REST API Developer

McLean, VA

Full Time

Mid Level

About Infinitive:
Infinitive is a data and AI consultancy that enables its clients to modernize, monetize and operationalize their data to create lasting and substantial value. . We possess deep industry and technology expertise to drive and sustain adoption of new capabilities. We match our people and personalities to our clients' culture while bringing the right mix of talent and skills to enable high return on investment.

Infinitive has been named “Best Small Firms to Work For” by Consulting Magazine 8 times most recently in 2025. Infinitive has also been named a Washington Post “Top Workplace”, Washington Business Journal “Best Places to Work”, and Virginia Business “Best Places to Work.”

Role Overview:
We are looking for a skilled REST API Developer to join our team in support of a large financial services institution. You will be responsible for developing and maintaining the APIs that facilitate our financial services, ensuring they are efficient, secure, and seamlessly integrated with our AWS cloud environment. This is a role for a builder who enjoys solving technical challenges within the fast-paced world of financial technology.

Key Responsibilities

API Development: Build and maintain RESTful web services using modern backend languages (e.g., Node.js, Python, or Java).
AWS Integration: Deploy and manage services within the AWS ecosystem, specifically utilizing Lambda, API Gateway, and S3.
Financial Data Handling: Implement logic for financial transactions, account management, and data validation, ensuring high precision and accuracy.
Database Management: Write and optimize queries for both SQL (PostgreSQL/MySQL) and NoSQL (DynamoDB) databases.
Collaboration: Work closely with front-end developers and product managers to define API contracts and deliver features that meet business requirements.
Maintenance: Monitor API performance, troubleshoot bugs, and provide timely fixes to ensure high availability for our customers.

Qualifications

Experience: 2–4 years of professional experience in backend development.
Domain Knowledge: Previous experience working within Financial Services, Fintech, or a highly regulated industry (e.g., insurance or healthcare).
Cloud Basics: Solid grasp of cloud computing concepts and serverless architecture.
Problem Solving: Ability to debug complex issues across asynchronous services.
Communication: Clear verbal and written skills for documenting API endpoints and collaborating with the team.
Technical Proficiency: Strong understanding of REST principles, HTTP methods, JSON, and version control (Git).

Preferred Skills

Experience with automated testing frameworks (Jest, PyTest, or Mocha).
Familiarity with Docker and containerization basics.
Basic understanding of CI/CD pipelines (GitHub Actions, Jenkins, or AWS CodePipeline).
Knowledge of financial compliance standards like PCI-DSS.

Apply for this position

Required*

First Name*

Last Name*

Email Address*

Phone*

Address

Resume*

We've received your resume. Click here to update it.

Attach resume or Paste resume

Attach resume as .pdf, .doc, .docx, .odt, .txt, or .rtf (limit 5MB) or Paste resume

Paste your resume here or Attach resume file

Are you currently legally authorized to work in the US for any employer?*

Is your work visa currently being sponsored by an employer?

Are you eligible to be hired by Infinitive as a full-time employee without the need for Infinitive visa sponsorship at any time during your employment?*

Are you local to the greater Washington DC metropolitan area or based on the east coast?*

Human Check*

Submit Application

Thanks for visiting our Career Page. Please review our open positions and apply to the positions that match your qualifications.

REST API Developer

Key Responsibilities

Qualifications

Preferred Skills

Apply for this position