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.
- 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.
You are:- 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
BenefitsWhat We Offer: - 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)
PLEASE NOTE: Our team is primarily based in Greater Boston. We will consider applicants who reside anywhere within a 2 hour drive of the city. While this role is remote, we have occasional in-person meetings at the office (every 4-6 weeks typically).
The base salary range for this role is $110,000 - $130,000. Actual salary may vary based on skills and experience.
