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Syndicode

Senior Backend Engineer

Remote Senior $4.7k–$12.8k/moest.

Summary

Syndicode is a value-driven software development partner seeking a Senior Backend Engineer for a mature, multi-tenant B2B hiring marketplace platform. You'll own backend development and feature delivery on a lean team using Rails 7.2 and React, with expertise in AI-native engineering workflows.

What you'll do

  • Own backend development and code quality across a multi-tenant Rails 7.2 application
  • Identify and resolve performance bottlenecks including N+1 queries, slow endpoints, Elasticsearch tuning, and caching strategy
  • Develop multi-tenant features with strict data isolation across enterprise clients
  • Monitor application health using New Relic, Cloudflare, and Rollbar, and lead incident resolution
  • Build and maintain API endpoints integrated with a React frontend
  • Work within a multi-agent development workflow where AI agents handle requirements intake, code generation, and code review

Requirements

  • 5+ years with Ruby on Rails; experience with Rails 7.x
  • React: comfortable with frontend integration and component work
  • PostgreSQL: query optimisation, indexing, performance profiling
  • Caching strategies: HTTP caching, Redis, application-level caching
  • Technical leadership: architectural decisions, code reviews, mentoring
  • Experience working with AI coding agents beyond autocomplete, including multi-agent frameworks and orchestration tools
  • Ability to critically review, guide, and override AI-generated code
  • Terminal-first workflow: comfortable with CLI tools and scripting
  • Systems thinking: understand how changes affect multiple tenants and services
  • English: Upper-Intermediate or above

Nice to have:

  • Elasticsearch query tuning and search optimisation
  • Redis
  • Kubernetes and containerisation
  • Multi-tenant system design experience
  • Python
  • Familiarity with context limits and token economy in LLM-assisted workflows
  • Multi-agent orchestration experience

Conditions

  • 15 days of vacation per year
  • 11 days off for holidays
  • 20 sick leave days per year
  • Fully remote job
  • Internal tech meetups
  • Continuous feedback within teams and departments
  • Self-management: opportunity to manage your time and plan your activities
  • Ability to participate in decision-making and bring new ideas
  • Dynamic, fast-growing environment with quick adaptation to market changes

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