Senior Level Senior Application Developer Jobs

Senior Application Developer – Custom eCommerce

Location: McKinney, TX – Onsite
Position Type: C2H

Job Overview

We are looking for a Senior Application Developer with strong hands-on experience building custom B2B and B2C eCommerce applications using modern web technologies such as React.js and Next.js. This is a hands-on senior engineering role responsible for designing, developing, integrating, and supporting scalable, high-performance, end-to-end eCommerce solutions. The ideal candidate should have a strong background in custom eCommerce application development, modern frontend architectures, API-driven applications, backend integrations, and cloud platforms. The candidate will work closely with Product, UX, Mobile, Integration, Platform, and other cross-functional teams to transform business requirements into secure, scalable, performant digital experiences.

Key Responsibilities

Custom eCommerce Application Development

- Design, develop, and enhance custom B2B and B2C eCommerce applications.
- Build modern, scalable, high-performance web applications using React.js, Next.js, JavaScript/TypeScript, and related technologies.
- Develop reusable frontend components, application modules, and shared UI capabilities.
- Translate business and functional requirements into technical designs and production-ready implementations.
- Develop end-to-end features across frontend, backend services, APIs, integrations, and cloud environments.
- Troubleshoot, optimize, and enhance existing eCommerce applications.

Frontend Architecture & UI Engineering

- Design and implement modern, modular UI architectures.
- Work with architectural patterns such as:
- Micro-Frontend Architecture
- MicroApps
- Web Components
- Atomic Design
- Server-Driven UI
- Backend-for-Frontend (BFF)
- Build reusable component libraries and scalable design-system capabilities.
- Ensure responsive, accessible, performant, and maintainable user experiences.

API & Integration Development

- Design, develop, and integrate RESTful APIs and/or GraphQL services.
- Build API-driven application architectures supporting eCommerce workflows.
- Integrate frontend applications with backend services, third-party platforms, and enterprise systems.
- Collaborate with integration and platform teams to deliver cohesive end-to-end solutions.

eCommerce Engineering

- Apply strong understanding of core eCommerce concepts and workflows.
- Develop solutions supporting B2B and B2C customer journeys.
- Work across capabilities such as product, catalog, pricing, customer, cart, checkout, order, and related eCommerce functionality.
- Contribute to scalable and composable eCommerce architectures.

Cloud & DevOps

- Develop and deploy applications using cloud platforms such as Azure or AWS.
- Work with CI/CD pipelines and modern DevOps practices.
- Use Git/Bitbucket and established source-control and development workflows.
- Support application deployment, troubleshooting, and production releases.

Performance, Security & Quality

- Identify and resolve application performance issues.
- Apply web application security best practices.
- Conduct code reviews and promote clean, maintainable, and reusable code.
- Develop and maintain appropriate unit/integration testing.
- Ensure solutions meet scalability, reliability, security, and performance requirements.

Collaboration & Technical Leadership

- Collaborate with Product Owners, UX, Mobile, Integration, Platform, and other engineering teams.
- Participate in Agile development processes.
- Mentor junior and mid-level developers.
- Promote engineering best practices, reusable patterns, coding standards, and continuous improvement.

Required Qualifications

- Bachelor's degree in Computer Science, Engineering, or a related field.
- 6+ years of application development experience, preferably with B2B and/or B2C eCommerce platforms.
- Strong hands-on experience building custom eCommerce applications.
- Strong hands-on experience with React.js and Next.js.
- Strong JavaScript/TypeScript development experience.
- Experience designing and developing modular, reusable UI architectures.
- Experience building API-driven applications.
- Hands-on experience developing and integrating RESTful APIs and/or GraphQL.
- Strong understanding of eCommerce concepts, customer journeys, and transactional workflows.
- Experience with Azure and/or AWS.
- Experience with CI/CD, DevOps practices, and Git/Bitbucket.
- Strong understanding of web application security and performance optimization.
- Strong communication, collaboration, troubleshooting, and problem-solving skills.
- Experience working in an Agile environment.

Preferred Qualifications

- Experience with PHP and Adobe Commerce/Magento.
- Experience with micro-frontends, MicroApps, Web Components, design systems, or shared component libraries.
- Experience with composable commerce and MACH architecture.
- Experience with Server-Driven UI and/or Backend-for-Frontend (BFF) architecture.
- Experience with analytics platforms such as Google Analytics or Adobe Analytics.
- Experience with observability and monitoring tools such as New Relic or Azure Monitor.