Backend Developers

Backend Developers

Usage-Based Payments & Billing Backend Software Engineer — Hybrid, Warsaw, Poland

Build correctness-critical cloud billing, metering and payment backend services.

Vacancy details

This is a private vacancy. Company details stay confidential until InVault confirms a serious candidate fit.

Status
Active
Date posted
2026-11-15
Open until
2027-02-13
Employment type
Full-time
Source-listed languages
English
Language requirement
Required
Work arrangement
Hybrid
Physical workplaces
Warsaw, Poland
Applicant eligibility
Applicant geography not specified

Overview

Own billing, payment and metering backend infrastructure for a usage-based cloud platform. Build reliable workflows spanning invoices, customer card management and cloud marketplace purchases, collaborating with product, finance and customer teams to maintain correctness, reconciliation and auditability.

Requirements

  • Strong professional software engineering experience owning and operating distributed production services.
  • Backend proficiency with Go or a comparable systems language, with willingness to adapt to Go.
  • Practical experience with at least one public cloud platform such as AWS, Azure or Google Cloud.
  • Familiarity maintaining customer-facing web interfaces using React, TypeScript or comparable modern frontend tools.
  • Production experience using AI-assisted software development tools and workflows responsibly.
  • Strong written and spoken English and effectiveness collaborating across distributed teams.
  • Ability to design reliable billing, metering and payment workflows with idempotency, reconciliation, auditability, security and privacy controls.
  • Experience managing incidents or contributing to on-call support after ramp-up.
  • Cloud marketplace integrations, deeper React/TypeScript, authentication flows, Stripe, Metronome, SaaS platforms and streaming systems are advantages, not mandatory.

Responsibilities

  • Own reliable usage-based billing, metering, invoicing and credit-card payment services.
  • Develop and maintain software integrating payment processors and billing platforms.
  • Take over existing systems and design a sustainable engineering roadmap.
  • Ensure idempotent transaction processing, reconciliation, audit evidence and customer data protection.
  • Collaborate with finance, product and customer-success stakeholders on billing correctness.
  • Support customer-facing account workflows and marketplace integrations where needed.
  • Maintain operating reliability and participate in production support or on-call after onboarding.

Conditions

  • Full-time hybrid position in Warsaw, Poland, with at least three office days weekly.