Payments and Billing
Stripe subscriptions, usage-based billing, invoicing, and payment failure handling.
Critical Feature Build
A tightly scoped sprint to ship one specific, high-stakes feature into a product you already have running. It is not a full MVP build and not open-ended iteration: one feature, scoped and priced before work starts, delivered in one to three weeks.
1-3 Weeks
Sprint Length
Fixed Scope
Agreed Before the Sprint Starts
How a Critical Feature Sprint Runs
1
Scoping Before Sprinting
- A feature spec is written and signed off before any code is touched, so scope does not drift mid-sprint
- The technical approach is validated against your existing codebase and architecture, not built in isolation
- Edge cases and failure states get defined upfront: what happens when a payment fails, when the model times out, when a third-party API is down
- A clear definition of done, specific acceptance criteria, not a vague sense that it looks about right
2
High-Stakes Feature Types We Build
- Payment and billing flows, including Stripe subscriptions, usage-based billing, and invoicing
- AI feature integration: adding one LLM-powered capability into an existing product surface
- Third-party integrations such as Salesforce, Slack, calendar sync, or SSO
- Auth and permissions overhauls, including roles or multi-tenant access control
3
Shipping Into an Existing Codebase
- Onboarding to your codebase, conventions, and deployment pipeline before writing any feature code
- Feature flags for a staged rollout instead of a single flip-the-switch deploy
- Tests written against the specific feature and integrated into your existing CI
- Code reviewed against your team's own standards, not delivered as an unreviewed drop
4
Sprint Structure
- Early days: scoping, technical design, and environment access
- Core build phase with daily async updates so nothing surfaces as a surprise at the end
- Final days for testing, edge-case hardening, and a staged rollout
- A handoff call walking your team through the implementation and any follow-up items
Feature Types We Ship in a Sprint
One feature, built and integrated into your existing product
AI Feature Integration
Adding one specific LLM-powered capability into an existing product surface.
Third-Party Integrations
Connecting to Salesforce, Slack, calendar systems, or other external APIs.
Auth and Permissions
Adding roles, SSO, or multi-tenant access control to an existing auth system.
Real-Time Features
Live collaboration, in-app notifications, or chat built on a realtime backend.
Data Migrations
Schema changes and data backfills for a feature that touches existing production data.
Platform Extensions
Bringing an existing web feature to mobile, or adding a new client surface.
Scoped PR Delivery
The feature shipped as reviewable, incremental pull requests into your existing repo.
Why This Sprint Model Works
One feature, fully scoped
We do not start writing code until the spec, edge cases, and acceptance criteria are agreed on, so the sprint does not turn into open-ended discovery.
Built inside your codebase
We work in your repo, following your conventions and deploy process, not a separate branch that needs reconciling later.
Fixed timeline, fixed price
A critical feature sprint is quoted and scheduled as one to three weeks before it starts. No open hourly clock.
Edge cases handled before launch
Payment failures, API timeouts, and permission edge cases are defined and tested during the sprint, not discovered by your first users.
Why This Sprint Model Works
One feature, fully scoped
We do not start writing code until the spec, edge cases, and acceptance criteria are agreed on, so the sprint does not turn into open-ended discovery.
Built inside your codebase
We work in your repo, following your conventions and deploy process, not a separate branch that needs reconciling later.
Fixed timeline, fixed price
A critical feature sprint is quoted and scheduled as one to three weeks before it starts. No open hourly clock.
Edge cases handled before launch
Payment failures, API timeouts, and permission edge cases are defined and tested during the sprint, not discovered by your first users.
Critical Feature Build FAQ
Post-MVP iteration is an ongoing engagement: recurring sprints, prioritized from usage data, covering multiple features over months. A critical feature build is a single, tightly scoped sprint for one specific feature you already know you need, typically because it's blocking a launch, a contract, or a fundraise. There's no ongoing retainer; it starts and ends with that one feature shipped.
Anything blocking revenue, a signed contract, or a compliance requirement: a payment flow that has to work before a launch date, an SSO integration a customer is requiring before they'll sign, or an AI feature a competitor just shipped. If it needs to exist and be reliable within a few weeks, it fits this model.
We need read and write access to the specific repo, plus a scoped environment to deploy to, either staging or a feature-flagged production path. We do not need access to unrelated systems, and we work under an NDA before any code access happens.
That should surface during scoping, before the sprint starts, which is why we do not skip that step. If genuinely new complexity is discovered mid-sprint, we flag it immediately and re-scope rather than silently running over.
That's the default model. We ship the feature into your repo, document it, and run a handoff walkthrough. Ongoing maintenance is your team's from that point, unless you want to move into a post-MVP iteration or team augmentation engagement.
Trusted by Global Companies Building AI Products
We've helped startups and enterprises worldwide transform their AI ideas into production-ready MVPs in 2–3 weeks. From fintech platforms to AI assistants, our global MVP development services have launched 18+ AI products serving users across the US, Europe, and Asia.
Portfolio: AI Products Built for Global Startups
From content platforms and AI assistants to analytics dashboards and fintech solutions: see how we've transformed ideas into production-ready MVPs in 2-3 weeks across diverse industries. Each product launched successfully, serving users globally.
UseArticle
AI-powered content creation and management platform that helps teams produce high-quality articles at scale.
AgentHi
Intelligent virtual assistant that streamlines customer support and automates routine business tasks.
StatsHub
Comprehensive analytics dashboard providing real-time insights and data visualization for businesses.
Harimaxx
Personal fitness companion with AI-driven workout plans and nutrition tracking for optimal health.
Vaga
Smart travel planning app that curates personalized itineraries and local experiences.
FoodScan
Nutrition analysis app that scans food items and provides detailed nutritional information instantly.
MyJobReach
Job matching platform connecting talented professionals with their dream opportunities.
TravelGram
Social platform for travelers to share experiences, discover destinations, and connect globally.
SuperStatz
Advanced sports statistics platform delivering in-depth analysis and performance metrics.
Cashbook
Simple expense tracking and budgeting app that helps users manage their finances effortlessly.
TypeFast
Typing speed improvement platform with gamified lessons and real-time performance tracking.
Easy Loan
Streamlined loan management system that simplifies borrowing and lending processes.
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