Senior .NET Software Engineer

Please respond to these questions on the top of your resume to be considered for the role:
1a. Are you currently located in and will you be working in the USA for the entirety of this assignment? (Yes or no)
2a. How many years of Software Engineering Experience do you have?
2b. How many years of .NET experience do you have?
2c. How many years of software architectural experience do you have?
3a. Do you feel you meet a majority of the requirements put forth in this job description? (Yes or no)

Job Title- Senior Software Engineer / Principal Architect
Location- Remote
Type- Contract-to-Hire
Duration- June 1, 2026 – December 31, 2026 (conversion to permanent anticipated)

Overview
This role provides hands-on technical leadership for the modernization and evolution of a mature, data-intensive healthcare analytics product into a scalable, extensible platform. The initial focus will be on incrementally modernizing a large legacy system by moving complex business logic and high-volume processing out of the database layer and into modern application and platform-based components. As the platform evolves, this role will contribute broadly to architecture, scalability, integration, and long-term technical direction.
This is a highly technical, strategic role requiring deep experience with large-scale systems, modernization initiatives, and regulated environments, while remaining hands-on with design and development.

Responsibilities
* Lead the incremental modernization of a large, database-centric system by extracting business logic and computational processing into application- and platform-level components using modern languages and frameworks
* Design architectures that treat the database primarily as durable storage and efficient data access, while complex rules, detection logic, enrichment, and aggregation are handled outside the database
* Define processing strategies suited to batch, micro-batch, and near real-time workloads based on scale and data volume
* Establish and evolve a modern, vendor-neutral target architecture emphasizing open-source technologies and scalable design patterns
* Design solutions capable of processing hundreds of millions of records across multi-tenant environments with strong focus on performance, scalability, data isolation, and cost efficiency
* Define migration strategies that support parallel execution, validation, and safe, incremental cutover without disrupting production systems
* Support platform expansion through integration of new data sources, modular services, APIs, and authentication/authorization capabilities
* Establish architectural standards for data ingestion, processing pipelines, service boundaries, and API design
* Ensure systems meet expectations for scalability, observability, reliability, and auditability within regulated healthcare environments
* Remain hands-on with architecture and development while mentoring engineers and influencing technical direction across teams

Required Skills & Experience
* 5-7+ years of professional software engineering experience
* Prior experience working within the healthcare industry
* Proven experience modernizing legacy, data-intensive systems operating at scale
* Demonstrated success decoupling business logic from relational databases and re-implementing it at the application or platform level
* Strong proficiency in C#/.NET or comparable modern, multi-paradigm programming languages
* Deep expertise with SQL and relational databases, including performance tuning and architectural decision-making
* Experience designing systems that process large-scale, multi-tenant data using batch or near real-time processing approaches
* Experience executing incremental modernization strategies for production systems
* Background supporting systems evolving from single products into extensible platforms with multiple integrations and consumers
* Strong communication skills and ability to collaborate with both technical and non-technical stakeholders

Tools & Technologies
* C# / .NET (or equivalent modern application frameworks)
* Relational databases (e.g., Oracle or similar)
* SQL
* Distributed and scalable processing architectures
* API and service-oriented design patterns

Education
* Bachelor’s degree in Computer Science, Engineering, or a related field (or equivalent practical experience)
* Advanced degree is a plus, but not required