twelveco2 > twelveco2 Employee Directory > Charlotte Willens
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Charlotte Willens
Engineering Manager
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Location: San Francisco, California, United StatesApprox. Years of Experience: 12
Charlotte Willens's Current Workplace
Twelve
Company Size
301-1000
Amount Raised
$199.4M
We're Twelve, the carbon transformation company, a new kind of chemical company built for the climate era. Our breakthrough technology eliminates emissions by turning CO2 into essential products that today are made from fossil fuels. We call it carbon transformation. We're reinventing what it means to be a chemical company, on a mission to create a climate positive world and a fossil free future.
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Notable Investors
Elemental Excelerator, Techstars, Carbon Direct, National Science Foundation, StartX (Stanford-StartX Fund)
Chemical
CleanTech
GreenTech
Sustainability
Experience
Twelve
Jan 2023 - Present
Engineering Manager
Mar 2025 - Present
2 mos
Tech Lead Manager
Oct 2023 - Mar 2025
1 yr 6 mos
Tech Lead Manager, Staff level. Two direct reports
Senior Software Engineer
Jan 2023 - Oct 2023
10 mos
Carbon transformation
Blend
Feb 2017 - May 2022
Senior Software Engineer
Jun 2020 - May 2022
2 yrs
I was a team lead on our Application Platform team (backend). - Tech lead on project to add functionality to Blend’s no-code platform used for creating workflow-based consumer finance product applications. This project added support for multiple applicant users per financial application. • Led speccing sessions for platform architectural changes related to the project, and secured buy-in from other teams working on the platform. • Collaborated with product manager and designer to spec out user-facing changes to the no-code application builder UI. • Planned sprint work for myself and 4 other engineers. - Centralized Blend’s core platform email update and user management logic, adding in functionality for bulk updates. Became subject matter expert and wrote detailed documentation to help newer engineers understand the many layers of Blend’s user management. - Contributed to two projects pulling parts of Blend’s original monolith service out into microservices. Set up dual database writes and reads during the transition over to the new service, and set up / monitored metrics to ensure that the functionality was unchanged. - Led platform engineering onboarding sessions; onboarded and mentored new team members; identified common bugs that came up during on-call and distributed among the team for triage; conducted 100+ technical interviews; founding member of the Blend cheese club.
Software Engineer
Feb 2017 - Jun 2020
3 yrs 5 mos
I was on the full-stack UI team that owns our consumer facing apps. - Decoupled UI deployment infrastructure to separate UI release from core backend deploy; built out release pipeline for our UI apps. More details here: https://full-stack.blend.com/building-a-versioned-ui-deploy-system-for-fast-stable-deploys-and-rollbacks.html - Worked on 2 year project to migrate our main consumer-facing UI app from Angular to React + Redux. I implemented our core routing algorithm, our top level pages / views (and their child views several levels down), and many individual components. - Built consumer facing home page that tracks state of the loan, user's progress through their application, etc - Implemented code-splitting and lazy loading for our consumer app to decrease bundle sizes, which resulted in decreased page load times - Lead frontend engineer on project to move our consumer app over to a new set of endpoints which allow the frontend to access only the data it strictly needs to function. Involved a big behind the scenes overhaul of our app functionality, and vastly improved performance. - Built some complex React components, including a payment capture form, a scrollable multi-document pdf viewer using react-pdf and react-window, components that integrate with third party services (an IDV app and a document signing service) - Onboarded and mentored new team members + interns; conducted 100+ technical interviews stack: React + Redux on the frontend, Node.js with typescript + mongodb for our core backend service, Node.js with typescript + postgresql for our microservices (plus golang for a couple), python for deploy scripts
Data Analyst II - Statistical Programmer
Acumen, LLC
May 2014 - Aug 2015
1 yr 4 mos
Worked on a variety of projects with the goal of making Medicare Part D as effective and efficient as possible. Used SAS to analyze large datasets, and Excel to present the results. Presented findings to clients during weekly conference calls. Taught SAS training to new programmers.
Analyst
Charles River Associates
Aug 2013 - Apr 2014
9 mos
Worked with case teams to assist economists in preparing expert reports for court cases involving antitrust issues. Cleaned, interpreted, and analyzed large datasets using Stata, Excel, and occasionally SAS. Interviewed and evaluated candidates for the Analyst position.
Grader and Tutor - Department of Mathematics
Pomona College
Sep 2012 - May 2013
9 mos
Graded homework assignments and tracked student progress for Math 171, Abstract Algebra 1. Tutored for Math 101, Introduction to Analysis.
Undergraduate Researcher - Applied and Computational Mathematics REU
UCLA Mathematics
Jun 2012 - Aug 2012
3 mos
Conducted research on Chaparral Shrubs in the Santa Monica Mountains with frequent wildfires with a small group of undergraduate mathematics students and Dr. Tim Lucas from Pepperdine University. Used MATLAB to model growth curves for different species taking rainfall into account, simulate a fire schedule based on the Weibull distribution, and finally simulate our study site at Pepperdine University under different fire return intervals and rain schedules.
Education
  • 2009 - 2013
    Pomona CollegeBachelor’s Degree, Mathematics
  • 2012 - 2012
    Budapest Semesters in Mathematics
  • Dates unavailable
    Hack ReactorAdvanced Software Engineering Immersive Program