Principal Software Engineer
eClinical Solutions
Mansfield, MA · $152k–$190k a year · Posted September 21, 2026
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Engineering jobs in the rankings
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
Pay compared with the market
This listing pays about $171,000 a year. Across 109 open principal software engineer listings that state pay, the middle half runs $210,500 to $320,000 and the median is $275,000. That is 38% below the median, below the middle half of those listings.
Listed pay is what employers advertise, not what people are paid.
Principal Software Engineer salaries by state · Check your own pay
How AI is used in this kind of work
Among software developers, AI is already used for some of the tasks. Measured exposure for software developers: 29% (some).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
Skills this job asks for
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About the job
About eClinical Solutions
eClinical Solutions is transforming clinical development with elluminate®, our Clinical Data Cloud , helping life sciences organizations unify, analyze, and unlock the value of their data faster than ever before. By combining a modern cloud platform with expert data services, we empower smarter decisions across the clinical trial lifecycle—accelerating innovation that ultimately improves patient outcomes.
Our engineering teams build enterprise-grade, revenue-generating products at the intersection of cloud, data, analytics, and emerging AI technologies . If you’re excited about building sophisticated software that makes a real-world impact on healthcare, this is the place to do it.
You will make an impact:
As a Principal Full Stack Software Engineer , you will be a technical leader within the elluminate Product Development team. You’ll help design and build the core services and user experiences of a next-generation clinical data and analytics platform—while influencing architecture, engineering standards, and technical direction.
This role is ideal for an experienced engineer who enjoys hands-on development , mentoring others, and bringing modern capabilities—including AI-assisted and agentic workflows—into production-grade systems .
Your day to day:
Design, develop, test, and deploy scalable, secure, and highly interactive web applications
Own and evolve core platform modules , from concept through release and support
Influence application and system architecture with a focus on performance, reliability, security, and maintainability
Lead by example through clean, well-tested code , thoughtful design reviews, and pragmatic technical decisions
Collaborate closely with Product Management, QA, and other engineers throughout the SDLC
Provide technical mentorship and guidance to other engineers on the team
Diagnoses and resolves complex production issues across distributed systems
Ensure solutions meet eClinical Solutions quality standards and applicable industry regulations
Contribute to technical documentation including design specs, acceptance criteria, and release notes
AI & Modern Engineering Focus
We’re actively incorporating AI-powered capabilities into our platform, and you’ll help shape how this is done responsibly and effectively in an enterprise environment. This includes:
Integrating LLMs and AI services into .NET- and Python-based systems
Designing and implementing AI-assisted workflows , copilots, or intelligent automation features
Working with agentic AI patterns (e.g., task orchestration, tool-using agents, workflow automation)
Applying prompt engineering, evaluation techniques, and guardrails to ensure reliability and compliance
Collaborating with data and platform teams to operationalize AI—not just prototype it
Deep ML expertise is not required —we’re looking for strong engineers who understand how to apply AI capabilities in real products .
Take the first step toward your dream career. Here is what we are looking for in this role.
Qualifications:
Bachelor’s or Master’s degree in Computer Science or equivalent practical experience
10+ years in software design and development using the Microsoft technology stack preferred
Expert-level proficiency in C#, .NET, and ASP.NET (MVC/Web APIs)
Strong experience building full-stack web applications (Angular, TypeScript, HTML, CSS)
Solid understanding of software design principles, patterns, and best practices
Experience across the full Software Development Lifecycle (Agile preferred)
Proven ability to work independently while collaborating effectively in a fast-paced environment
Excellent communication, documentation, and technical leadership skills
AI & Platform Experience
Hands-on experience integrating LLM-based services (e.g., OpenAI, Azure OpenAI, or similar) into applications
Experience using Python and/or .NET alongside AI/LLM workflows
Familiarity with agent-based or workflow-driven AI architectures is a strong plus
Understanding of secure and responsible AI usage in enterprise systems
Nice to Have
Strong SQL expertise (Microsoft SQL Server preferred), including performance tuning
Experience with microservices, distributed systems, and cloud platforms (AWS preferred)
Secure development experience, including awareness of common vulnerabilities and mitigations
Experience with clinical trial data, life sciences, or regulated SaaS environments
Experience building data visualizations or analytics-driven user experiences
AI Use Statement
Employees are expected to appropriately leverage company-approved AI tools to improve productivity and quality while adhering to company policies, protecting confidential information, validating AI-generated content, and exercising sound professional judgment. AI is intended to augment—not replace—professional judgment, critical thinking, accountability, and decision-making. Accountability for all work remains with the employee.
Accelerate your skills and career within a fast-growing company while impacting the future of healthcare. We have shared our story, now we look forward to learning yours!
eClinical is a winner of the 2025 Top Workplaces USA Award for Remote Work! We have also received numerous Top Workplaces Culture Excellence Awards celebrating our exceptional company vision, values, and work-life balance. See all the details here: https://topworkplaces.com/company/eclinical-solutions/
eClinical Solutions is a people first organization. Our inclusive culture values the contribution that diversity brings to our business. We celebrate individual experiences that connect us and that inspire innovation in our community. Our team seeks out opportunities to learn, grow and continuously improve. Bring your authentic self, you are welcome here!
We are proud to be an equal opportunity employer that values diversity. Our management team is committed to the principle that employment decisions are based on qualifications, merit, culture fit and business need.
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Pay Range
US Pay Ranges $152,000 — $190,000 USD