Remote Senior Full-Stack Engineer for AI-Driven SaaS

Simulations Plus; United States; Hybrid; USD 90,000 - 110,000; Full time

Benefits offered by this job

Fully remote work

Flexible schedules

Annual bonus

Health coverage

Job summary

Simulations Plus is seeking a Senior Full-Stack Engineer to join a lean, high-velocity team delivering web/SaaS and AI-powered features. You will ship back-end, front-end, and LLM-integrated surfaces across a small department with a strong emphasis on practical AI integration and robust data flows.

The role focuses on building scalable APIs, UI and data wiring, and collaborating with an AI lead to embed intelligent capabilities into our platform.

Qualifications

• 3+ years of professional software engineering experience with shipped full-stack work
• Experience with document or NoSQL databases such as MongoDB
• Comfort building and consuming REST APIs and JSON contracts
• Genuine interest in agents, MCP, and applied AI and the drive to build real expertise
• Fluency using AI coding tools (Claude, Cursor, Copilot) in daily workflow

Responsibilities

• Feature Delivery Across the Stack
• Own features end-to-end across Node.js/Express backends and React/Tailwind frontends
• Build the APIs, UI, and data flows behind real customer-facing functionality
• Contribute to data, auth, and service patterns the platform builds on
• AI Feature Integration and integrate LLM-powered functionality into product surfaces
• Wire frontends to LLM and MCP endpoints; handle streaming, errors, and degraded states
• Contribute to evals, fixtures, and tooling that support the AI side of the team
• Bring full-stack range to a team that values flexibility across backend, frontend, and AI
• Contribute to code reviews, documentation, and team engineering practices
• Apply AI coding tools in daily engineering workflow

Skills

Full-stack development

REST APIs

AI tooling

MongoDB

AI coding tools

Education

Bachelor's degree in CS or related

Tools

AWS

CI/CD

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Full Time Professional US 1 Attachments

30+ days ago Requisition ID: 1090

Salary Range: $85,000.00 To $110,000.00 Annually

Simulations Plus stands as a global leader in model-informed and AI-accelerated drug development. We create value for our clients by accelerating the discovery, development, and commercialization of pharmaceuticals and other products through innovative science-based software and consulting solutions.

Leadership truly cares about maintaining a positive culture and employee well-being. We offer fully remote work, flexible schedules, and generous vacation policy along with affordable health coverage, annual bonus, and more! Check out how much our employees love working here: https://www.comparably.com/companies/simulations-plus .

The Senior Full-Stack Engineer is a versatile contributor, part of a small department whose charter spans both web/SaaS and AI/agents products. The role will ship features across the full stack — backend, frontend, and LLM-integrated surfaces — wherever the team's most pressing implementation work lands in a given cycle. It's a high-variety role for an engineer who wants to build real depth across web platform and applied-AI engineering, on a deliberately lean team that's growing quickly and intentionally.

Department:Product and Technology

Internal Grade:10

Direct Reports:No

Status: Exempt

Location:Remote

Job Responsibilities:

• Feature Delivery Across the Stack
  • Own features end-to-end across Node.js and Express backends and React/Tailwind frontends
  • Build the APIs, UI, and data flows behind real customer-facing functionality
  • Contribute to the data, auth, and service patterns the platform builds on
• AI Feature Integration
  • Integrate LLM-powered functionality into product surfaces, working alongside the team's AI lead
  • Wire frontends to LLM and MCP endpoints; handle streaming, errors, and degraded states gracefully
  • Contribute to evals, fixtures, and tooling that support the AI side of the team
• Team Impact
  • Bring full-stack range to a team that values flexibility across backend, frontend, and AI
  • Contribute to code reviews, documentation, and the team's shared engineering practices
  • Apply AI coding tools effectively as part of daily engineering workflow
• Other Duties as Assigned

Required Qualifications:

• 3+ years of professional software engineering experience, with shipped full-stack work in production
• Practical experience with document or NoSQL databases such as MongoDB
• Comfort building and consuming REST APIs and JSON contracts
• Genuine interest in agents, MCP, and applied AI, and the drive to build real expertise in those areas
• Fluency using AI coding tools (Claude, Cursor, Copilot) in daily workflow

Preferred Qualifications:

• Familiarity with Anthropic, OpenAI, or other LLM provider SDKs
• Exposure to MCP, agent frameworks, or LLM-integrated product features
• Experience with cloud infrastructure (AWS preferred) and CI/CD pipelines
• Experience in regulated-software environments (SOC 2, HIPAA, GxP, 21 CFR Part 11) or life-sciences SaaS
• Familiarity with Passport, OAuth, OIDC, or comparable auth patterns

Education:

• Bachelor's degree in computer science, engineering, or related field preferred
• Relevant technical certifications welcomed