NET Full Stack Developer

21 hours ago

Gurgaon, Haryana, India Capital Numbers Full time ₹ 12,00,000 - ₹ 36,00,000 per year

We are seeking a highly skilled
Senior Full Stack Developer
to design, build, and scale secure financial and payment applications. This role requires strong expertise in
.NET technologies, modern frontend frameworks, cloud platforms (AWS), and deep understanding of payment protocols and standards
.

You will be part of a cross-functional team and responsible for the full software development lifecycle—from architecture and development to deployment, testing, and post-implementation support.

Key Responsibilities:

Architecture & System Design

  • Design scalable and modular software using
    Clean Architecture
    and
    SOLID principles
    .
  • Implement
    CQRS (Command Query Responsibility Segregation)
    and asynchronous messaging patterns.
  • Participate in architectural reviews and ensure adherence to best practices.

Software Development

  • Develop backend services using
    C#, .NET Framework, .NET Core, MVC, EF, and REST APIs
    .
  • Build responsive and secure front-end applications using
    / React / Angular
    .
  • Integrate payment SDKs, third-party APIs, and secure payment forms.
  • Write clean, reusable, and well-documented code following industry coding standards.

Payments & Banking Domain

  • Implement solutions using
    ISO 8583 / ISO 20022
    protocols.
  • Work with card issuance, payment gateways (Stripe, PayPal), and tokenization systems.
  • Implement multi-currency transaction workflows (authorization, capture, refund).
  • Apply encryption (AES/RSA), OAuth2, and JWT-based authentication.
  • Mitigate security threats such as SQL injection, CSRF, and XSS.

Database & Data Handling

  • Design and optimize relational database schemas (MS SQL Server, MySQL, PostgreSQL).
  • Implement stored procedures, indexing, partitioning, and high-performance transactions.
  • Manage NoSQL systems like DynamoDB for session and cache scenarios.
  • Ensure encryption at rest and in transit using AWS KMS / Secrets Manager.

Testing & Code Quality

  • Develop unit, integration, and end-to-end tests.
  • Conduct code reviews and troubleshoot complex issues.
  • Ensure full QA alignment before deployment.

DevOps & Cloud

  • Build CI/CD pipelines using
    Azure DevOps
    .
  • Use Docker & Kubernetes for containerization and orchestration.
  • Deploy and monitor applications using
    AWS services
    (Lambda, API Gateway, CloudWatch, X-Ray).
  • Use Infrastructure-as-Code tools like
    CloudFormation or Terraform
    .

Collaboration & Process Improvement

  • Work closely with cross-functional teams including product, design, QA, infrastructure, and operations.
  • Identify process improvements and contribute to best practices.
  • Support deployments and participate in production issue resolution.

Required Skills & Qualifications:

  • 8+ years
    of full stack development experience.
  • 3+ years
    experience in
    banking, card issuance, or payment systems
    (mandatory).
  • Strong expertise in:
  • .NET Core, C#, ASP.NET MVC, Web APIs
  • Frontend frameworks )
  • SQL databases (MS SQL Server)
  • Payment APIs, tokenization, encryption
  • ISO 8583/20022 protocols
  • OAuth2, JWT, and security standards
  • AWS cloud services & containerization
  • CQRS, Clean Architecture, SOLID principles

Preferred Skills:

  • Experience with
    Keycloak
    .
  • Knowledge of
    AWS SageMaker
    for fraud detection models.
  • Migration experience from
    .NET Framework → .NET Core/8+
    .
  • Understanding of
    PCI DSS, PSD2, 3D Secure 2.0
    .
  • Ability to debug and optimize large-scale distributed systems.

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