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About Founders Factory

Founders Factory builds and funds startups together with exceptional entrepreneurs and the world's leading companies. Created by IPO-exited founders, we offer founders capital, operational support from a team of hands-on experts, and unrivalled access to a coalition of industry-leading corporate partners. Since 2015, Founders Factory's 450+ portfolio companies have secured 500+ pilots and commercial contracts with our partners.

Our Studio partners with entrepreneurs at day one, developing new ideas, technologies and business models into high-growth companies. In partnership with ExpresSo NB, a corporate venture arm of PTT — Thailand's national energy company, we are building a new portfolio of climate ventures out of Bangkok.

About the Venture

Thailand is about to have a residential solar boom. In August 2026 the government announced a ฿50,000 non-repayable grant per household, plus GSB and GH Bank soft loans, targeting 500,000 to 1 million homes on 5 kW rooftop systems. The market was already growing 22% a year before the subsidy.

The problem is everything around the panel. Homeowners are making a ฿150,000–340,000 technical decision blind. Air conditioning, the biggest load in nearly every home, runs after dark, so a system without storage generates while the house is empty. Exported power earns ฿2.20 against ฿4.00 retail, so a well-sized system matters more than a big one. And nobody is accountable for the saving: the installer quotes a number and leaves. On the supply side, roughly 2,500 mostly sub-scale installers have no way to absorb the volume. They design by hand, wait weeks for bank disbursement, and buy hardware at retail.

We are building FaiSabai: the operating system for residential solar in Thailand. A homeowner sends their bill on LINE. FaiSabai sizes the system from real consumption, adds a battery where the load needs one, and bundles grant, soft loan and an accredited installer into one contract. The household owns the asset from day one. A home monitoring device then verifies the promised saving and shifts controllable load into the generation window. Installers get qualified leads, design and quoting software, hardware at network prices, and payment on completion.

Nobody in Thailand sells an owned system with a managed outcome today. The reference models, 1KOMMA5° in Germany, Omnidian in the US and SolarSquare in India, are not live here. The sector has already shown it can scale: ION Energy reached 110 MW and 3,000+ installs a year before Bangkok Cable acquired it in April 2026.

Early validation: a landing-page test generated leads at ฿467 each, and homeowner interviews showed people want to own the system, fear being scammed, and want accreditation they can trust. The data and software layer is what makes FaiSabai defensible, and that is what you will build.

The Role

You join Sirapat, FaiSabai's technical co-founder, to build the company. You own the product, platform, home monitoring and data. Sirapat owns demand and partners. Together you cover the whole business.

This is a full-time, fully committed founding role.

Our Offer

FaiSabai runs on an accelerator model: you build with the security of a national energy group behind you, and the speed and support of a venture studio around you.

Employed by ExpresSo NB: You are employed and paid by ExpresSo NB as co-founder. Package and any equity to be discussed.
Funded from day one: Go-to-market and operating costs come from ExpresSo NB's budget, so you spend your time building, not fundraising for runway.
Expert team: Hands-on support from Founders Factory across product, growth, data, design, legal, hiring and more.
Accelerator: Deep operational support on growth, product and fundraising, plus access to Founders Factory's investor network.
Validation: A vetted concept with homeowner interviews, a lead-generation test, a financial model and operator interviews from Singapore, the Philippines and Germany already done.

CTO - PreSeed Solar Tech Startup

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