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# Full Stack Engineer

- **Company:** Sincere Corporation
- **Location:** United States
- **Experience:** Expert
- **Salary:** $120,000.0 - $140,000.0
- **Contract:** Permanent contract
- **Skills:** Amazon Web Services, Cloud Computing, DevOps, PostgreSQL, MongoDB, MySQL, Ruby on Rails, Redis, Mixpanel, Next.js, Software Engineering, Systems Architecture, TypeScript, Web Applications, Datadog, ReactJS, Containerization, Codebase, Terraform, Docker
- **Published:** September 4, 2026
- **Apply:** https://startup.jobs/senior-full-stack-engineer-sincere-corporation-8731502

## About the Role

* 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

## Description

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


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