Case study — Creative SaaS · Generative AI
How Grootcore helps build and maintain the platform behind Neolemon — an AI cartoon platform where a character defined once holds its identity across unlimited scenes, poses and art styles.
Neolemon — define a character once, place it in unlimited scenes
Tech stack
The context
Ask one for “a curly-haired girl in a red coat.” Ask again for the same girl, now on a bicycle. You get a different girl — different face, different proportions, subtly different everything.
For someone generating a single image, that's a curiosity. For someone illustrating a 32-page picture book, it makes the tool worthless. The character on page four has to be the character on page twenty-seven.
Neolemon's founders set out to close exactly that gap. The product thesis was narrow and sharp: let a non-technical creator define a character once, then place that character into unlimited scenes, poses, outfits and expressions — the same character, every time.
Neolemon's team owns that product and its architecture. Grootcore was brought in to help build and maintain specific parts of the platform around it, and the constraints below are the ones that shaped our side of the work.
The target user is a children's author, not a prompt engineer. Neolemon's own FAQ makes the promise explicitly: no design experience, no AI experience, no complex prompting. Every frontend decision had to survive that constraint.
A credit-metered plan is only trustworthy if users are never charged for work they didn't receive. Getting that right meant handling the unhappy paths — failed generations, failed payments, mid-cycle changes — as carefully as the happy one.
Every user accumulates a growing image library. Dashboard and gallery loads had to stay quick regardless of library size or user geography.
Our role
Grootcore works to Neolemon's direction on a defined scope: the customer-facing frontend, the subscription and billing integration, deployment and cloud infrastructure, and ongoing performance work. Product direction, the character-consistency approach and the generation pipeline design are Neolemon's.
The application interface a creator actually uses — character creation, the style picker, project and scene management, the creator dashboard, credit and generation history views. The brief throughout: the underlying AI should be invisible. No prompt fields, no model settings, no vocabulary a children's author would have to learn.
Grootcore supported the implementation of the client-facing side of Neolemon's generation flow: wiring the interface to the platform's generation services, handling asynchronous job states, and making queueing, third-party rate limits and variable latency legible to the user without exposing any of the machinery. The pipeline design and the identity approach are Neolemon's; our work was making them dependable in the product surface.
Character references — one character, unlimited scenes
Style system — the same identity across distinct art styles
Grootcore implemented the Stripe integration behind Neolemon's credit model — signup allowance, paid-plan renewals, upgrades and cancellations, failed payments, and mid-cycle top-up purchases — with billing state kept consistent against Stripe as the source of truth. The requirement driving it: a user should never be charged for a generation they didn't receive.
Grootcore set up and maintains the deployment and hosting configuration for the frontend and application services, along with CDN-backed delivery of generated assets so gallery and dashboard loads stay fast as each user's library grows. Ongoing work covers monitoring, releases and performance tuning.
Creator dashboard — projects, credits, and generation history
Results
The engagement is ongoing. The figure below is Neolemon's, stated publicly on their homepage.
Client-stated, Neolemon homepage
What the engagement demonstrates:
Work with us
Not every team needs a new architecture. Some need engineers who can take a defined scope — frontend, billing, infrastructure — and keep it shipping and stable alongside an existing team. Book a 30-minute technical review with Grootcore Systems.