Senior Federal Integration Engineer – Middleware & APIs

Federal Advisory Partners; United States; On-site; USD 120,000 - 155,000; Full time

Job summary

Tria Federal is seeking an Integration Developer / Middleware Specialist to design and implement end‑to‑end integrations across Appian, Palantir, and VA legacy financial systems. You will architect middleware, API contracts, and secure data exchanges to ensure auditable, scalable processing for contract actions.

The role requires 8+ years in software development with a focus on enterprise integration, expertise in REST/OpenAPI, and hands‑on experience with middleware technologies.

Qualifications

• 8+ years of software development experience with at least 5 years focused on enterprise system integration and middleware development.
• RESTful API design and development, including OpenAPI/Swagger specification.
• Experience with enterprise integration patterns including event‑driven architectures, message queues, and ESB/iPaaS platforms.
• Proficiency in one or more integration‑relevant programming languages (Java, Python, Node.js) and integration frameworks.
• Experience integrating COTS platforms with federal legacy systems in VA or comparable civilian agency environments.
• Working knowledge of federal security standards (NIST SP 800‑53, TLS/mTLS, OAuth 2.0/OIDC) as applied to system integrations.
• Bachelor's degree in Computer Science, Software Engineering, or related technical field required.
• Active or ability to obtain government security clearance.

Responsibilities

• Design and implement the full integration architecture for VAASM, including API specifications, data exchange contracts, and middleware patterns.
• Develop and maintain all system integration components connecting Appian, Palantir, VA legacy financial systems (OLCS, UFMS, IPPS), and enterprise services.
• Build and test automated funds check interfaces that validate funding availability and record legal obligations upon contract award.
• Implement real-time LOA data linkages connecting contract line items to financial management systems for end‑to‑end obligation traceability.
• Develop API gateway configurations, authentication/authorization flows, and integration security controls in alignment with VA OIT requirements.
• Maintain API documentation, integration runbooks, and system‑to‑system data dictionaries for all integration touchpoints.
• Collaborate with the Enterprise Architect to ensure all integration designs adhere to the program's architectural standards and VA technology guidelines.
• Support integration testing activities, including developing test cases for end‑to‑end data flow validation and regression testing.
• Participate in ATO support activities, providing integration‑specific security documentation, data flow diagrams, and control evidence.
• Troubleshoot and resolve integration performance and reliability issues in test and production environments.
• Mentor junior developers and data engineers on integration best practices and API development standards.

Skills

REST API design

OpenAPI/Swagger

Integration patterns

Event-driven

Message queues

ESB/iPaaS

Java

Python

Node.js

Security standards

Security clearance

Education

Bachelor's degree in CS/SE or related

Tools

Appian Connected Systems

Web API capabilities

MuleSoft

IBM MQ

Job description

Tria Federal is seeking an Integration Developer / Middleware Specialist to design and implement end‑to‑end integrations across Appian, Palantir, and VA legacy financial systems. You will architect middleware, API contracts, and secure data exchanges to ensure auditable, scalable processing for contract actions.

The role requires 8+ years in software development with a focus on enterprise integration, expertise in REST/OpenAPI, and hands‑on experience with middleware technologies.