Who We Are Celebrating 40+ years! Theradex Oncology is a full-service CRO specializing in oncology. The company manages global oncology trials and programs. The company was founded in 1982 working with the National Cancer Institute, which led to its expansion to working with industry sponsors developing cancer therapeutics. As a service-based company we support both domestic and international sponsors in the conduct of both early and late phase trials. What You'll Do As part of Theradex Oncology, you will have the opportunity to work with one of the largest professional teams focused solely on the development of cancer therapies. Cancer research continues to evolve as new therapies and therapeutic approaches are discovered, as part of the team you will work to support our sponsors in the development of these therapies. Theradex Oncology is an environment for highly motivated individuals who want to make a difference. Opportunity Senior Full Stack Engineer - Contract Location: Princeton NJ and Remote – Preference given to applicants residing on the East Coast. We are seeing a Contract Senior Full Stack Engineer to design, build, and deliver modern, production-grade applications across the full technology stack. This role is hands-on and execution-focused, with responsibility for solution quality, performance, and usability. The position includes providing technical direction, guidance, and mentorship to mid-level and junior developers. Responsibilities will include: - Design, develop, and maintain end-to-end full stack solutions, including frontend, backend services, APIs, and data integrations - Build modern, responsive, and intuitive user interfaces, working closely with UX and product partners - Define and implement scalable, secure, and maintainable technical solutions for production environments - Translate product and business requirements into clear, well-structured technical designs - Provide ongoing technical guidance, code reviews, and implementation support to mid-level and junior developers - Promote and enforce best practices for coding standards, testing, CI/CD, and deployment - Take ownership of complex features and workflows from design through production release - Ensure application performance, reliability, security, and operational stability - Collaborate closely with product managers, designers, and stakeholders throughout the delivery lifecycle - Contribute to technical documentation, knowledge sharing, and continuous improvement initiatives . What You Need - Bachelor's degree required, Advanced degree preferred - 4–6 years of professional software development experience in full stack roles - Experience with end-to-end project to include gathering requirements, UX, production and deployment - 2+ years experience with .Net Core & C# - Strong experience with modern frontend frameworks (e.g., React, Angular, or Vue) - Solid backend development experience - Experience designing and consuming RESTful APIs - Working knowledge of relational and/or NoSQL databases - Experience building, deploying, and supporting production-grade applications - Familiarity with cloud platforms (AWS, Azure) and CI/CD pipelines - Strong understanding of software engineering fundamentals, testing strategies, and version control - Able to work effectively as a remote worker. - Possibility of occasional domestic travel for face-to-face meetings or training. Advanced notice will be provided. - Skills and Competencies - Agile/Scrum methodologies and sprint planning in a team environment - Experience with secure coding, performance optimization, observability (logging, metrics and tracing) in production systems - Proven track record owning technical decisions and deliver outcomes for a project or product area. - Extensive experience as a full stack developer, including delivering at least one complex system from concept to production - Strong analytical and organizational skills with the ability to prioritize tasks and track assignments to meet the needs of internal and external clients. - The ability to convery or share ideas in a concise terms that others understand. - Works to establish and maintain positive working relationships while offering added value and insight. - Guides others to strengthen their knowledge, skills, and abilities to accomplish goals. - Must have strong communication skills and be fluent in English. At Theradex we offer a supportive culture that puts people first. The annual base salary for this position ranges from $135,000-170,000. The actual salary offer will be based on a number of factors, including but not limited to the candidate’s qualifications, experience, skills, and competencies for the role. This is a contract position and not eligible for relocation or company provided sponsorship. Theradex is an Equal Opportunity Employer.