Senior Full Stack Engineer
About The Position
Sincere is looking for a Senior Full Stack Engineer to help us make our products meaningfully better. This is a high-ownership individual contributor role for a seasoned engineer who can take a broad product area, understand the customer and business needs, and ship high-quality improvements. You will build full-stack features across Ruby on Rails and Next.js, own product initiatives end-to-end, from identifying opportunities and shaping solutions through implementation, launch, and iteration. You will partner with product/project managers and designers to identify customer pain points, uncover product opportunities, and deliver meaningful improvements. You will use tools like Claude Code and Codex as a core part of your workflow to explore, develop, test, and ship. You will make practical technical decisions that balance speed, quality, maintainability, performance, and customer impact. You will build polished, reliable, easy-to-use experiences with strong attention to UX. You will use tools like Datadog and Mixpanel to monitor production behavior, investigate issues, and inform product decisions. You will champion new ideas and continuously look for ways to improve our products, engineering practices, and customer experience.
Requirements
- A seasoned full-stack engineer with 7+ years of professional software development experience
- Comfortable working across our stack, including Ruby on Rails, TypeScript, React, Next.js, MySQL/Postgres, Redis, MongoDB, Sidekiq, OpenSearch, AWS, and Docker
- Fluent with AI-assisted development tools such as Claude Code or Codex
- Proven at building and maintaining large-scale customer-facing web applications
- Product-minded, with strong instincts for customer needs, UX quality, business value, and technical tradeoffs
- A self-starter who brings structure to loosely defined problems and drives them through execution
- A strong partner to DevOps, with enough understanding of system architecture, cloud infrastructure (AWS), deployment, containerization, and infrastructure-as-code (Terraform) to collaborate effectively
- Skilled at working in mature codebases, understanding existing architecture, and improving systems pragmatically
- Detail-oriented, with high standards for both the code and the customer experience
- Entrepreneurial, curious, and biased toward building, experimenting, and shipping
- Collaborative and low-ego, with strong communication skills and pride in your craft
Responsibilities
- Build full-stack features across Ruby on Rails and Next.js
- Own product initiatives end-to-end, from identifying opportunities and shaping solutions through implementation, launch, and iteration.
- Partner with product/project managers and designers to identify customer pain points, uncover product opportunities, and deliver meaningful improvements.
- Use tools like Claude Code and Codex as a core part of your workflow to explore, develop, test, and ship
- Make practical technical decisions that balance speed, quality, maintainability, performance, and customer impact
- Build polished, reliable, easy-to-use experiences with strong attention to UX
- Use tools like Datadog and Mixpanel to monitor production behavior, investigate issues, and inform product decisions
- Champion new ideas and continuously look for ways to improve our products, engineering practices, and customer experience.
Benefits
- 100% Health, Dental & Vision coverage
- 401K Plan with Profit Share
- Annual bonus potential
- Health & Wellness stipends
- Paid time off plus 12 paid holidays & Summer Fridays
- Paid parental leave
- Childcare benefits (dependent care FSA)
- Flexible, hybrid work environment
- In-person, all-expenses-paid Team Summits (2X a year)
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What This Job Offers
Job Type
Full-time
Career Level
Senior
Education Level
No Education Listed
