Senior .NET Developer - Healthcare EDI (X12 275 Specialist)

Project Description

This role supports a high-visibility healthcare payer initiative focused on EDI attachment processing and claims interoperability. The team is responsible for building and enhancing mission-critical EDI pipelines that support HIPAA-compliant transactions, with a strong emphasis on X12 275 attachments linked to 837 claims.
The engineer will work on a modern .NET platform that processes high-volume, high-reliability EDI transactions used by providers, clearinghouses, and government programs (CMS/Medicare). This project directly impacts claims accuracy, turnaround time, regulatory compliance, and provider experience.

Project Initiatives & Impact

• Modernizing and stabilizing EDI attachment processing engines supporting X12 275 transactions
• Improving claims-to-attachment reconciliation (837 ? 275) to reduce payer rework and delays
• Ensuring HIPAA transaction and code set compliance across multiple payer companion guides
• Enhancing binary document handling (PDF, TIFF, JPEG) within EDI workflows
• Strengthening logging, error handling, and resiliency in high-reliability healthcare systems
• Supporting payer integrations with CMS/Medicare and commercial payers to meet regulatory and operational requirements

Required Technical Skills & Experience

.NET Development (Required)

• 5+ years of production .NET development (C#, .NET 6+ preferred)
• Hands-on experience building and maintaining EDI processing pipelines/engines in .NET
• Strong experience with:
  • File I/O, streaming, and binary data handling
  • Batch processing and service-oriented architectures
• Strong practices around:
  • Unit testing
  • Logging
  • Error handling in high-reliability systems
• Development using VS Code (standard IDE)

X12 EDI & HIPAA (Required)

• Hands-on experience with X12 EDI transaction sets, including:
  • 275 - Additional Information to Support a Health Care Claim (primary focus)
  • 837 - Health Care Claim (Professional / Institutional), including 275 linkage
  • 277 - Health Care Claim Status Response
  • 999 - Implementation Acknowledgement
  • 824 - Application Advice
• Deep understanding of EDI envelope structure (ISA / GS / ST)
• Control number generation, matching, and reconciliation
• Experience implementing HIPAA transaction and code set compliance
• Familiarity with syntax rules, separators, and repetition standards

Binary Document & Attachment Handling (Required)

• Experience with MIME encoding/decoding within EDI transactions
• Strong knowledge of Base64 encoding/decoding for embedded payloads (PDF, TIFF, JPEG)
• Understanding of:
  • Payer-specific attachment size limits
  • Chunking strategies
• Knowledge of BIN/BDS segment usage

Payer Companion Guide Experience (Required)

• Candidates must have implemented at least two payer companion guides
• Highly relevant experience includes:
  • CMS / Medicare (required baseline)
  • UnitedHealthcare (UHC)
  • Anthem / Elevance Health
  • Highmark
  • State Medicaid programs

Additional Skills & Qualifications (Preferred)

• Experience with healthcare payer platforms such as HealthEdge (HealthRules Payor)
• Clearinghouse integrations (e.g., Availity)
• Azure services:
  • Service Bus
  • Blob Storage
  • Azure Functions
• Databricks
• GitHub
• Informatica Intelligent Cloud Services (IICS)

Industry Experience

• Payer-side healthcare EDI experience is required
• Experience working in regulated environments (healthcare, insurance, Medicaid/Medicare) strongly preferred

Job Type & Location
This is a Contract position based out of Omaha, NE.
Pay and Benefits
The pay range for this position is $70.00 - $90.00/hr.
Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following:
Medical, dental & vision
Critical Illness, Accident, and Hospital
401(k) Retirement Plan - Pre-tax and Roth post-tax contributions available
Life Insurance (Voluntary Life & AD&D for the employee and dependents)
Short and long-term disability
Health Spending Account (HSA)
Transportation benefits
Employee Assistance Program
Time Off/Leave (PTO, Vacation or Sick Leave)
Workplace Type
This is a fully remote position.
Application Deadline
This position is anticipated to close on Apr 30, 2026.
>About TEKsystems:
We're partners in transformation. We help clients activate ideas and solutions to take advantage of a new world of opportunity. We are a team of 80,000 strong, working with over 6,000 clients, including 80% of the Fortune 500, across North America, Europe and Asia. As an industry leader in Full-Stack Technology Services, Talent Services, and real-world application, we work with progressive leaders to drive change. That's the power of true partnership. TEKsystems is an Allegis Group company.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

About TEKsystems and TEKsystems Global Services

We're a leading provider of business and technology services. We accelerate business transformation for our customers. Our expertise in strategy, design, execution and operations unlocks business value through a range of solutions. We're a team of 80,000 strong, working with over 6,000 customers, including 80% of the Fortune 500 across North America, Europe and Asia, who partner with us for our scale, full-stack capabilities and speed. We're strategic thinkers, hands-on collaborators, helping customers capitalize on change and master the momentum of technology. We're building tomorrow by delivering business outcomes and making positive impacts in our global communities. TEKsystems and TEKsystems Global Services are Allegis Group companies. Learn more at TEKsystems.com.

The company is an equal opportunity employer and will consider all applications without regard to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.