Senior Back End Developer

About Way2Vat

Way2Vat is a global fintech company helping businesses recover VAT and manage cross-border tax compliance. The platform processes invoices and receipts worldwide, extracting structured financial data to automate tax recovery. The company is expanding its backend and data infrastructure to support AI-driven document processing at scale.

The Role – Senior Backend Engineer

We are seeking a hands-on Senior Backend Engineer to design, build, and scale core backend systems powering AI-driven financial data extraction and tax automation. This role focuses on high-performance, production-grade services that integrate with AI pipelines, handle large-scale document processing, and ensure reliability, scalability, and cost efficiency.

Responsibilities

• Design and implement scalable backend services for processing financial documents and structured data extraction
• Build and maintain APIs (GraphQL) consumed by internal systems and external clients
• Architect and optimize data pipelines that integrate with AI/LLM-based extraction systems
• Support both batch and real-time data processing workflows
• Improve system performance, reliability, and observability across distributed services
• Collaborate with AI engineers to productionize LLM pipelines and ensure efficient backend integration
• Optimize data storage, retrieval, and processing for high-throughput workloads
• Implement monitoring, logging, and alerting for production systems
• Lead backend best practices: code quality, testing, CI/CD, and system design
• Participate in architectural decisions and contribute to long-term technical strategy
• Demonstrate a can-do approach and strong, clear communication across teams

Tech Stack & Minimum Experience

• Overall 5+ years of experience
• Node.js (NestJS): 4+ years
• Python: experience preferred
• AWS: 2+ years
• GraphQL APIs: 2+ years
• CI/CD (CircleCI or equivalent): 2+ years
• Data & Processing: experience with distributed systems, event-driven architectures, batch & streaming pipelines (2+ years)
• SaaS experience is an advantage

Requirements

• 5+ years of backend engineering experience
• At least 3 years of hands-on experience with Node.js in production systems
• Strong experience designing and building scalable, distributed backend systems
• Proficiency in building APIs (GraphQL, REST) and microservices
• Strong understanding of data modeling, databases, and performance optimization
• Experience integrating backend systems with AI/ML or data processing pipelines (advantage)
• Solid understanding of system design, concurrency, and reliability patterns
• Experience working in production environments with CI/CD pipelines
• Excellent communication skills and a proactive, can-do approach

Nice to Have

• Experience with SaaS products and multi-tenant architectures
• Realtime & batch processing experience
• Familiarity with Big Data technologies (Spark, Kafka, Flink, etc.)
• Familiarity with LLM-based pipelines or AI infrastructure
• Background in high-scale data processing systems