Senior .NET Application Architect

ASSYST, Inc.; Tallahassee (FL); On-site; USD 120,000 - 180,000; Full time

Job summary

ASSYST is seeking a Senior .NET Application Architect to lead the technical remediation and architecture of the Comptroller Automation Platform in Tallahassee, FL onsite. The role focuses on modernizing and aligning over 1,500 interfaces, applications, databases, and reporting systems, guiding legacy-to-.NET migrations, and driving architecture decisions.

The candidate will enforce coding standards, improve security, and provide technical guidance across the .NET ecosystem while mentoring teams

Qualifications

• Advanced to expert-level knowledge in the Microsoft .NET ecosystem.
• RESTful Web APIs experience.
• SQL Server data design and performance tuning.
• Experience with Azure DevOps, CI/CD and cloud services.

Responsibilities

• Architect end-to-end .NET solutions and document ADRs.
• Lead legacy-to-.NET migrations and evaluate new tech stacks.
• Perform fit-gap analyses and align critical financial processes.
• Enforce SOLID principles and review PRs; fix security issues with SonarQube.
• Support CI/CD pipelines and integrate Azure services.
• Mentor development teams and maintain technical documentation.

Skills

Architectural design

System modernization

RESTful APIs

Entity Framework

Front-end frameworks

Azure DevOps

Security remediation

SOLID principles

Mentoring

DDD

Clean Architecture

Event-Driven Architecture

Azure services

ERP knowledge

SCRUM

Education

Bachelor’s or Master’s degree in CS/IS

Tools

None

Job description

ASSYST is seeking a Senior .NET Application Architect to lead the technical remediation and architecture of the Comptroller Automation Platform in Tallahassee, FL (Onsite)

The Senior .NET Application Architect will guide the modernization and alignment of over 1,500 computing assets interfaces, enterprise applications, databases, and reporting systems and lead legacy-to-modern architecture transitions, perform fit-gap analyses, ensure code quality via SonarQube, resolve security vulnerabilities, replace legacy UI frameworks (AngularJS/Kendo UI) with modern alternatives, and provide technical guidance across the agency’s .NET ecosystem.

Key Responsibilities

• Architectural Strategy & Design: Architect end-to-end .NET solutions, set design standards, define system patterns, and document Architecture Decision Records (ADRs).
• System Modernization & Migration: Lead legacy-to-.NET migrations (e.g., JCL/COBOL/FOCUS), evaluate new tech stacks, and remediate technical debt without business disruption.
• Financial Alignment: Perform fit-gap analyses, re-engineer incoming/outgoing interfaces, and align critical financial processes (payroll, journal vouchering)
• Code Quality & Technical Governance: Enforce SOLID principles, review pull requests, and address security vulnerabilities using SonarQube.
• DevOps & Cloud Integration: Support CI/CD pipelines (Azure DevOps, GitHub Actions) and integrate Azure services (Key Vault, App Insights, Blob Storage).
• Leadership & Knowledge Sharing: Mentor development teams, collaborate with lead developers on high‑risk technical changes, and maintain technical documentation.

Qualifications & Skill Requirements

• Minimum of 7 plus years in multiple IT domains.
• 3 plus years of dedicated technical/solution architecture experience.
• Advanced to expert-level knowledge in application systems design, integration patterns, and the Microsoft .NET ecosystem.
• Web APIs (RESTful Services)
• Entity Framework / Modern ORM Frameworks
• Modern Front-End Frameworks (Angular, React, or Vue)
• Key Knowledge, Skills, and Abilities (KSAs)
• Technical KSAs
• Domain-Driven Design (DDD), Clean Architecture, Event-Driven Architecture, RESTful API Design, and Integration Patterns.
• SQL Server, Relational Database Design, Data Access Optimization, ERDs, Performance Tuning, Scalability, and Fault Tolerance.
• Azure DevOps, Application Insights, Key Vault, Blob Storage, CI/CD Strategies, and Observability/Logging tooling.
• Knowledge of Enterprise Resource Planning (ERP) frameworks, financial accounting processes, or state-level financial systems.
• Applied working knowledge of the SCRUM framework.
• Superior ability to translate complex technical concepts for business stakeholders and articulate business requirements to technical teams.
• Analytical mindset capable of performing independent root‑cause analysis and making sound, data‑driven decisions.
• Track record of mentoring team members, managing stakeholder expectations, building consensus, and adapting leadership styles to diverse project teams.
• Adaptability to evolving state mandates and project constraints while maintaining a high standard of customer service to agency end‑users.
• Bachelor’s or Master’s degree in Computer Science, Information Systems, Data Science, Software Engineering, or a related field.

ASSYST is an Equal Opportunity Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, age, disability, military status, national origin or any other characteristic protected under federal, state, or applicable local law

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self‑identification survey.Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiringprocess or thereafter. Any information that you do provide will be recorded and maintained in aconfidential file.

As set forth in ASSYST, Inc.’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection.As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measurethe effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categoriesis as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service‑connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.