Job Description

We are looking for an experienced

Freelance Mobile App Developer

capable of building a

fully functional, highly secure B2B mobile application

for both

Android and iOS

platforms. The ideal candidate must be able to

develop the entire application from scratch (hardcoded/manual coding)

with clean architecture, optimized performance, and a professional-grade user experience.

This is a full-cycle development project where the final deliverable will be a

production-ready mobile app

with all backend and frontend components fully integrated.

Responsibilities

Develop a

robust, scalable, and secure B2B mobile application

for Android and iOS using native or cross-platform technologies. Write clean, maintainable, and well-documented code (hardcoded/manual coding--no no-code/low-code tools). Build and integrate a

secure backend

, including: Database design and setup API development and integration Oauth authentication and user management Role-based access control (RBAC) Integrate

secure payment gateway(s)

and ensure compliance with industry standards. Implement best-in-class application security practices (data encryption, secure storage, secure API communication). Ensure UI/UX implementation matches the design and provides a smooth user experience. Perform full QA testing (unit, integration, performance). Deploy applications to the Google Play Store and Apple App Store. Provide documentation and minimal training/technical handover upon completion.

Required Skills & Qualifications

3+ years of professional mobile app development experience

(Android and iOS). Proven experience building and launching

production-ready mobile apps

. Strong proficiency in:

Android:

Kotlin/Java

iOS:

Swift or

Cross-platform:

Flutter / React Native (if applicable) Solid understanding of

backend development

, including Node.js, Django, Laravel, or similar frameworks. Experience with

RESTful APIs

, database systems (MySQL, PostgreSQL, MongoDB), and cloud platforms (AWS, Firebase, GCP, etc.). Hands-on experience integrating

payment gateways

(Stripe, Razorpay, PayPal, etc.). Strong understanding of

OAuth 2.0, JWT, and other authentication frameworks

. Familiarity with

CI/CD

, version control (Git), and app store submission processes. Ability to develop secure applications following industry standards (OWASP Mobile Security). Excellent communication skills and ability to work independently with minimal supervision.

Preferred Qualifications

Experience building

B2B or enterprise-grade applications

. Knowledge of microservices or serverless architecture. Experience with analytics, push notifications, and real-time features. Familiarity with DevOps tools and automated deployment pipelines.

Deliverables

Complete Android and iOS applications (production-ready). Fully integrated backend (database, APIs, authentication, admin panel if needed). Fully integrated payment gateway. Secure login system using

OAuth

. Complete source code with documentation. Assistance with app store publication. Post-launch support for a defined period (optional/negotiable).
Job Type: Freelance

Work Location: Remote