Fabian Hedin

Fabian Hedin is co-founder and chief technology officer of Lovable, a platform that lets people build applications by describing what they want. Before helping build software for people who cannot code, he founded a property-management software company and led frontend engineering at Depict. At Lovable, his account of early development emphasizes two lessons learned through mistakes: build for what models can do today, and release early enough to learn from users.

From property management to software creation

Fabian’s early programming experience included running Minecraft servers. He later studied industrial economics at KTH Royal Institute of Technology, where he started TenFAST, a property-management software company, and participated in KTH Innovation’s startup program. He subsequently led the frontend team at Depict, where Anton Osika was co-founder and CTO. Fabian and Anton started Lovable in 2023.

Fabian’s writing for TenFAST explains the operational details his earlier company addressed. His 2021 payment-reconciliation guide describes assigning each rent invoice a payment reference, then using a bank payment file to match incoming money and mark the corresponding rent as paid. Strict reference checking rejects invalid references; a softer setting allows payments with missing or incorrect references. The choice exposes a practical tradeoff: enforcing clean payment data can prevent a tenant’s payment from going through.

His maintenance-request guide describes a workflow spanning tenants and landlords. Tenants could report problems through a portal, while landlords could enter requests received by phone or email. Either party could attach photographs; landlords could schedule work, notify the tenant, and close the request. The software coordinated reporting and follow-through alongside keeping records. TenFAST’s team page identifies Fabian as a co-founder and owner serving in an advisory capacity.

Lovable widened the scope from supplying a particular business application to helping users create their own. Its origins lie in GPT Engineer, the open-source coding tool Anton released in 2023. Fabian and Anton decided to form a company after the project attracted attention, and Lovable launched publicly in November 2024. Anton originated the open-source project; the commercial platform developed through the founders’ partnership and their team’s work.

What early development changed

In his First Block interview, Fabian describes decisions he would now approach differently:

• Build around today’s models. The team initially pursued complex agent systems in anticipation of future AI capabilities. Fabian’s subsequent advice is to choose work the available models can already handle, rather than make a product depend on improvements that have yet to arrive.
• Release sooner. Lovable had a conversational interface paired with an application preview, but remained behind a waitlist too long. Fabian considers that a mistake because it postponed feedback from people trying to build things with the product.
• Use the product inside the company. The team builds internal operational software, including office CRM tools, with Lovable. Using it for their own work gives employees direct experience of its capabilities and limitations.

These lessons concern different parts of development: what to attempt, when to expose it to users, and how to keep encountering its shortcomings after release.

Beyond generating an interface

The platform Fabian co-leads also addresses the infrastructure an application needs once it must store data and serve users. Lovable Cloud, introduced in September 2025, added managed authentication, databases, and file uploads, alongside AI functionality that does not require users to configure model API keys manually.

The team’s agent infrastructure separates an agent’s recorded history, incoming messages, and execution. Other agents can send work while a task is running; the receiving agent incorporates those messages at defined points in execution. This supports conversations that delegate application changes to an app-building agent and return progress to the user. It is a contribution of Lovable’s engineering team, rather than an invention attributed individually to Fabian.

Who gets to build

Fabian and Anton received the 2025 KTH Innovation Award for their work expanding access to software creation. Fabian frames that access as an economic issue: if only a small share of people can participate in AI’s value creation, its benefits risk becoming concentrated. He and Anton have also signed the Founders Pledge, committing to donate half their future profits to meaningful causes if Lovable succeeds.