive documentation.
• Decided to sunset the project due to strong incumbents and drift from the original release plan.

Head of IT

Company: RE-ZIP
Period: 2021-07 to 2022-06 Summary: I was hired to transition the company to a sustainable and modern tech stack while maintaining legacy systems.

• Developed services in Go, migrated mobile application to Flutter, along with building an administration dashboard in React.
• Proposed and implemented GPS-based pick-up points circumventing the need for setting up fixed barcodes at each location.
• Documented and performed a thorough handover of all new and legacy systems.
• Interviewed and managed interns.

Student Developer on the Machine Learning Team

Company: Salling Group

Period: 2020-07 to 2021-07

Summary: Designed, built, and maintained a bespoke portable and scalable MLOps platform using K8S and Argo Workflows which is still in use today. Experimented with various recommendation models for clothing based on visual similarity.

• Built bespoke cloud based MLOps infrastructure replacing on-premises legacy system.
• Implemented a cost-effective cluster scaler based on the individual job compute requirements.
• Developed a secure remote access solution for accessing the on-premise infrastructure during covid. It is still in use today.
• Ensured that the infrastructure was reproducible and easy to update.
• Instilled software engineering best practices into the team.
• Documented the system during handover so the team could maintain it themselves after I left even without K8S experts.
• Gathered data and experimented with techniques for recommending clothing based on visual simularity.
• Onboarded and guided colleagues through expanding and working with the MLOps platform.

Student Developer on the API Team

Company: Salling Group

Period: 2019-08 to 2020-07

Summary: I worked on internal tooling, developed Node.js-based services, and maintained our infrastructure.

• Designed and implemented APIs exposing internal company data to user-facing applications in a secure, performant, and maintainable manner.
• Migrated legacy services to new Azure-based offerings.
• Improved internal tooling such as administration dashboards, security alerting, and various forms of automation.
• Worked on various aspects of the in-house API gateway.
• Continously worked on improving internal processes and tools via experiments and weekly introspection with the team.

Student Developer (2017-12 to 2018-08) / Full Time Developer (2018-08 to 2019-08) on the Mobile Team

Company: Sallng Group

Period: 2017-12 to 2019-08, first year as a student developer, second year as a full-time developer while I was on break from my bachelor's degree.

Summary: Developed and maintained various Android applications, services in Nodejs and Go. Pushed the team towards implementing automation, code review, tests, and fostering a more collaborative culture.

• Implemented services to expose REST APIs for customer-facing applications. Employing automated testing and deployment for rapid iteration.
• Developed core libraries for user management to avoid repeating the work in each application.
• Solved various longstanding technical issues in the applications.
• Maintained a variety of customer-facing Android applications.
• Maintained various front-end applications for internal use.
• Performed user research to determine what the customers wanted and needed.
• Supervised student developers.

App Startup Attempt

Company: CJ Software

Period: 2016-09 to 2017-08

Summary: I developed an Android application to read notifications to the user. It got a small amount of traction with a few paying users.