Senior .NET Backend & Data Engineer (Hybrid—Boston)

Colossus Technologies Group; Boston (MA); Hybrid; USD 120,000 - 170,000; Full time

Benefits offered by this job

Hybrid work option

Job summary

Colossus Technologies Group in Boston, MA, seeks a Senior Software Developer to build backend services, APIs, and data-processing pipelines using C#/.NET and SQL Server. You’ll contribute to scalable data solutions in a collaborative, Agile environment.

Focus areas include optimizing relational data models, troubleshooting production issues, and guiding best practices while partnering with product and engineering stakeholders to deliver reliable, high‑quality software.

Qualifications

• 5+ years of professional software development experience.
• Strong hands-on experience with C#, .NET / .NET Core, and object-oriented programming.
• Strong SQL Server experience, including complex queries, stored procedures, query tuning, indexing, and performance optimization.
• Experience developing REST APIs and integrating with internal or third‑party systems.
• Solid understanding of relational database design, normalization, and data integrity.
• Experience with Entity Framework, Dapper, or similar ORM/data‑access tools.
• Familiarity with Git‑based source control and CI/CD practices.
• Strong troubleshooting, communication, and collaboration skills.

Responsibilities

• Design, develop, test, and maintain backend applications using C# and the .NET framework / .NET Core.
• Build and support RESTful APIs, services, integrations, and data-processing workflows.
• Write, optimize, and troubleshoot complex SQL Server queries, stored procedures, functions, and database objects.
• Design and improve relational data models, schemas, and database performance.
• Investigate production issues, diagnose root causes, and deliver durable fixes.
• Participate in code reviews and contribute to engineering standards, documentation, and best practices.
• Collaborate with cross-functional teams in an Agile delivery environment.
• Help modernize legacy applications and improve reliability, scalability, and maintainability.

Skills

C# & .NET

SQL Server

REST APIs

Object-oriented programming

Agile development

Git

Tools

Entity Framework

Dapper

CI/CD

Git

Job description

Colossus Technologies Group in Boston, MA, seeks a Senior Software Developer to build backend services, APIs, and data-processing pipelines using C#/.NET and SQL Server. You’ll contribute to scalable data solutions in a collaborative, Agile environment.

Focus areas include optimizing relational data models, troubleshooting production issues, and guiding best practices while partnering with product and engineering stakeholders to deliver reliable, high‑quality software.