Staff Engineer, Full-Stack

Department: Tech

Location: Denver, CO

Employment Type: FullTime

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.

Additionally, we expect all team members to effectively leverage modern AI technologies as part of their everyday workflow, and to continuously adapt as new tools emerge. Familiarity with job-relevant AI platforms such as Gemini, ChatGPT, Claude, GitHub Copilot or other industry-standard AI productivity tools is expected and considered essential for success at this company.

About the Role

As a Staff Engineer, you’ll own end-to-end features across one or more of our backend services, agentic frameworks, AI Pipelines and front end. You’ll work under minimal supervision, troubleshoot complex problems, come up with innovative designs and optimizations and help shape our microservices architecture while collaborating closely with product, design, and QA. You will work with high performance, mission critical tools and services. You do not need to have experience training or developing ML models/algorithms, but experience with them is a plus.

What you’ll do

• Design, build, and maintain scalable Ruby/Rails, TypeScript/Node, and Python services and RESTful or gRPC APIs that integrate with agentic GenAI systems

• Optimize MongoDB and PostgreSQL queries and service performance

• Collaborate with cross-functional squads to define requirements and deliver features

• You will work on AI Agents, MCP servers and various other AI enabled tools and frameworks and so must be comfortable working with ambiguity and rapidly evolving technologies

• Identify and drive process, architecture, and toolchain improvements

• Mentor junior engineers (code reviews, pair-programming etc)

• Serve as a technical lead for complex projects, balancing scope, risk, and not compromising deliverable quality.

What does success look like?  

• 30 days: Ship a backend feature and demo it to the team

• 60 days: Potentially lead a cross-team API enhancement or propose a performance or scaling or testability improvement

• 90 days: Lead a system-level architectural improvement or completely new deliverable (e.g., introduce a TypeScript microservice or refactor a critical service for scalability), including a clear design, implementation, and rollout plan in place or executed against.

Who You Are

• 8+ years building web services or full-stack applications

• Strong hands-on experience in Ruby/Rails, TypeScript/Node, Python or similar backends

• Deep understanding of APIs, PostgreSQL, and some performance tuning

• Proven ability to balance short-term delivery with long-term technical investments and continuous improvement of quality.

• Comfortable working in a fast-paced, ambiguous environment where requirements evolve over time.

• Excellent problem-solving, communication, and collaboration skills

• Some knowledge of of AI/ML is desired but not a requirement

• Experience with LLMs or AI-driven toolchain (Langchain/Langgraph) is highly desirable

Our Benefits 

The anticipated salary range for this role is $160,000 - $180,000. Final compensation will be determined based on a variety of factors, including relevant experience, skills, education, and past performance. 

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 generous PTO policy, with a minimum of three weeks off per year

• A holiday schedule that follows standard U.S. holidays

• Free therapy coverage benefits to ensure employees have access to the care they need (must be enrolled in a qualifying medical plan to participate)

• Competitive Medical, Dental, and Vision coverage, with plans to meet every need — including HSA (with $1,100 company contribution) and FSA options

• Employer-paid short-term disability, long-term disability, life & AD&D, plus coverage of the salary difference for up to seven weeks of short-term disability leave (after the required waiting period)

• Eight weeks of paid Parental Leave; if the parent also qualifies for STD, this benefit is in addition, allowing for 8–16 weeks of paid leave

• 401(k) retirement plan with 100% match on up to 4% of base salary, immediately vested

• Join teammates from across the country at our annual company gathering

• Company shutdown between Christmas and New Year’s

• Supplemental life insurance, pet insurance, commuter benefits, and more

Application Deadline

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

Equal Opportunity 

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.