Full Stack C# Developer

Hive + Co

Hive + Co

Software Engineering
Westerville, OH, USA
Posted on Dec 19, 2025
We are seeking a Full-Stack C# Developer with expertise in Windows Forms (WinForms) client-server applications, Angular web forms, and secure API development. The ideal candidate will have experience developing C# APIs that interact with MS SQL Server, implementing FIPS 140-2 encryption for data security, and working with Windows Services. Additionally, the candidate should be proficient in SFTP, machine-to-machine communications via email formatting, and other secure communication protocols.

Key Responsibilities:
  • Windows Forms & Client-Server Development:
    • Design, develop, and maintain Windows Forms (WinForms) client-server applications in C#.
    • Optimize stored procedures and database interactions in MS SQL Server.
    • Develop and maintain Windows Services for background processing and automation.
  • Web & API Development:
    • Develop and maintain Angular web forms with a C# API backend.
    • Build secure, scalable APIs using ASP.NET Core/Web API.
    • Ensure API communication and database storage comply with FIPS 140-2 encryption standards.
  • Secure Communications & Data Exchange:
    • Implement secure file transfers using SFTP and other encryption protocols.
    • Develop machine-to-machine (M2M) communication using email-based data exchange and formatting.
    • Ensure secure authentication and authorization using best practices, including OAuth, JWT, and multi-factor authentication (MFA).
  • Performance, Security & Compliance:
    • Ensure database encryption, API security, and secure data storage comply with FIPS 140-2.
    • Optimize database queries and stored procedures for scalability and performance.
    • Monitor and troubleshoot system performance, network communications, and data integrity.

Required Skills & Qualifications:
  • Development & Frameworks:
    • Strong experience in C# and .NET Framework/.NET Core.
    • Windows Forms (WinForms) development expertise.
    • Proficiency in Angular (version 10+ preferred) for web application development.
    • Experience developing RESTful APIs using ASP.NET Core/Web API.
    • Strong understanding of MS SQL Server, stored procedures, and database performance tuning.
  • Security & Compliance:
    • Hands-on experience implementing FIPS 140-2 encryption for data storage and transmission.
    • Experience with SSL/TLS encryption, secure authentication (OAuth, JWT, SAML), and access control best practices.
    • Knowledge of cybersecurity principles, secure coding practices, and vulnerability management.
  • Windows Services & Communications:
    • Experience developing and maintaining Windows Services.
    • Familiarity with SFTP, SMTP, POP3, and other machine-to-machine (M2M) communication protocols.
    • Understanding of networking, firewalls, and secure data transmission.

Additional Technical Skills:
  • Experience with DevOps, CI/CD pipelines, and automated deployments.
  • Familiarity with cloud platforms (Azure, AWS) for hybrid applications.
  • Knowledge of message queuing systems (RabbitMQ, MSMQ, or Kafka).
  • Version control using Git (GitHub, GitLab, or Bitbucket).
  • Bachelor's degree in Computer Science, Software Engineering, or a related field (or equivalent experience).
  • 3+ years of experience in C# Windows Forms and SQL development.
  • 2+ years of experience with Angular and API development.

Preferred Skills:
  • Experience with Blazor or WPF for modern UI development.
  • Knowledge of containerization (Docker, Kubernetes).
  • Familiarity with PKI (Public Key Infrastructure) and digital certificates.
  • Experience implementing FIPS 140-2 encryption is highly preferred.

Reference: 1045560

Worried that you don’t meet every single requirement listed in the job ad? Studies have shown that individuals from marginalized groups are less likely to apply to jobs unless they meet every single qualification. Hive + Co. is dedicated to building a diverse, inclusive and representative workplace, so if you’re excited about this role, but worried that you don’t meet every requirement, we encourage you to apply anyways. We’d love to get to know you.