Sr Application Developer

Senior Application Developer (API Management & SOA Platforms)

Role Overview

We are seeking an experienced, communicative, and technically accomplished Senior Application Developer to join our Infrastructure, Platforms & Operations portfolio team. In this role, you will develop and maintain robust APIs for multiple lines of business within an efficient Agile SDLC while acting as a core advocate for our enterprise API Management platform. You will partner directly with application developers, architects, and business analysts to evangelize SOA best practices focused on scalability, maintainability, and code reuse.

This is a long-term contract engagement running through December 31, 2027, for a software professional who thrives in a collaborative, rapidly evolving environment. You will accelerate customer adoption, increase platform engagement, and leverage your expertise in microservices and API gateways to deliver secure, reliable IT products and services. If you possess a strong background in enterprise integration and API development, we want to hear from you.

Key Responsibilities

API Development & Platform Advocacy

API Lifecycle Management: Design, develop, test, and maintain scalable APIs and microservices across multiple lines of business using enterprise API gateway platforms.

P latform Evangelism: Partner with and enable internal application developers to adopt Service-Oriented Architecture (SOA) best practices, focusing on performance, system resilience, and code reuse.

Cross-Functional Collaboration: Work closely with Architects, Engineers, Business Analysts, and Service Managers in a fast-paced environment to align technology delivery with business strategy.

Operational Support: Participate in operational support rotations, diagnose and resolve integration issues, and ensure high availability across API ecosystems.

Quality & Delivery

Agile Execution: Deliver software solutions within an efficient Agile SDLC, participating in backlog grooming, sprint planning, and cross-team code reviews.

Quality Assurance: Ensure high standards of code quality, performance optimization, and rigorous testing throughout the application development lifecycle.

Qualifications & Requirements

Minimum Qualifications

Citizenship / Work Status: U.S. Citizenship or is strictly required due to background check and vetting policies.

Education: Bachelor's degree in Computer Science, Information Systems, or a related technical discipline (or equivalent practical work experience).

Experience Baseline: Minimum of 5+ years of professional experience spanning programming, analysis, software design, development implementation, QA, and application support.

Technical Mastery:

oPractical, hands-on experience and deep knowledge of Service-Oriented Architecture (SOA), Microservices, and API Gateways.

oDemonstrated development experience with at least one major API gateway technology (e.g., MuleSoft, Apigee Edge, 3Scale, CA Technologies, TIBCO Mashery, Axway, or IBM API Gateway).

Clearance Requirement: Ability to successfully undergo and clear required background check vetting (e.g., Peraton Moderate risk screening).

Core Competencies: Stellar leadership, presentation, and interpersonal communication skills; proven ability to learn complex business domains quickly and manage competing priorities.

Preferred Attributes

Prior software engineering experience within the financial services industry or highly regulated enterprise environments.

Strong background supporting distributed microservice architectures in cloud or hybrid environments.

Equal Opportunity Employer / Disabled / Protected Veterans

The Know Your Rights poster is available here:

_EEOC_KnowYourRights6.12.pdf

The pay transparency policy is available here:

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For temporary assignments lasting 13 weeks or longer, AllSTEM Connections is pleased to offer major medical, dental, vision, 401k and any statutory sick pay where required.

We are committed to working with and providing reasonable accommodations to individuals with disabilities. If you need a reasonable accommodation for any part of the employment process, please contact your staffing representative who will reach out to our HR team.

AllSTEM Connections participates in the E-Verify program in certain locations as required by law. Learn more about the E-Verify program.

_Participation_Poster_ES.pdf

We also consider for employment qualified applicants regardless of criminal histories, consistent with legal requirements, including, if applicable, the City of Los Angeles' Fair Chance Initiative for Hiring Ordinance. Pursuant to applicable state and municipal Fair Chance Laws and Ordinances, we will consider for employment-qualified applicants with arrest and conviction records, including, if applicable, the San Francisco Fair Chance Ordinance. For Los Angeles, CA applicants: Qualified applications with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act.

Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

Additional Skills

(none specified)

AllSTEM Representative Contact Info

Account Executive:

Nichols

Branch

Location:

Ontario, CA