Senior Backend Engineer

b_labs is the transformation and digitization arm of B.TECH, on a mission to change the industry as we know it. We spearhead tech innovation at B.TECH, an organization that has been a cornerstone of the Egyptian retail industry. We are the engine powering B.TECH in achieving its goal of becoming the leading omni-channel platform for consumer electronics and appliances in Egypt. By joining b labs, you will get to benefit from a collaborative startup environment, while also enjoying the stability of working within a company that has achieved strong growth year after year. You will be part of a visionary, customer-focused team with an ambitious mission--to become a trailblazer for digital retail within the Middle East. About the role We're hiring a Senior Backend Java Developer who takes ownership of their work end-to-end, from writing the code to solving problems when they come up in production, and who's independent, curious, and quick to figure things out. Responsibilities: Own features from business requirement clarification through design, implementation, testing, deployment, monitoring, and support. Translate business needs into technical solutions with clear trade-offs around quality, scalability, cost, and delivery speed. Design and develop Java-based backend services, APIs, and business logic for complex order management workflows. Design and troubleshoot asynchronous flows, synchronous APIs, Error handling, and reconciliation. Monitor application health, logs, performance, and operational metrics. Participate in on-call rotations and support production stability with a strong operational mindset. Act as a reliable team member who can independently deliver work and unblock delivery. Use AI tools to accelerate development, testing, and troubleshooting. Learn unfamiliar systems quickly, especially enterprise platforms like IBM Sterling OMS. Work with both modern and legacy stacks Requirements Production Ownership – On-call experience, debugged live issues, end-to-end feature ownership, postmortems Java Backend (3+ yrs) – OOP, design patterns, concurrency, Spring Boot/Spring Framework REST APIs & Integration – Production-grade APIs, third-party integrations, versioning, error handling AWS Serverless & Architecture – Lambda, API Gateway, DynamoDB, SQS/SNS, EventBridge, S3; understand cold starts, cost optimization, failure modes, high-availability patterns, serverless design tradeoffs Database & SQL – Query optimization, transactions, migrations, schema design, RDS optimization Observability & Troubleshooting – Logging, metrics, tracing, cross-system debugging, SLO/SLI, CloudWatch Angular Frontend (2+ yrs) – Components, services, routing, TypeScript Event-Driven – IBM MQ, RabbitMQ, Kafka, event sourcing, CQRS, async architectures Testing & Code Quality – Unit tests, integration tests, TDD, clean code Learning Agility – Learn Enterprise app in Full-Stack Delivery – Own features end-to-end: design → code → test →…