• Developing novel, parallel algorithms to accelerate core problems in data processing and power the next generation of data center workflows • Implementing solutions in C++ and CUDA • Contributing to open source projects, such as cuDF, Velox, Presto and Spark • Benchmarking, profiling, and optimizing code • Working closely with experts in GPU hardware, software and workflows

• Develop and maintain RESTful APIs using Python (FastAPI) • Work with data processing using Pandas and NumPy • Implement Machine Learning solutions using scikit-learn • Design and optimize databases (PostgreSQL or Azure SQL Database) • Build cloud applications using Azure services • Create modern, responsive interfaces with React.js and TypeScript • Manage application state with Redux or Context API • Contribute to building CI/CD pipelines in Azure DevOps • Integrate systems and automate workflows with Azure Functions and Logic Apps • Collaborate with multidisciplinary teams (data, product, design)

POSITION OVERVIEW: 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 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 OUR TECHNOLOGY STACK: - Vue.js, Node.js, AWS, Docker, and MongoDB (Soon changing to PostgreSQL) - GitHub, CircleCI OPINIION’S CULTURE: At Opiniion, we take our work seriously, but we don’t take ourselves too seriously! Our culture has been affectionately coined "Funfessional"—a perfect blend of professionalism and fun. We are committed to maintaining the highest standards of integrity, ethics, and excellence in all we do while fostering an environment where people enjoy coming to work. We believe in collaboration, innovation, and building a team that truly cares—about our clients, their residents, and each other. BENEFITS SNAPSHOT: - 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* Opiniion is an equal opportunity employer that is committed to diversity and inclusion in the workplace. We prohibit discrimination and harassment of any kind based on actual or perceived race, color, creed, religion, national origin, ancestry, citizenship status, age, sex or gender (including pregnancy, childbirth and pregnancy-related conditions), gender identity or expression (including transgender status), sexual orientation, marital status, military service and veteran status, physical or mental disability, genetic information, or any other characteristic protected by applicable federal, state or local laws and ordinances.

• Develop, evolve and support backend applications based on a microservices architecture, with a focus on high performance, scalability and software engineering best practices. • Develop and maintain backend applications in Java 11+. • Build and evolve microservices using Spring Boot 3.x. • Design and implement REST APIs following an API First approach (OpenAPI/Swagger). • Implement synchronous and asynchronous integrations (Feign Clients, JMS, etc.). • Model and implement business rules using JPA (Hibernate and Spring Data). • Ensure code quality with automated tests and code reviews. • Participate in agile ceremonies (daily stand-ups, planning, refinement). • Analyze issues, identify root causes and drive continuous improvements. • Collaborate with architecture, QA, infrastructure and business teams. • Support technical documentation of solutions and integrations.