All Cases
How Yuno Increased Product Adoption by 50%+ with a Documentation Portal Built from Scratch
From a seed-stage fintech with no documentation to a multi-award-winning payment API; how WriteChoice built and scaled Yuno's entire developer documentation infrastructure over four years.
CHALLENGE
Zero Documentation
SOLUTION
Developer Portal + Ongoing Maintenance
RESULT
50%+ Product Adoption Increase
The Problem: Building a Documentation Foundation for a Complex API Product
In 2022, three months after closing their seed round, Yuno's co-founder and CEO reached out to WriteChoice with a clear but challenging mandate: build a developer documentation portal for a payment orchestration platform that was still taking shape.
The challenges were significant.
No existing documentation: Yuno had no portal, no structure, and no baseline for the team to build from.
A complex, evolving product: The payment orchestration platform had multiple features that were actively being added and changed, making documentation a moving target.
No internal bandwidth: The product team was entirely focused on building the product. They had neither the capacity nor the technical writing expertise to document it.
Undefined developer journey: There was no clarity yet on what the critical flows were, what the main use cases looked like, or how a new developer should experience the product for the first time.
Without proper documentation, Yuno risked slow developer onboarding, low API adoption, and a fragmented first impression, all critical liabilities for a fintech scaling fast after a funding round.
How WriteChoice Solved It
WriteChoice became Yuno's embedded documentation team, handling everything from initial strategy through daily execution for over four years.
Phase 1: Discovery, Tool Selection & Information Architecture
We started by getting close to the product. Through a series of intensive discovery calls with Yuno's engineering and product teams, we mapped the developer journey end-to-end, identifying the key entry points, the critical API flows, and the most common use cases that new developers needed to understand.
From there, we defined the documentation tool, started with ReadMe, designed the information architecture, and established the structural logic that would guide everything built afterward.
Phase 2: Portal Build & Iterative Release
Rather than waiting for everything to be ready, we released the portal in stages, iterating as Yuno's product expanded. This meant:
API reference documentation with real request/response examples tailored to each use case
SDK documentation built alongside the API docs
Guided getting-started flows designed to get a developer to their first successful API call in under 20 minutes
Multi-language support across the entire documentation portal
Phase 3: Embedded Partnership & Documentation Automation
Over four years of daily collaboration, WriteChoice operated as an integral part of Yuno's product team. Working through a dedicated Slack channel, we processed documentation requests, managed updates as features were added, and built automated pipelines to keep the API reference in sync with the product, eliminating the manual overhead that typically bottlenecks documentation at scale.
Phase 4: Platform Migration to Mintlify
As Yuno's product matured, ReadMe's limitations became apparent. A platform built for simpler API documentation was no longer adequate for the depth and complexity of Yuno's growing feature set.
We recommended and led the migration to Mintlify, completing the full transition in 48 hours. The new platform unlocked richer documentation experiences, better developer UX, and improved scalability for future growth.
The Impact
RESULT
Best Payment API Award
RESULT
15 Minutes to the first successful API call
RESULT
50%+ Product Adoption Increase
50%+ increase in product adoption, driven by a structured documentation experience that made Yuno's API accessible from day one.
15–20 minutes to the first successful API call. New developers can create a payment and understand the basics of the service within 20 minutes of landing on the docs.
Integration time reduced from months to approximately two weeks, with well-structured flows and use-case-driven guides that eliminate guesswork.
Full platform migration completed in 48 hours, with zero disruption to existing developers.
Best Payment API Award; an industry recognition that reflects both the quality of Yuno's product and the clarity and professionalism of their documentation.
4+ year embedded partnership, with WriteChoice continuing to maintain, expand, and evolve the portal as Yuno's product scales.
"WriteChoice has been part of our team since day one. Their ability to take a complex, evolving product and make it immediately accessible to developers has been a direct driver of our adoption growth."
— Pablo Ortega, CEO & Co-Founder, Yuno
Ready to Turn Your Documentation into a Growth Engine?
WriteChoice builds and maintains developer documentation portals that accelerate product adoption, reduce support costs, and free your team to focus on what they do best.
CLIENT
Yuno
INDUSTRY
Fintech / Payment Orchestration
PARTNERSHIP
4+ Years (2022–Present)