Senior Multi-Tenant .NET Backend & Integration Engineer

Apex Systems; Jersey City (NJ); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401(k) plan

ESPP

HSA

EAP

Job summary

Everforth Apex is seeking a Senior Multi-Tenant .NET Backend & Integration Engineer to build a high-performance SaaS backend in Jersey City, NJ. The role focuses on C#, .NET Core APIs interfacing with DynamoDB and PostgreSQL, plus cross-team collaboration on infrastructure and security.

You will drive architectural guidance, implement tenant isolation, and troubleshoot multi-system data flows, while coordinating with DevOps and networking peers for reliable, secure connectivity.

Qualifications

• 5+ years of hands-on backend development experience in distributed systems on AWS.
• Expert-level C#, .NET Core and APIs communicating with DynamoDB and PostgreSQL.
• Experience with EF Core or Dapper and data access layers across external sources.
• Knowledge of VPCs, PrivateLink, firewalls and cloud networking guidance.

Responsibilities

• Design, code, and optimize multi-tenant APIs using C# and .NET Core for data across DynamoDB, PostgreSQL, and external sources.
• Provide architectural requirements to DevOps and Network Engineering for infrastructure needs.
• Collaborate with network and infrastructure teams to validate secure backend connections to external data centers.
• Diagnose and debug end-to-end data routing between AWS-hosted API and remote databases.

Skills

Backend development

C#

.NET Core

DynamoDB

PostgreSQL

EF Core

Dapper

AWS

Terraform

AWS CDK

Tenant isolation

Data partitioning

Tools

DynamoDB

PostgreSQL

EF Core

Dapper

Terraform

AWS CDK

Job description

Senior Multi-Tenant .NET Backend & Integration Engineer

Location: Jersey City, New Jersey (Onsite)

Role Overview

This is a hands‑on backend engineering role for a developer who will build and deploy a multi‑tenant SaaS application on AWS. You will write high-performance APIs using C# and .NET that communicate with DynamoDB, PostgreSQL, and various external client data sources. You will collaborate with DevOps and Network Engineers to guide infrastructure setup, test hybrid connectivity, and troubleshoot cross-network data access issues.

to work remote on a 12 month contract.

Key Responsibilities

• Design, code, and optimize secure multi‑tenant APIs using C# and .NET Core that dynamically query and aggregate data across Amazon DynamoDB, PostgreSQL, and varied external client data sources.
• Provide clear architectural requirements to DevOps and Network Engineering teams regarding application infrastructure needs.
• Collaborate with network and infrastructure peers to validate secure backend connections to external client data centers.
• Diagnose, isolate, and debug end‑to‑end data routing issues between the AWS‑hosted API and remote external databases.

Required Qualifications

• Experience: 5+ years of active, hands‑on backend development building distributed systems on AWS.
• Technical Skills:Expert‑level C#, .NET CoreDeep hands‑on experience with Amazon DynamoDB, PostgreSQL (Entity Framework Core or Dapper), and writing abstract data access layers to query heterogeneous external data sources.Real‑world experience implementing application‑level tenant isolation, data partitioning, and tenant context middleware.Solid conceptual understanding of VPCs, AWS PrivateLink, and firewalls to effectively guide networking peers.Basic familiarity with cloud infrastructure deployment (Terraform, AWS CDK) to streamline pipeline integrations.
• Communication: Strong collaborative skills to translate complex application data requirements into actionable tasks for infrastructure teams.

Everforth Apex is a world‑class IT services company that serves thousands of clients across the globe. When you join Everforth Apex, you become part of a team that values innovation, collaboration, and continuous learning. We offer quality career resources, training, certifications, development opportunities, and a comprehensive benefits package. Our commitment to excellence is reflected in many awards, including ClearlyRateds Best of Staffing® in Talent Satisfaction in the United States and Great Place to Work® in the United Kingdom and Mexico.

Benefits

• Everforth Apex offers a range of supplemental benefits, including medical, dental, vision, life, disability, and other insurance plans that offer an optional layer of financial protection.
• We offer an ESPP (employee stock purchase program) and a 401K program which allows you to contribute typically within 30 days of starting, with a company match after 12 months of tenure.
• Everforth Apex also offers a HSA (Health Savings Account on the HDHP plan).
• a SupportLinc Employee Assistance Program (EAP) with up to 8 free counseling sessions.
• a corporate discount savings program and other discounts.
• In terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA.
• Everforth Apex has a dedicated customer service team for our Consultants that can address questions around benefits and other resources, as well as a certified Career Coach.
• You can access a full list of our benefits, programs, support teams and resources within our ‘Welcome Packet’ as well, which an Everforth Apex team member can provide.

Equal Opportunity

Everforth Apex Systems is an equal opportunity employer. We do not discriminate or allow discrimination on the basis of race, color, religion, creed, sex (including pregnancy, childbirth, breastfeeding, or related medical conditions), age, sexual orientation, gender identity, national origin, ancestry, citizenship, genetic information, registered domestic partner status, marital status, disability, status as a crime victim, protected veteran status, political affiliation, union membership, or any other characteristic protected by law. Everforth Apex will consider qualified applicants with criminal histories in a manner consistent with the requirements of applicable law.

If you require an accommodation under the Americans with Disabilities Act to participate in an interview with a virtual recruiter or to use our website for a search or application, please contact our Benefits Department at [e-mail] or 804-523-8228. Please note that this contact information is strictly to be used for medical ADA accommodations and that no other inquiries will be answered.

UnitedHealthcare creates and publishes the Transparency in Coverage Machine-Readable Files on behalf of Everforth Apex Systems.