backend developer for billing systems

Nexcess provides specialty cloud solutions for organizations that need performance and compliance to coexist. It serves businesses worldwide, from agencies scaling client sites to enterprises running mission-critical operations.

• Own backend features end to end within the Experience Services domain
• Take work from specification through implementation, testing, deployment, monitoring, and ongoing production support across cart, checkout, order, billing, and authentication systems
• Design and develop reliable backend services and integrations
• Build and maintain application logic, APIs, workflows, and supporting services that power customer transactions across Managed Hosting and Managed Applications
• Build and maintain billing and invoicing functionality, including transaction flows, billing logic, invoice generation, and related integrations
• Design, query, and maintain relational database-backed functionality, focusing on correctness, performance, and reliability
• Translate business and product requirements into technical specifications; identify dependencies, failure scenarios, edge cases, and unknowns, and resolve ambiguity before implementation
• Use AI-assisted engineering tools in daily implementation and review, critically validating generated code and taking responsibility for the final result
• Write tests with every change, validate failure scenarios and happy paths, and provide evidence that changes are production-ready
• Review other engineers’ code and technical changes; identify design, maintainability, security, and reliability risks and provide actionable feedback
• Work safely in existing and unfamiliar codebases, make incremental improvements, and leave code better tested and documented
• Participate in the on-call rotation, respond to incidents, contribute to root-cause analysis, and complete follow-up actions
• Mentor other engineers, share technical knowledge, explain design decisions, and support less experienced engineers through implementation and review
• Identify cross-team dependencies early and coordinate with relevant engineers to avoid delivery blockers
• Understand the customer and business value of the work, ask questions before building the wrong solution, and communicate delivery risks and timelines early with evidence

• 5+ Years of experience in backend software engineering and production systems
• 5+ Years of experience with Perl or PHP
• 5+ Years of experience with relational databases such as PostgreSQL or MariaDB
• 5+ Years of experience with billing and invoicing systems
• Strong understanding of backend architecture, application logic, APIs, and data-driven systems
• Experience building and supporting transaction-heavy systems such as cart, checkout, ordering, billing, or authentication platforms
• Strong SQL skills and experience with relational data models
• Experience writing automated tests and validating production changes before deployment
• Ability to understand unfamiliar code and troubleshoot issues across multiple parts of a production system
• Experience participating in an on-call rotation and responding to production incidents
• Hands-on experience with AI-assisted engineering tools in day-to-day development
• Clear written communication skills and ability to work effectively in a distributed team across multiple time zones
• Будет плюсом: payment, billing, invoicing, or financial system integrations; authentication or identity-related systems; complex customer transaction and order lifecycle workflows; managed hosting, cloud platforms, SaaS, or other high-availability service environments; complex or legacy backend systems; mentoring engineers and reviewing backend design and code

• Pay range: 4,000 - 5,000 EUR per month (SDC Slovakia); 5,000 - 6,000 EUR per month (SDC Cyprus)