Senior Backend API Developer - Cloud Migration & Microservices

Enterprise API Developer | .NET, Java, Cloud Migration, API Security, Microservices

Job Summary
Synechron is seeking an experienced Backend .NET Developer to lead the development and migration of API solutions within our banking and payments platform. This role involves designing, building, and refactoring legacy APIs into cloud-native microservices, leveraging .NET and Java technologies. You will be responsible for ensuring high-performance, scalable, and secure API solutions aligned with industry standards such as BIAN, and supporting enterprise infrastructure integration with major record systems like SAP, HCL, and mainframes. As a key contributor, you will drive technical excellence, promote best practices, and support continuous delivery in a dynamic, fast-paced environment.

Software Requirements

• Required: .NET Framework and .NET Core (version 5+), C# or Kotlin, REST API development, CI/CD tools (GitHub, GitHub Actions, TeamCity), Docker, Kubernetes, Azure DevOps, SQL (Microsoft SQL Server, Oracle, MySQL), API gateways (Kong, AWS API Gateway)

• Preferred: AWS CDK, serverless architecture (AWS Lambda, Fargate, EKS), security frameworks (OAuth2, IAM Roles & Policies), monitoring/logging tools (Splunk, AppDynamics, CloudWatch), API management tools, Java, Spring Boot, OpenAPI/Swagger

• Experience level: 7–10 years in enterprise API development, migration, and cloud-native architecture

Overall Responsibilities

• Lead design, development, and deployment of microservices architectures using .NET, Java, and cloud technologies

• Migrate legacy APIs to cloud-native environments leveraging AWS, Azure, or GCP and refactor APIs to improve scalability and resilience

• Develop and maintain scalable, secure REST and SOAP APIs based on BIAN standards for banking systems and payment gateways

• Collaborate with architecture, security, and business teams to define and implement API security, access control, and compliance measures

• Lead code reviews, enforce best practices, and promote DevOps principles within the team

• Automate deployment, testing, and monitoring processes to ensure continuous delivery and operational stability

• Troubleshoot, diagnose, and resolve technical issues related to APIs, system integration, and infrastructure performance

• Support new project initiatives, POC development, and system enhancements supporting the enterprise roadmap

• Maintain comprehensive documentation including technical specifications, API catalogs, and operational guidelines

Technical Skills (By Category)

• Programming Languages:

  • Essential: C#, .NET Framework and Core, Java, JavaScript, TypeScript, REST API, SOAP, Spring Boot (preferred)

  • Preferred: Kotlin, Python, Groovy for scripting and automation projects

• Databases & Data Management:

  • SQL Server, Oracle, MySQL, data validation, schema design, query optimization, data migration techniques

• Cloud Technologies:

  • AWS (Lambda, Fargate, EKS, IAM, API Gateway), Azure (Function Apps, API Management, Virtual Networks), GCP (basic knowledge)

• Frameworks & Libraries:

  • .NET Core, Spring Boot, Hibernate, REST API, OAuth2, JWT, OpenAPI/Swagger, API Gateway integrations

• Development Tools & Methodologies:

  • Git, Jenkins, Azure DevOps, TeamCity, Docker, Kubernetes, Agile/Scrum, DevSecOps, TDD/BDD

• Security & Compliance:

  • API security protocols, data encryption, identity and access management, regulatory standards (HIPAA, GDPR, SOC)

Experience Requirements

• 7+ years in enterprise API development, migration, and cloud-native architecture support

• Proven experience refactoring legacy systems to modern, scalable APIs on cloud platforms

• Strong background in implementing secure, high-availability, multi-tenant API solutions

• Experience working in banking, financial services, or regulated enterprise environments is advantageous; extensive enterprise API experience in other sectors is acceptable

Day-to-Day Activities

• Develop and deploy scalable microservices APIs supporting banking and payment transactions

• Lead migration efforts for legacy APIs into cloud-native environments, refactoring for resilience and performance

• Collaborate with security, architecture, and business teams to meet technical and compliance standards

• Conduct code reviews, enforce best practices, and mentor junior developers

• Troubleshoot and resolve API performance and security issues swiftly

• Automate deployment pipelines and system monitoring tasks to support continuous integration and delivery

• Document system architecture, API specifications, and operational procedures

• Participate in Agile ceremonies, sprint planning, and technical reviews

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Software Engineering, or relevant discipline

• 7+ years designing, developing, and migrating enterprise APIs with .NET and Java technologies

• Certifications such as AWS Solutions Architect, Azure Developer, or API security (preferred)

• Strong troubleshooting, security, and performance optimization skills

• Ability to work independently and lead technical projects effectively

Professional Competencies

• Analytical thinking and problem-solving skills for complex migration and API challenges

• Leadership and mentorship abilities for guiding team efforts

• Excellent stakeholder communication to translate technical details to non-technical audiences

• Adaptability and continuous learning to stay current with emerging cloud and API management solutions

• Ownership of security, scalability, and operational excellence initiatives

• Strong time and project management skills to handle multiple priorities efficiently

S​YNECHRON’S DIVERSITY & INCLUSION STATEMENT

Diversity & Inclusion are fundamental to our culture, and Synechron is proud to be an equal opportunity workplace and is an affirmative action employer. Our Diversity, Equity, and Inclusion (DEI) initiative ‘Same Difference’ is committed to fostering an inclusive culture – promoting equality, diversity and an environment that is respectful to all. We strongly believe that a diverse workforce helps build stronger, successful businesses as a global company. We encourage applicants from across diverse backgrounds, race, ethnicities, religion, age, marital status, gender, sexual orientations, or disabilities to apply. We empower our global workforce by offering flexible workplace arrangements, mentoring, internal mobility, learning and development programs, and more.

All employment decisions at Synechron are based on business needs, job requirements and individual qualifications, without regard to the applicant’s gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law.

Candidate Application Notice

Experience Level

Senior Level