Java API Developer

Ascendion; New York (NY); On-site; USD 100,000 - 120,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) retirement plan

Long-term disability insurance

Short-term disability insurance

5 personal days per year

10–15 days vacation per year

6 holidays + 1 floating holiday

Ascendion Learning Management System

Job summary

Ascendion is seeking a skilled Backend/API Developer for an onsite role in Manhattan, NY. You will design, implement, and maintain RESTful and GraphQL APIs, build scalable microservices, and integrate diverse systems through secure APIs.

The ideal candidate has 3+ years of experience with modern backend frameworks, strong SQL skills, API security knowledge, and hands-on Docker/Kubernetes experience. Join a culture focused on opportunity and innovation.

Qualifications

• Bachelor's degree in CS/Engineering/IT or related field.
• 3+ years of backend/API development and integration.
• Experience with Spring Boot, ASP.NET Core, Express.js, FastAPI, Micronaut, or Quarkus.
• Strong SQL skills and experience with relational and NoSQL databases.
• Knowledge of OAuth 2.0, JWT, and OpenID Connect.
• Experience with Swagger/OpenAPI for API docs.
• Git and CI/CD pipelines experience.
• Docker and Kubernetes experience; cloud familiarity (AWS/Azure/GCP).
• Proficiency in Agile/Scrum environments.

Responsibilities

• Design, develop, test, and maintain RESTful and GraphQL APIs.
• Build scalable microservices using modern backend frameworks.
• Integrate enterprise applications, databases, and third-party platforms via APIs.
• Develop secure APIs using OAuth 2.0, JWT, OpenID Connect.
• Create and maintain API documentation with Swagger/OpenAPI.
• Optimize API performance, availability, and reliability.
• Deploy and maintain applications using CI/CD pipelines.
• Work in Docker and Kubernetes containerized environments.
• Collaborate with cross-functional teams across the SDLC.

Skills

RESTful API development

GraphQL APIs

SQL databases

API security

Agile/Scrum

Problem solving

Communication

Education

Bachelor's degree in CS/Engineering/IT

Tools

Spring Boot

ASP.NET Core

Express.js

FastAPI

Micronaut

Quarkus

Docker

Kubernetes

Git

CI/CD

Swagger/OpenAPI

OAuth 2.0

JWT

OpenID Connect

AWS

Azure

GCP

Job description

Ascendion is a full-service digital engineering solutions company. We make and manage software platforms and products that power growth and deliver captivating experiences to consumers and employees. Our engineering, cloud, data, experience design, and talent solution capabilities accelerate transformation and impact for enterprise clients. Headquartered in New Jersey, our workforce of 6,000+ Ascenders delivers solutions from around the globe. Ascendion is built differently to engineer the next.

Ascendion | Engineering to elevate life

We have a culture built on opportunity, inclusion, and a spirit of partnership. Come, change the world with us:

• Build the coolest tech for world’s leading brands
• Solve complex problems - and learn new skills
• Experience the power of transforming digital engineering for Fortune 500 clients
• Master your craft with leading training programs and hands‑on experience

Experience a community of change makers!

Join a culture of high-performing innovators with endless ideas and a passion for tech. Our culture is the fabric of our company, and it is what makes us unique and diverse. The way we share ideas, learning, experiences, successes, and joy allows everyone to be their best at Ascendion.

About the Role:

Key Responsibilities:

• Design, develop, test, and maintain RESTful and GraphQL APIs.
• Build scalable microservices using modern backend frameworks and architecture patterns.
• Integrate enterprise applications, databases, and third‑party platforms through APIs.
• Develop secure APIs using OAuth 2.0, JWT, API Keys, and OpenID Connect.
• Create and maintain API documentation using Swagger/OpenAPI specifications.
• Optimize API performance, availability, scalability, and reliability.
• Develop reusable backend services and business logic components.
• Collaborate with cross-functional teams including Frontend, Architecture, QA, DevOps, and Product Management.
• Implement unit testing, integration testing, and automated API testing frameworks.
• Monitor APIs, analyze logs, and troubleshoot production incidents.
• Participate in code reviews and ensure adherence to secure coding standards and best practices.
• Deploy and maintain applications using CI/CD pipelines.
• Work in containerized environments using Docker and Kubernetes.
• Participate in Agile/Scrum ceremonies and contribute throughout the software development lifecycle.

Minimum Qualifications:

• Bachelor's degree in Computer Science, Engineering, Information Technology, or a related field.
• 3+ years of experience in backend/API development and integration.
• Experience with at least one modern backend framework such as Spring Boot, ASP.NET Core, Express.js, FastAPI, Micronaut, or Quarkus.
• Strong SQL skills and experience working with relational and/or NoSQL databases.
• Knowledge of API security standards including OAuth 2.0, JWT, and OpenID Connect.
• Experience with API documentation tools such as Swagger/OpenAPI.
• Familiarity with source control systems (Git) and CI/CD pipelines.
• Experience working with Docker and containerized applications.
• Understanding of cloud platforms such as AWS, Azure, or GCP.
• Experience with unit testing, integration testing, and API automation testing.
• Strong problem-solving, analytical, and communication skills.
• Experience working in Agile/Scrum development environments.

Desired Qualifications:

• Banking and Financial Industry experience.
• Experience working with additional backend frameworks, databases, and cloud technologies.
• Knowledge of advanced DevOps practices and infrastructure automation tools.
• Familiarity with event-driven architectures and messaging platforms.
• Understanding of modern security protocols, API governance, and compliance requirements.
• Experience with API lifecycle management and monitoring solutions.
• Proficiency in additional testing frameworks and automated testing methodologies.

Location:Manhattan, NY (Onsite Role)

Salary Range:

The salaryfor this position is between$100,000 - $120,000 annually. Factors which may affect pay within this range may include geography/market, skills, education, experience, and other qualifications of the successful candidate.

Benefits:

The Company offers the following benefits for this position, subject to applicable eligibility requirements:

• medical insurance
• dental insurance
• vision insurance
• 401(k) retirement plan
• long-term disability insurance
• short-term disability insurance
• 5 personal days accrued each calendar year. The Paid time off benefits meet the paid sick and safe time laws that pertains to the City/ State
• 10-15 days of paid vacation time
• 6 paid holidays and 1 floating holiday per calendar year
• Ascendion Learning Management System

Want to change the world? Let us know.

Tell us about your experiences, education, and ambitions. Bring your knowledge, unique viewpoint, and creativity to the table. Let’s talk!