C#/.NET Middleware Engineer - Philadelphia

Only for registered members Philadelphia, United States

3 hours ago

Default job background
This is not a web development role. · Seeking a software engineer who operates comfortably in the middleware layer — building high-throughput gateway logic that connects enterprise platforms to physical devices in real time. · If Async/Await, Task Parallel Library, threading, and ...
Job description
This is not a web development role.


Seeking a software engineer who operates comfortably in the middleware layer — building high-throughput gateway logic that connects enterprise platforms to physical devices in real time.

If Async/Await, Task Parallel Library, threading, and socket-level communication are second nature to you, this is the focus.

What You'll Be Building


  • Transactional gateway services handling high message volume
  • Middleware that bridges enterprise software and POS hardware
  • Concurrent, multi-threaded services running in production environments
  • Direct device-level integrations via TCP/IP sockets
  • Secure transaction processing logic
This is systems-focused C# engineering — not front-end, not REST-heavy business app development.

Technical Requirements (Non-Negotiable)


  • Advanced C# and .NET experience through current)
  • Strong hands-on use of Async/Await and TPL in production systems
  • Experience building multi-threaded, high-throughput transactional software
  • TCP/IP socket programming experience
  • 5–9 years professional development experience

Helpful background:
FinTech, Gaming, Healthcare tech, or other high-availability environments.
Working knowledge of SQL/SQLite and network protocols (HTTP/HTTPS, SSL) expected.

Location & Work Model
Hybrid role


Must reside within:

  • 75 miles of Philadelphia, PA
or

  • 50 miles of Las Vegas, NV
Permanent U.S. work authorization required. No H1B/OPT/CPT sponsorship


Work Authorization:
Applicants must have valid, independent authorization to work in the United States. This position does not offer, support, or accept any form of sponsorship—whether employer, third-party, future, contingent, transfer, or otherwise. Candidates must be able to work for any employer in the U.S. without current or future sponsorship of any kind. Work authorization will be verified, and misrepresentation will result in immediate removal from consideration.


Similar jobs

  • Work in company

    Middleware Test Engineer

    Only for registered members

    Middleware Test Engineer with experience in Middleware platform and Agile required for Full Time - Permanent position in Philadelphia. · 5+ year of experience in Middleware platform such as API automation, · Telecom Domain experience , · , · , · ,, ...

    Philadelphia

    2 weeks ago

  • Work in company

    Middleware Deployment Engineer

    Only for registered members

    +The Middleware Deployment Engineer is responsible for the administration and maintenance of our middleware deployment environment. · +Must have technical support experience in Web/Java/C++/Linux type applications · Scripting and/or development background is a must have: develops ...

    Philadelphia, PA

    1 week ago

  • Work in company

    Software Engineer- Middleware

    Only for registered members

    We are currently seeking a top tier Software Engineer with specific experience in the Microsoft technology stack (.Net, C#, SQL) with a focus on our middleware products and interacting with hardware devices.This is a full-time salaried position. · You will join a team of world cl ...

    Philadelphia

    1 month ago

  • Work in company

    Software Engineer- Middleware

    Only for registered members

    We are currently seeking a top tier Software Engineer with specific experience in the Microsoft technology stack (.Net, C#, SQL) with a focus on our middleware products and interacting with hardware devices. · ...

    Philadelphia

    1 week ago

  • Work in company

    Middleware Software Engineer

    Only for registered members

    Joining our team means engaging in a supportive and collaborative environment where stability and growth are priorities. · Develop and maintain software applications focused on payment solutions · Collaborate with team members to tackle complex technical challenges · ...

    Philadelphia

    3 days ago

  • Work in company

    Middleware Engineer

    Only for registered members

    Preferably 8-10 years of experience in working in production and pre-production support or management required. · Candidate must demonstrate ability to work collaboratively be able to provide direction and assistance with diagnostics and troubleshooting using critical problem sol ...

    Upper Providence Township

    2 weeks ago

  • Work in company

    Middleware Engineer

    Only for registered members

    We are looking for an experienced Middleware Engineer to maintain and enhance our enterprise middleware platform. · 10+ years in middleware engineering or related fields. · Strong expertise in middleware technologies: MQ, Java, APIs, Apigee. · ...

