[Hiring] Senior Backend Software Engineer @Opiniion Inc.

Role Description

Opiniion is seeking a backend software engineer with strong SQL and Node.js skills. We are migrating from MongoDB to PostgreSQL across a complex Node.js application. We need someone who can own this — not just run scripts, but design the schema, execute a safe migration, and guide us to write better application code on the other side. We also need someone who has experience writing fast, secure, and clean APIs and application code in Node.js. The absolute floor for experience is 5 years.

Responsibilities

• Write and maintain Node.js API services
• Architect the relational schema from our existing document-based data model
• Design and execute a zero-downtime migration strategy (dual-write, expand-contract, etc.)
• Own DB performance — indexing, query analysis, connection pooling
• Work with Node.js to read, process, and optimize MongoDB and SQL
• Work inside Docker locally and on AWS

Qualifications

• Have shipped a production NoSQL → relational migration, and can walk us through it
• Have a strong background in backend software engineering, and understand relevant computer science fundamentals
• Know PostgreSQL deeply (JSONB, CTEs, window functions, transactions, EXPLAIN ANALYZE)
• Are competent and autonomous at writing Node.js code
• Have used schema migration tooling
• Are comfortable in AWS (RDS, ECS, IAM, VPC basics)
• Think about data integrity first, speed second
• Are willing to use AI in your daily development work

Requirements

• You’re NOT the right person if:
• Haven’t worked in Node.js before
• Can’t write raw SQL — we’re not hiding behind abstractions here
• Can’t explain database migrations and other core concepts
• Need hand-holding on Docker, AWS, or advanced SQL
• Are opposed to using AI in your daily development work

Technical Skills

• Proficiency in Node.js — building APIs and service-layer code
• Deep PostgreSQL knowledge
• Experience with MongoDB and NoSQL-to-relational migration patterns
• Docker for local development environments
• AWS fundamentals: RDS, ECS, IAM, VPC

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.
• *Note that the above benefits are available only to full-time employees of Opiniion*