01
A product carbon footprint calculator
Licensed emission factors, then built a tool: enter a product's attributes and it calculates and visualizes the carbon footprint.
LCAemission-factor licensingattributes → visualization(upcoming)
Earth Driven Developer
I built products for the planet.
I believe technology should ultimately serve a sustainable Earth. Climate change is real: the concentration of CO₂ in the atmosphere keeps rising. So I built products that measure the carbon individuals and companies emit.
As Co-founder / CTO of TomorrowUse and the only engineer on a three-person team, I built carbon-measurement & offset products end-to-end: app, infra, and CI/CD.
Co-founder / CTO · TomorrowUse · 2021-2023 · product: Stepping
Atmospheric CO₂, accumulating
~50
Cafe24 merchants subscribed
1 dev
sole engineer on a team of 3 · app → infra → CI/CD · NestJS / Next.js full-stack
B2C + B2B
Shipped product lines
What I built
Case studies · TomorrowUse, 2021-2023Co-founder / CTO and the only engineer on a three-person team. Each of these I designed, built, deployed, and shipped end-to-end.
02
Carbon-neutral commerce: a Cafe24 subscription SaaS
An EcoCart-inspired SaaS for Cafe24: customers subscribe, the widget auto-injects into product-detail & order-complete pages, and every item sold automatically purchases a 9.8 kg CO₂e offset. Payment SDK integration, infrastructure, and CI/CD automation.
~50 merchants9.8 kg / item~100 t CO₂e / mopayment SDKself-built CI/CD(upcoming)
03
Event-emissions offsetting (B2B)
Measured the carbon emitted by companies' offline promotional events and sold offset credits matching the emissions, so customers could achieve a carbon-neutral event quickly and easily.
B2Bmeasurement → offset(upcoming)
04
Building climate tech as the CTO of a three-person startup, and what I'd change
A retrospective: the agile process of building and promoting new products, the sustainability of the team alongside the sustainability of the planet, and a critique of carbon offsetting itself.
judgmentVerra / VCS researched(upcoming)
How I built it
As the only engineer on a three-person team, development speed mattered. I leaned on existing solutions and kept my focus on the business logic: emission factors licensed, payments through an SDK, and the widget deployed through the Cafe24 API without touching a single line of merchant code. The heart of the product I deployed myself: the application on PostgreSQL and AWS, with a CI/CD pipeline built on GitHub Actions. Prompt-engineering workflows from the early GPT-3 days (2021-2023) helped one person move fast.
LCA + licensed factorsNext.js / Nest.jsCafe24 APIpayment SDKPostgreSQL / AWS (owned)self-built CI/CD · GitHub Actionssole engineer · early-LLM prompt workflows
Carbon, from scratch
Learning series · upcomingThe work above, explained from first principles: the knowledge you need to understand carbon neutrality.
1
What is carbon, and why it matters
CO₂e and the scale of the problem, made tangible
2
Where carbon hides in daily life
Food, travel, energy, goods: emissions where you live
3
How carbon is measured: LCA & emission factors
Cradle-to-grave, a working introduction
Available
Open to senior / staff engineering roles, globally.