Senior Backend Engineer

Sabika is an Egyptian fintech platform that enables users to save, buy, and sell gold andsilver through a fully digital mobile experience.

Correctness, traceability, and security arecore to everything we build.We are hiring a Senior Backend Engineer to take full technical ownership of Sabika's backendplatform.

This is a high-trust, high-autonomy role: you will be the primary owner of theservices behind pricing, orders, wallets, and transactions, and you will be directlyaccountable for their correctness, security, and uptime.What you will do:- Own the Sabika Node.js backend end to end — architecture, development, code quality, deployment, monitoring, and incident response.- Design and build secure, high-integrity APIs powering our mobile applications, with strong guarantees around pricing accuracy and transaction consistency.- Set and maintain a high security baseline across the platform: authentication and authorization, input validation, secure data handling, encryption, rate limiting, and audit logging of sensitive operations.- Build and maintain integrations with third-party providers and external APIs.- Establish and enforce engineering standards: code review, automated testing, CI/CD, environment management, and technical documentation.- Own observability — logging, alerting, and performance monitoring — and continuously improve latency and reliability across critical flows.- Report directly to the CTO and translate product and technical requirements into reliable, well-architected systems.- Set the technical direction as the platform scales, and mentor engineers as the team grows.Why this role matters:You are not joining to work through a backlog.

You are taking ownership of a productionplatform serving real customers, with a clear mandate to make it stronger, safer, and faster.

Required:- Bachelor's degree in Computer Science (or Computer Engineering).- Minimum 5 years of hands-on backend engineering experience, including clear ownership of production systems.- Deep expertise in Node.js and its ecosystem: Express.js or NestJS, npm, and modern JavaScript (ES2020+).

Strong TypeScript experience is expected.- Solid understanding of Node.js internals and their practical implications: the event loop, async patterns, memory management, worker threads, clustering, and how to avoid blocking operations in high-throughput flows.- Strong command of relational databases (PostgreSQL/MySQL): schema design, indexing, transactions, isolation levels, and query optimization.

Practical experience with an ORM or query builder (Prisma, TypeORM, Sequelize, Knex) plus the ability to write and tune raw SQL.- Proven experience designing and building secure REST APIs consumed by mobile clients, including versioning, pagination, error contracts, and idempotency for financial operations.- Solid application security background: OWASP Top 10, secure authentication and session management (JWT, refresh token rotation), authorization models, secrets management, encryption at rest and in transit, and dependency and supply-chain security (npm audit, lockfile discipline).- Experience with systems where data integrity is critical — financial, payments, ledger, billing, or transactional platforms.- Automated testing discipline in the Node.js ecosystem (Jest, Vitest, Supertest) covering unit, integration, and API-level tests.- Practical experience with Docker, CI/CD pipelines, and cloud infrastructure (AWS or similar).- Strong debugging and production troubleshooting skills, including profiling Node.js performance issues and memory leaks, and on-call ownership of live incidents.- Ability to work independently, make sound architectural decisions, and be fully accountable for outcomes.- Good written and spoken English.Preferred:- Prior experience in fintech, banking, payments, trading, or commodities.- Experience integrating with ERP systems, identity verification providers, or payment gateways.- Experience with real-time or near-real-time pricing and market data flows (WebSockets, Socket.IO, or Server-Sent Events).- Experience with caching and job/queue processing in Node.js (Redis, BullMQ, RabbitMQ, or Kafka) and event-driven design.- Experience leading or mentoring engineers, or being the senior-most backend engineer on a product.- Familiarity with monorepo tooling and shared-package management for multi-service Node.js codebases.What we are not looking for:- Someone who needs a fully defined ticket to start working.- Someone who has only worked as one contributor inside a large team without ever owning a system end to end.