    Newtown Square, PA

    3 weeks ago

  • Work in company

    Middleware Engineer

    Only for registered members

    We are seeking a Middleware Engineer to join our Infrastructure organization. · You will play a crucial role in designing, implementing, and maintaining the middleware infrastructure (ESB, SOA, Messaging and API Management) that enables seamless communication and integration betw ...

    Chadds Ford

    2 weeks ago

  • Work in company

    Middleware Engineer

    Only for registered members

    We are looking for an experienced Middleware Engineer to maintain and enhance our enterprise middleware platform. · Maintain and engineer enterprise middleware platforms. · Provide production support. · ...

    Newtown Square

    3 weeks ago

  • Work in company

    Node React Middleware Software Engineer IIII

    Only for registered members

    We are looking for a Middle Tier software developer to be a critical component within in our agile delivery process for Software Development. · About the team this team builds evidence-based oncology pathways — structured treatment recommendations for cancer care based on the lat ...

    Philadelphia

    2 days ago

  • Work in company

    Senior Middleware Engineer

    Only for registered members

    We are seeking a Middleware Engineer to join our Infrastructure organization. · You will play a crucial role in designing, implementing and maintaining the middleware infrastructure (ESB SOA Messaging and API Management) that enables seamless communication and integration betwee ...

    Chadds Ford

    2 weeks ago

  • Work in company

    Middleware Staff Engineer

    Only for registered members

    The Staff Engineer is a senior individual contributor and technical leader responsible for leading deep complex and/or high-risk technical projects. · This role supports the organization by providing context and technical direction defining technical specifications developing reu ...

    Wilmington

    1 week ago

  • Work in company

    Middleware Staff Engineer

    Only for registered members

    The Staff Engineer is a senior individual contributor and technical leader responsible for leading deep complex and/or high-risk technical projects. · This role supports the organization by providing context and technical direction defining technical specifications developing reu ...

    Wilmington

    1 week ago

  • Work in company

    Lead Middleware Engineer – Oracle SOA

    Only for registered members

    We are one of the fastest-growing companies in the U.S. and this may be your opportunity to join us. · ...

    Bala-Cynwyd

    2 weeks ago

  • Work in company

    Middleware Staff Engineer

    Only for registered members

    The Staff Engineer is a senior individual contributor and technical leader responsible for leading deep complex and/or high-risk technical projects. This role supports the organization by providing context and technical direction defining technical specifications developing reusa ...

    Wilmington, DE

    5 days ago

  • Work in company

    Middleware Staff Engineer

    Only for registered members

    The Staff Engineer is a senior individual contributor and technical leader responsible for leading deep complex high-risk technical projects providing context and technical direction defining technical specifications developing reusable technical patterns automating manual proces ...

    Wilmington, DE

    1 week ago

  • Work in company

    Infrastructure Middleware Engineer Senior

    Only for registered members

    The Infrastructure Middleware Engineer Senior will be a team player in a technology organization responsible for ACFC's Middleware Infrastructure environment. · Manage Middleware products/environments including new installations, upgrades, maintenance and tuning, monitoring and c ...

    Newtown Square

    1 month ago

  • Work in company

    Senior Data Analyst

    Only for registered members

    + Data Integration & Middleware Architect who combines strong data analysis and data mapping expertise with the ability to design scalable middleware and integration architectures. · + Analyze source system data structures and business rules across multiple platforms · Create an ...

    Philadelphia

    2 weeks ago

  • Work in company

    Senior Data Analyst

    Only for registered members

    Data Integration & Middleware Architect who combines strong data analysis and data mapping expertise with the ability to design scalable middleware and integration architectures. · This role sits at the intersection of business, data, and engineering. · Ability to translate compl ...

    Philadelphia

    2 weeks ago

  • Work in company

    Senior Data Analyst

    Only for registered members

    Data Integration & Middleware Architect who combines strong data analysis and data mapping expertise with the ability to design scalable middleware and integration architectures. This role sits at the intersection of business, data, and engineering. · Analyze source system data s ...

    Philadelphia

    2 weeks ago