12Go

Senior Backend Developer, PHP

12Go

contract

Posted on:

Location Type: Remote

Location: Remote • 🇵🇱 Poland

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Job Level

Senior

Tech Stack

Distributed SystemsMicroservicesPHPRust

About the role

  • -Designing and maintaining scalable backend services (not strict microservices, but service-oriented);
  • -Optimising performance in search and checkout flows under high concurrency;
  • -Writing robust automated tests (unit, functional, contract);
  • -Supporting production codebase that includes legacy components.

Requirements

  • -5+ years of backend engineering, with at least 3 years in PHP;
  • -Proven experience with high-load systems (performance tuning, caching strategies, DB optimisation);
  • -Solid algorithmic thinking and ability to evaluate trade-offs between architecture elegance and delivery speed;
  • -Familiarity with distributed systems concepts;
  • -Proactive problem-solver: able to research, propose, and drive solutions;
  • -Balance between independence and collaboration — knows when to follow instructions and when to challenge them;
  • -Comfortable asking questions early to avoid misunderstandings;
  • -Fluent English.
  • Nice to have:
  • -Hands-on Rust experience (systems or backend modules);
  • -Background with geospatial data or ML-driven services;
  • -Degree in Computer Science / Software Engineering;
  • -Previous e-commerce or fintech experience.
Benefits
  • -Engaging work on a product that enables millions of travelers to book their trips daily;
  • -Full-time remote working - 5 days week, 8 hours per day;
  • -Development opportunities (budget for self-paced learning, global training workshops, online English language classes, e-learning platforms);
  • -Internal growth and internal mobility opportunities;
  • -Competitive annual leave, sick leave, and public holidays;
  • -Annual company offsite in Thailand.

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
PHPbackend engineeringperformance tuningcaching strategiesdatabase optimisationautomated testingRustalgorithmic thinkingdistributed systemsgeospatial data
Soft skills
proactive problem-solverindependencecollaborationcommunicationability to evaluate trade-offsasking questionsdelivery speedresearch skillssolution-drivenadaptability
Certifications
Degree in Computer ScienceDegree in Software Engineering
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