Senior Backend Engineer – RNG Trading & Carbon Reporting

Apex Systems; Houston, Northern (TX, KY); Hybrid; USD 110,000 - 190,000; Full time

Benefits offered by this job

Medical

Dental

Vision

Life Insurance

Disability Insurance

ESPP

401K with match

HSA

EAP

Discounts

Training access

Certification discounts

Job summary

Apex Systems is seeking a Senior Backend Developer in Houston to join an onsite team working on RNG trading, carbon credit calculations, and regulatory reporting for LCFS and RFS programs.

You will develop enterprise .NET applications, design RESTful APIs, implement authentication with Azure AD, and use PostgreSQL with EF Core. The role emphasizes architecture, testing, and DevOps with Docker/OpenShift and real-time SignalR features.

Qualifications

• 5+ years of experience with .NET development (C#, ASP.NET Core).
• Experience with Entity Framework Core and PostgreSQL.
• Proficiency in RESTful API design and OpenAPI/Swagger documentation.
• Experience with authentication systems (OAuth2, JWT, Azure AD).
• Knowledge of containerization (Docker) and Kubernetes/OpenShift.
• Experience with background job processing and scheduled tasks.
• Understanding of SOLID principles and clean architecture.
• Experience with unit testing (xUnit, FluentAssertions) and integration testing.
• Knowledge of CI/CD pipelines and DevOps practices (ADO).

Responsibilities

• Develop and maintain enterprise-scale .NET applications using ASP.NET Core 9.0 and C#.
• Design and implement RESTful APIs for biogas trading, inventory management, and regulatory reporting.
• Build business logic for RINS credit calculations, LCFS compliance, and carbon credit trading.
• Work with PostgreSQL databases and Entity Framework Core for data persistence.
• Implement authentication and authorization using Azure Active Directory and Microsoft Identity Platform.
• Develop email workflow systems and automated reporting for regulatory compliance.
• Create scheduled background jobs using Quartz.NET for data processing and calculations.
• Integrate with Microsoft Graph API for SharePoint document management via Azure MS Graph.
• Build real-time features using SignalR for live trading updates.
• Implement data validation using FluentValidation.
• Work with Docker and OpenShift for containerized deployments.

Skills

C# / .NET

ASP.NET Core

Entity Framework Core

PostgreSQL

RESTful APIs

OAuth2 / JWT

Azure AD

Docker

Kubernetes/OpenShift

Unit testing

CI/CD

Clean Architecture

Tools

Swagger/OpenAPI

OpenShift

Azure Graph API

Job description

Apex Systems is seeking a Senior Backend Developer in Houston to join an onsite team working on RNG trading, carbon credit calculations, and regulatory reporting for LCFS and RFS programs.

You will develop enterprise .NET applications, design RESTful APIs, implement authentication with Azure AD, and use PostgreSQL with EF Core. The role emphasizes architecture, testing, and DevOps with Docker/OpenShift and real-time SignalR features.