Backend Engineer (Node.js/TypeScript) at Tezza Business Solutions Ltd

About the Job

• We are building on top of the IDURAR Open-Source foundation (MERN Stack) and transforming it into a scalable, multi-tenant SaaS capable of handling millions of transactional and behavioral data points across the continent.

The Role

• We are looking for a Mid to Senior Backend Engineer to join our hybrid work team and to own the architecture of our "Growth Engine."
• You will move beyond simple CRUD APIs to build complex Event-Driven Systems, Offline Sync Protocols, and High-Volume Marketing Queues.
• You will work closely with the Solution Architect and the rest of the development team to ensure our platform is fast, resilient in low-bandwidth environments, and capable of delivering real-time Customer Intelligence (CI).

Key Responsibilities

• Core Architecture: Lead the migration of our Modular Monolith (Express.js) towards a structured, Service-Oriented architecture (NestJS/TypeScript) to support scale.
• High-Volume Queues: Design and implement robust background job processing using Redis & BullMQ to handle marketing blasts (SMS/WhatsApp/Email) without blocking the main API thread.
• Offline Synchronization: Build the "Sync Service" that handles data conflict resolution and delta updates between our MongoDB backend and the React Native (WatermelonDB) mobile app.
• Customer Intelligence Engine: Write complex MongoDB Aggregation pipelines to calculate real-time RFM (Recency, Frequency, Monetary) scores and Customer Health metrics.
• Integrations: Build secure, scalable integrations with third-party providers including Paystack/Flutterwave (Payments), Meta Graph API (Social), and Africa’s Talking (SMS).
• API Design: Develop flexible GraphQL and REST endpoints that allow our frontend to fetch "Customer 360" data efficiently.
• Quality & Security: Enforce TypeScript strict typing, write comprehensive unit/integration tests (Jest), and ensure multi-tenant data isolation at the middleware level.

What We Are Looking For
Technical "Must Haves":

• 4+ years of backend engineering experience with Node.js.
• TypeScript Expert: You don't just use any; you understand generics, interfaces, and strict type safety.
• Database Mastery: Deep experience with MongoDB (Schema design, Indexing, and Aggregation pipelines). You know how to model data for performance.
• Message Queues: Proven experience with Redis (caching and queuing with BullMQ/Sidekiq equivalent).
• API Standards: Strong grasp of RESTful principles and GraphQL schema design.

Technical "Nice to Haves":

• Experience with NestJS framework.
• Familiarity with the IDURAR open-source ERP platform.
• Experience building Offline-First applications (Sync protocols).
• Knowledge of Docker and Kubernetes (DevOps basics).
• Background in AdTech, CRM, or FinTech in the African context.

The Challenges You Will Solve:

• The "Burst" Problem: How do we send 50,000 SMS notifications for a client’s flash sale in 5 minutes without crashing the dashboard for everyone else?
• The "Offline" Problem: How do we sync 500 new "Quick Orders" from a field agent's tablet when they reconnect to a slow 3G network, ensuring no data is lost?
• The "Intelligence" Problem: How do we calculate a VIP Score for a customer in real-time based on their last 50 transactions across different branches?

Why Join MarketEdge?

• Build for Impact: You aren't just moving tickets; you are building the "Operating System" for African businesses.
• Technical Depth: You will work with complex problems like eventual consistency, event sourcing, and high-concurrency queues.
• Agile Culture: We value shipping code that works. We focus on "Definition of Done" that includes performance on slow networks, not just functionality on high-speed Wi-Fi.