endorsedCompleted

FinTech MVP: Mobile & Web App Development

Services Covered:

Mobile Application Development • API Development • Application Integration • Cloud Consulting and Services • DevOps • Software Product Development

Industry

Financial Services

Duration

9 months

Budget

50K - 199K

Start Date

1 July 2023

Team Size

1-5 Employees

Engagement Model

Onshore

Project Capability Score (PCS)

75/100

Good

Project Capability Score (PCS) estimates how capable Interexy is of successfully delivering a project like this, based on its past experience, track record, and ability to handle similar work. Learn more about PCS

Client

Confidential

Dallas, United States of America

Project Summary

Interexy provided end-to-end mobile and web app development for a fintech startup, delivering iOS and Android apps, a REST API backend, and a DevOps setup. The vendor developed core features including user onboarding, account linking, transaction aggregation, automated budgeting, and a loan underwriting engine, integrating multiple third-party APIs. The team maintained high code quality, consistent sprint delivery, and comprehensive documentation while serving as an extension of the in-house engineering team.

Key Challenges

Develop initial proof of concepts for necessary third-party integrations for the product MVP
Build the underlying product platform alongside initial mobile and web application clients designed for end-users

Project Deliverables

iOS and Android mobile applications built using React Native with feature parity
RESTful API back-end powered by Node.js, Express and MongoDB
Integration with key third-party APIs
Proprietary loan underwriting engine for alternative-data credit evaluation
Full DevOps setup including development, staging and production environments in AWS
CI/CD pipelines configured in GitHub for automated builds and deployments
Detailed project documentation covering architecture, APIs, and deployment

Project Solution

Interexy delivered end-to-end development for the client's flagship mobile and web applications. The vendor collaborated on requirements and product roadmap, designed the application architecture, built React Native front-end apps for iOS and Android, and implemented a RESTful backend using Node.js, NestJS, Express and MongoDB. They integrated multiple third-party APIs (data aggregation, payments, authentication), implemented core product features (user onboarding, account linking, transaction analytics, budgeting, debt tracking, loan underwriting algorithms), and established AWS-based development/staging/production environments with CI/CD pipelines in GitHub. The engagement also included documentation and knowledge transfer.

Project Outcome

Approached official consumer launch after an ~8-month end-to-end timeline
Maintained an 80%+ on-time delivery rate across 16+ sprints
Completed all critical backlog features including onboarding with AI/chat and account linking for 15,000 institutions
Delivered transaction aggregation with <100ms response times and automated budgeting handling 50+ categories
Achieved an agile velocity of 40 story points per two-week sprint and kept technical debt below 10% of effort
Implemented a scalable serverless backend and automated CI/CD pipelines, reducing manual deployment effort
Produced comprehensive documentation and performed knowledge transfer

Platforms

Mobile
Web
Cloud

Tech Stack

React Native
Node.js
NestJS
Express.js
MongoDB
Amazon Web Services (AWS)
Serverless
RESTful API

Client Endorsement

Overall Review Rating

4.75

Timeliness

Cost Rating

Willing to Refer

Quality of Deliverables

“Interexy successfully developed and tested all critical backlog features. The team automated budget, creditor payments, and loan payback tracking. The team demonstrated technical expertise and had effective communication. Interexy delivered on time and followed solid principles and design patterns.”
Anonymous
Founder & CEO
Date: 04/17/2024