Senior Engineer, Full-Stack

About SonderMind

At SonderMind, we believe everyone deserves one personalized, connected, and effective mental health destination to take care of their mental health and well-being at any stage of life. SonderMind care encompasses everything from therapy and medication management to meditation and mindfulness exercises. Our clinicians leverage our digital tools and research to deliver increasingly high-quality care and to develop thriving practices. Combining technology and human connection, SonderMind drives better outcomes through our comprehensive approach. Learn more about SonderMind at sondermind.com or download the mobile app, available on iOS and Android. To follow the latest SonderMind news, get to know our clients, and learn about what it’s like to work at SonderMind, you can follow us on Instagram, Linkedin, and Twitter.

As a Senior Engineer, you'll develop and deliver end-to-end features across our backend services (Ruby on Rails or TypeScript/Node) and our Angular/TypeScript front end within our Revenue Cycle Management (RCM) platform. You'll contribute to AI-powered functionality including building intelligent agents with LangChain and LangGraph, implementing evaluation systems, and supporting prompt engineering initiatives that help streamline revenue operations processes. Working with increasing independence under the guidance of staff engineers, you'll solve complex technical challenges and contribute to the evolution of our core monolith and emerging TS microservices. You'll collaborate effectively with product, design, and QA teams while growing your expertise in AI agent development and learning to build systems that reduce manual burden on our support teams.

• Design, build, and maintain scalable Rails or TypeScript/Node services and RESTful APIs
• Implement and extend Angular/TypeScript UI components for web experiences, including AI-powered interfaces
• Develop AI agents, evaluation frameworks, and implement prompt engineering solutions
• Optimize PostgreSQL queries and service performance
• Collaborate with cross-functional squads to define requirements and deliver features
• Contribute to process, architecture, and toolchain improvements
• Mentor junior engineers through code reviews and pair-programming
• Take technical ownership of moderately complex projects, ensuring quality and timely delivery

• 30 days: Ship a backend feature (Rails or TS) end-to-end and demo it to the team, incorporating basic AI functionality or supporting AI agent integration
• 60 days: Lead a cross-team API enhancement that supports AI workflows and contribute to an AI evaluation framework or prompt optimization initiative
• 90 days: Lead a system-level improvement (e.g., introduce a TypeScript microservice that enables AI agent functionality or refactor a critical service to support LangChain/LangGraph integration), including a clear design, implementation, and rollout plan in place or executed against

• 5+ years building web services or full-stack applications
• Strong hands-on experience in Ruby on Rails or TypeScript/Node or Python back ends
• Solid Angular/TypeScript front-end skills
• Deep understanding of REST, PostgreSQL, and performance tuning
• Proven ability to balance short-term delivery with long-term technical investments.
• Comfortable operating in a fast-paced, ambiguous environment where requirements evolve.
• Excellent problem-solving, communication, and collaboration skills
• Nice-to-have: Experience integrating LLMs or AI-driven features

The anticipated salary range for this role is $140,000-$160,000 per year. Final compensation will be determined based on a variety of factors, including relevant experience, skills, education, and past performance. In addition to base salary, this position may also be eligible for a variable bonus and equity.

As leaders in redesigning behavioral health, we walk the walk with our employees' benefits. We want the experience of working at SonderMind to accelerate people’s careers and enrich their lives, so we focus on meeting SonderMinders wherever they are and supporting them in all facets of their lives and work.

Our benefits include:

• A commitment to fostering flexible hybrid work
• A generous PTO policy with a minimum of three weeks off per year
• Free therapy coverage benefits to ensure our employees have access to the care they need (must be enrolled in our medical plans to participate)
• Competitive Medical, Dental, and Vision coverage with plans to meet every need, including HSA ($1,100 company contribution) and FSA options
• Employer-paid short-term, long-term disability, life & AD&D to cover life's unexpected events. Not only that, we also cover the difference in salary for up to seven (7) weeks of short-term disability leave (after the required waiting period) should you need to use it.
• Eight weeks of paid Parental Leave (if the parent also qualifies for STD, this benefit is in addition, which allows between 8-16 weeks of paid leave)
• 401K retirement plan with 100% matching which immediately vests on up to 4% of base salary
• Travel to Denver 1x a year for annual Shift gathering
• Fourteen (14) company holidays
• Company Shutdown between Christmas and New Years
• Supplemental life insurance, pet insurance coverage, commuter benefits and more!

This position will be an ongoing recruitment process and will be open until filled.

SonderMind does not discriminate in employment opportunities or practices based on race, color, creed, sex, gender, gender identity or expression, pregnancy, childbirth or related medical conditions, religion, veteran and military status, marital status, registered domestic partner status, age, national origin or ancestry, physical or mental disability, medical condition (including genetic information or characteristics), sexual orientation, or any other characteristic protected by applicable federal, state, or local laws.