Senior Backend Engineer - Checkout
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Key skills for this role
About the Role
Salla is looking for a Senior Backend Engineer to design, build, and scale highly available backend systems for fintech, checkout, and promotions. Requires 6+ years of software engineering experience and strong distributed systems knowledge.
Key Skills for This Role
Responsibilities
- Design, build, and operate scalable backend services supporting Fintech, Checkout, Promotions, Loyalty, and Payment systems
- Develop clean, maintainable, and high performance production code
- Design and evolve RESTful APIs and integrations with internal platforms, payment gateways, and third party services
- Build reliable distributed systems capable of handling high traffic, failures, and asynchronous workloads
- Drive architectural decisions with scalability, resilience, maintainability, and operational excellence in mind
- Optimize application performance across services, databases, caching layers, queues, and background workers
- Participate in architecture discussions, technical design reviews, RFCs, and engineering planning
- Ensure services are production ready through monitoring, logging, alerting, testing, and observability best practices
- Write comprehensive unit and integration tests while maintaining high engineering standards through code reviews
- Leverage AI assisted engineering tools responsibly to accelerate development, debugging, testing, documentation, and code quality
- Mentor junior and mid level engineers through technical leadership, design discussions, and engineering best practices
- Contribute throughout the full software development lifecycle, from design through deployment and production support
Requirements
- 6+ years of professional software engineering experience building production backend systems
- Strong experience building scalable backend services in at least one modern language such as PHP, Go, Java, or C#
- Strong understanding of distributed systems fundamentals
- Experience designing and operating high scale, highly available backend systems
- Proven ability to write clean, maintainable, efficient, and high performance production code
- Strong understanding of software engineering principles including SOLID, design patterns, clean architecture, and domain driven design
- Experience designing RESTful APIs and integrating with third party platforms and payment providers
- Strong SQL knowledge with experience designing and optimizing MySQL or PostgreSQL databases
- Experience with caching technologies, queues, background workers, and performance optimization
- Experience writing automated tests, participating in code reviews, and working within modern CI/CD pipelines
Full Job Posting
Role Overview
- We are looking for a Senior Backend Engineer Checkout to join our engineering team focused on Fintech, Checkout, and Promotions.
- You will design, build, and scale highly available backend systems that power mission critical payment experiences, checkout flows, promotions, loyalty, pricing, and financial services.
- This role is ideal for engineers who enjoy solving complex distributed systems problems and building high performance services.
- You'll work closely with Product, Design, Data, and Engineering teams to deliver resilient, observable, and maintainable systems.
Responsibilities
- Design, build, and operate scalable backend services supporting Fintech, Checkout, Promotions, Loyalty, and Payment systems.
- Develop clean, maintainable, and high performance production code with readability and long term ownership in mind.
- Design and evolve RESTful APIs and integrations with internal platforms, payment gateways, and third party services.
- Build reliable distributed systems capable of handling high traffic, failures, and asynchronous workloads.
- Drive architectural decisions with scalability, resilience, maintainability, and operational excellence in mind.
- Optimize application performance across services, databases, caching layers, queues, and background workers.
- Participate in architecture discussions, technical design reviews, RFCs, and engineering planning.
- Ensure services are production ready through monitoring, logging, alerting, testing, and observability best practices.
- Write comprehensive unit and integration tests while maintaining high engineering standards through code reviews.
- Leverage AI assisted engineering tools responsibly to accelerate development, debugging, testing, documentation, and code quality.
- Mentor junior and mid level engineers through technical leadership, design discussions, and engineering best practices.
- Contribute throughout the full software development lifecycle, from design through deployment and production support.
Requirements
- 6+ years of professional software engineering experience building production backend systems.
- Strong experience building scalable backend services in at least one modern language such as PHP, Go, Java, or C#.
- Experience with PHP and Laravel is preferred but not required.
- Strong understanding of distributed systems fundamentals, including consistency, availability, concurrency, fault tolerance, idempotency, asynchronous processing, messaging, and caching.
- Experience designing and operating high scale, highly available backend systems.
- Proven ability to write clean, maintainable, efficient, and high performance production code.
- Strong understanding of software engineering principles, including SOLID, design patterns, clean architecture, and domain driven design concepts.
- Experience designing RESTful APIs and integrating with third party platforms and payment providers.
- Strong SQL knowledge with experience designing and optimizing MySQL or PostgreSQL databases.
- Experience with caching technologies, queues, background workers, and performance optimization.
- Experience writing automated tests, participating in code reviews, and working within modern CI/CD pipelines.
- Comfortable using AI assisted development tools to improve productivity, software design, implementation, testing, debugging, documentation, and code reviews.
Preferred Qualifications
- Experience building Fintech, Payments, Checkout, Loyalty, Pricing, Promotions, or other high volume transactional systems.
- Experience with event driven architectures and distributed messaging systems.
- Experience with Docker, Kubernetes, cloud platforms (AWS, GCP, or Azure), and Infrastructure as Code.
- Experience with observability platforms, distributed tracing, metrics, and production monitoring.
- Experience working within microservices or service oriented architectures.
- Bachelor's or Master's degree in Computer Science, Software Engineering, or a related field is a plus.
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