Full Stack Developer (Platform & Backend Focus)

Opiniion Inc. • Lehi, UT

6h • Onsite

About The Position

As a Full-Stack Developer at Opiniion, you'll help build and improve the products our customers use every day, working across the stack to ship features, improve reliability, and support a fast-moving product and engineering team. This seat leans toward the core platform and backend. We're migrating from MongoDB to PostgreSQL across a complex Node.js application, and we need someone who can own that work: design the schema, execute a safe migration, and help the team write better application code on the other side. You'll go deep on backend and data while still contributing across front-end and back-end product work as priorities shift. AI is part of how we build. We expect engineers to use AI tools thoughtfully in their daily development to move faster and ship better work, while keeping sound engineering judgment. Claude is our primary AI platform.

Requirements

• 5+ years of professional software engineering experience.
• True full-stack range: comfortable on the front end (JavaScript or TypeScript with a modern framework, Vue preferred, React welcome) and on the back end (services and APIs in Node.js and/or Python).
• Strong SQL and solid relational data fundamentals (joins, CTEs, window functions, indexing).
• Experience designing and consuming REST APIs, including auth flows (OAuth, API keys, token refresh), pagination, rate limiting, and error handling.
• Comfortable in AWS (RDS, S3, ECS or Lambda, IAM basics) and using Docker for local development.
• Disciplined with Git, pull requests, CI/CD, testing, and clear documentation.
• Have shipped a production NoSQL to relational migration and can walk us through it.
• Deep PostgreSQL knowledge (JSONB, CTEs, window functions, transactions, EXPLAIN ANALYZE).
• Strong, autonomous Node.js and TypeScript skills, with a habit of putting data integrity first and speed second.
• Ownership mindset: you treat what you ship as your responsibility, not just your code. When something breaks, you care about the fix and the prevention.
• Strong communicator: you set clear expectations, surface problems early, and write things down so the team doesn't run on tribal knowledge.
• Collaborative and low-ego: you give thoughtful code reviews, help teammates through blockers, and keep learning.
• Autonomous: you can take a well-scoped problem and drive it to done, while knowing when to ask for help.

Nice To Haves

• Experience with schema migration tooling (we use Drizzle).
• Strong computer science fundamentals and prior backend architecture ownership.
• Experience in SaaS or other product-led software environments.
• Familiarity with MongoDB internals and NoSQL-to-relational migration patterns.

Responsibilities

• Write and maintain Node.js (TypeScript) API services and Python scripts.
• Architect the relational schema from our existing document-based data model.
• Design and execute a zero-downtime migration strategy (dual-write, expand-contract, and similar patterns).
• Own database performance: indexing, query analysis, and connection pooling.
• Work across MongoDB and PostgreSQL to read, process, and optimize data.
• Contribute across the full stack, from front-end product work to back-end services, as the team's priorities move.

Benefits

• Comprehensive healthcare plans, encompassing medical, dental, and vision insurance, along with group life coverage. Opiniion covers 40-90% of the premium cost for employees and all dependents.
• 401(k) retirement plan with a 100% corporate match on the first 1% and 50% match on the next 5%.
• Pre-tax Health Spending Accounts (HSA).
• Paid Parental Leave for all new parents (including adoption or foster care).
• Unlimited Time Off policies.
• 10 Paid Holidays annually.
• Monthly Gym Reimbursement benefit.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed