Freelance Java Developer C2C Jobs in Ohio (NOW HIRING)

Job Title: Principal Engineer Location: North Cincinnati, Ohio Type: Direct Hire Compensation: $150k + Contractor Work Model: Hybrid – onsite Tue, Wed, and Thr. Local Candidates, No C2C or Sponsorship

Responsibilities

• Serve as the primary technical authority for the Client Technology platform, defining how our flagship products interact with partner integrations, internal core services, and downstream data consumers.
• Drive technical roadmap planning in partnership with product and leadership, translating business objectives into architectural direction across both the application and data platform.
• Maintain a high level of individual contribution within the customer-facing application team.
• Write production code, perform deep-dive code reviews across the integration layer (core service interop, partner APIs, message queue consumers, etc.), and guide the team through complex technical problems.
• Provide non-management technical leadership to Senior Software Developers and Data Engineers.
• Elevate the technical bar across the application and data teams through shared standards, architectural reviews, and mentorship on design principles.
• Collaborate with business analysts, subject matter experts, and other team members to design new applications and perform modifications to current applications.

• Minimum ten years of progressive experience as a practitioner in software development and data management, preferably with at least three years operating at a principal level.
• Comprehensive and demonstrable full-stack software development skills and experience utilizing modern and open-source technologies to build enterprise business applications.
• Knowledge of and practical experience with modern data architecture: Medallion model, CDC-based data capture, bronze/silver/gold layer design, and SCD Type 2 patterns.
• Experience developing and managing enterprise-level B2B data sharing, API strategy, and high-volume data ingestion/egress.
• Must be comfortable working in and managing multiple system environments (Linux & Windows), including Docker-based development workflows and production deployment pipelines.
• Proven ability to influence technical direction across multiple teams (Data, Application Support, Product) without formal people-management authority.
• Track record of leading technical design sessions, producing architecture documentation, and guiding developers through design trade-offs in complex, multi-schema enterprise systems.
• Experience establishing or contributing to engineering standards, code review practices, and development workflows across multiple teams.
• Must be comfortable navigating a polyglot environment that includes Java interop, multiple integration protocols (REST, message queues, serverless), multiple databases and data platforms including Oracle, MySQL, Microsoft SQL Server, Microsoft Fabric, Snowflake, AWS, and various integration partners and systems.
• Excellent oral and written communication skills. Able to communicate effectively with a diverse group of individuals with varying levels of technical understanding and varying skillsets.
• Ability to work collaboratively with other application development and data engineering areas to define standards and manage change.

System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. We help clients get work done more efficiently and economically, without compromising quality. System One not only serves as a valued partner for our clients, but we offer eligible employees health and welfare benefits coverage options including medical, dental, vision, spending accounts, life insurance, voluntary plans, as well as participation in a 401(k) plan.

System One is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, age, national origin, disability, family care or medical leave status, genetic information, veteran status, marital status, or any other characteristic protected by applicable federal, state, or local law.

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