Developer for climate tech and LCA softwareAvailable now
Climate tech products built on data you can defend.
For the past two years I have been the ongoing developer for Målbar, a Danish life cycle assessment company. I have helped build their LCA screening tool, which lets companies estimate the climate footprint of their products, and the internal tooling their team uses every day. Climate data is messy and the methodology matters, and I have learned to build for both.
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Is this a fit?
An honest fit check before we talk
I would rather tell you no on the first call than waste your budget. Here is what a good match looks like in this sector.
A good fit if
- You are building an LCA, carbon accounting, ESG reporting or sustainability product and need a developer who already knows the domain.
- Your product turns large, imperfect datasets into something customers can act on, and the UI has to make that trustworthy.
- You need internal tooling for a small expert team as much as a customer-facing product.
- You want a developer who will stay and grow the product rather than hand over and leave.
Probably not a fit if
- You need an LCA practitioner or a sustainability consultant. I build the software your experts use.
- You need heavy data science or machine learning pipelines.
- You want the cheapest possible build for a pitch deck demo.
What I do
What I typically build in this sector
- Calculation and screening tools
- Interfaces for modelling products, materials and processes, with results that update instantly and explain themselves. Built in Next.js with TypeScript and a Node.js backend.
- Data-heavy UIs
- Tables, comparisons, charts and exports for datasets with thousands of rows, kept fast and readable for non-technical users.
- Internal tooling
- Admin panels, data import and review workflows, and the back-office tools that let a small team support many customers.
- APIs and integrations
- REST APIs for partners and customers, imports from ERP and product data systems, and exports to reporting formats.
Proof
Clients who kept me around
Two years and ongoing in LCA, plus calculation-heavy and data-heavy work in construction and accounting.
Målbar
Full-Stack Developer · Freelance
Ongoing development for a Danish life cycle assessment company. I have helped build their LCA screening tool, which lets companies estimate the climate footprint of their products, along with the internal tooling the team runs on every day.
Read the case studyBunch Bygningsfysik
Full-Stack Developer · Freelance
Built a moisture content calculator for construction compositions. Their existing calculation module already had years of building physics expertise baked in, so I kept it as the engine and put a modern, easy to use web UI on top of it instead of rewriting what worked.
Read the case studyVisma Dinero
Frontend Developer · Full-time, then freelance
Frontend development on Dinero, one of Denmark's most popular accounting platforms for entrepreneurs and small businesses. First as an employee for four years, then they brought me back as a freelancer for two more.
Read the case study
Process
How we'll work together
The same four steps for a two-day fix and a two-year engagement.
Intro call
A free 30-minute call where you tell me about your project, goals and constraints. I ask a lot of questions and tell you honestly whether I'm the right fit.
Proposal & estimate
You get a short written proposal: scope, approach, timeline and price. Fixed price for well-defined projects, hourly or retainer for ongoing work.
Build in the open
Short iterations, working software early, and a weekly update you can actually read. You see progress and can change course before it gets expensive.
Launch & support
I handle deployment, hand over clean documentation, and stick around for support and further development if you want me to.
FAQ
Questions I get asked
- What have you built in climate tech?
- Målbar's LCA screening tool, which lets companies estimate the climate footprint of their products from a description of materials and processes, and the internal tools the Målbar team runs on. The engagement has been ongoing for two years.
- Do you understand LCA methodology?
- Enough to build software for it and to have a sensible conversation with your LCA experts about functional units, system boundaries and impact categories. I am not an LCA practitioner, and I do not pretend to be.
- How quickly do you learn our domain?
- Faster than most, because I ask a lot of questions before writing code. I have picked up LCA methodology, building physics, bookkeeping rules and pharma processes on previous engagements. Expect me to be useful in the first week and fluent in the domain within a month or two.
- What happens after launch?
- I stick around. My clients have kept me for one to six years, first for the build and then for support and further development, usually on a retainer of reserved weekly hours.
- How do you price work?
- Fixed price for well-defined projects, hourly or a monthly retainer for ongoing work. My preferred engagement is 20-40 hours a week for six months or more. Rates are in the proposal, not on the site.
- How quickly can you start?
- Current availability is on the homepage. If it says available, usually within one to two weeks after a free 30-minute intro call and a short written proposal.
Contact
Tell me what you are building
What it is, roughly when it needs to exist, and what a great result looks like. I usually reply within a day, and the first 30-minute call is free.
hello@perhp.com