Full Stack Developer

Responsibilities:

ERP Integration Development:

• Design and build integration connectors for ERPs (Microsoft Dynamics, Odoo etc)
• Develop middleware that syncs invoices, credit notes, and payment data between ERP systems and our platform
• Map ERP invoice data models to FIRS UBL 2.1 format (our existing UBL generator handles the final transformation)
• Build webhook receivers for real-time ERP event triggers (invoice posted, payment recorded)
• Handle data mapping edge cases: multi-currency, partial payments, tax code translation, unit of measure conversion

Backend Development (NestJS):

• Extend our REST API with new endpoints for ERP integration workflows
• Build queue-based processing for bulk ERP invoice sync using BullMQ
• Implement retry logic and error handling for unreliable ERP API connections
• Write integration with the FIRS MBS API (validate, sign, transmit invoices)
• Maintain and extend TypeORM entities and database migrations (PostgreSQL)
• Build audit logging for all ERP sync operations

Frontend Development (Next.js):

• Build ERP integration configuration UI (connection setup, field mapping, sync status)
• Create dashboards showing sync status, errors, and processing history
• Extend existing document management pages with ERP-sourced data indicators
• Implement real-time progress indicators for bulk sync operations

API & Platform:

• Design APIs that external ERP plugins/extensions can consume
• Write comprehensive API documentation for ERP vendors building their own integrations
• Build and maintain sandbox environments for integration testing
• Support third-party developers integrating with our API

Requirements:

• 3 years of full-stack development experience with TypeScript
• Production experience with NestJS or similar Node.js backend frameworks (Express, Fastify)
• Production experience with React (Next.js preferred)
• Hands-on experience integrating with ERP APIs (Business Central OData/REST APIs or Finance & Operations Data Entities)
• Strong understanding of REST API design, authentication (OAuth2, API keys), and webhook patterns
• Experience with PostgreSQL or similar relational databases
• Experience with Redis for caching or message queuing
• Understanding of data mapping between different system schemas (ERP to standardised formats)
• Comfortable working with external API documentation and debugging HTTP integrations
• Experience with Microsoft Azure AD / Entra ID authentication and the Microsoft Graph API ecosystem
• Familiarity with Dynamics 365 Business Central AL extensions or custom connectors
• Experience with BullMQ, RabbitMQ, or similar job queue systems
• Experience with TypeORM or similar ORMs
• Understanding of accounting/invoicing data models (chart of accounts, tax codes, payment terms, document types)
• Experience building multi-tenant SaaS applications
• Familiarity with UBL (Universal Business Language) or similar e-invoicing standards

Nice to Have:

• Experience integrating with other ERP systems: SAP Business One, Sage, Odoo, QuickBooks, Xero
• Familiarity with the FIRS e-invoicing system or Nigerian tax compliance
• Experience with Docker, CI/CD pipelines, and cloud deployments (AWS preferred)
• Knowledge of cryptographic operations (AES encryption, RSA signing, certificate handling)
• Contributions to open-source ERP connectors or integration frameworks
• Experience with Power Automate or Azure Logic Apps for low-code ERP integration flows