Senior Backend Engineer (Remote)

Freterium; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Freterium is seeking an experienced backend engineer to own backend work for a logistics operations platform, shaping features through deployment and production monitoring. The role combines service development, database performance, reliability improvements, and close collaboration with product and design partners.

You will build production web services and REST APIs primarily with PHP and Symfony, write and tune MySQL queries, and improve reliability and performance while collaborating with

Qualifications

• Five+ years building and operating backend production systems.
• Strong PHP, Symfony, MySQL, Doctrine, and REST API experience.
• Knowledge of software design principles and patterns, focusing on maintainable, testable code.
• Clear written communication, including concise PRs, tickets, and design notes.

Responsibilities

• Scope, design, implement, test, ship, and monitor backend features end to end.
• Build production web services and REST APIs primarily with PHP and Symfony.
• Write and tune MySQL queries, indexes, and Doctrine ORM usage.
• Improve system reliability and performance through design, profiling, and instrumentation.
• Collaborate with product and design to translate requirements into features, and contribute to engineering standards and developer experience.
• Use AI coding tools to assist with tests, migrations, refactoring, documentation, and internal automation; review outputs carefully.

Skills

Backend development

System design

Clear communication

Pragmatic trade-offs

Tools

PHP

Symfony

MySQL

Doctrine ORM

REST API

Job description

**Role overview**

Own backend work for a logistics operations platform, from shaping features through deployment and production monitoring. The role combines service development, database performance, reliability improvements, and close collaboration with product and design partners.

**Responsibilities**

• Scope, design, implement, test, ship, and monitor backend features end to end.
• Build production web services and REST APIs primarily with PHP and Symfony.
• Write and tune MySQL queries, indexes, and Doctrine ORM usage.
• Improve system reliability and performance through design, profiling, and instrumentation.
• Work with product and design to turn requirements into practical features, and contribute to engineering standards and developer experience.
• Use AI coding tools to assist with tests, migrations, refactoring, documentation, and internal automation; review their output carefully.

**Requirements**

• At least five years of experience building and operating backend production systems.
• Strong PHP, Symfony, MySQL, Doctrine, and REST API experience.
• Knowledge of software design principles and patterns, with a focus on maintainable, testable code.
• Clear written communication, including concise pull requests, tickets, and design notes.
• Ability to debug across the stack and make pragmatic, evidence-informed trade-offs.
• Willingness to use AI coding tools regularly while taking responsibility for the resulting work.

**Nice to have**

• Experience with caching, queues, or asynchronous processing.
• Familiarity with metrics, tracing, logging, and performance tuning.
• Awareness of security and data privacy in SaaS products, or experience in logistics.