Software Engineer – NestJS & Backend Architecture

Quantic; Exton (PA); On-site; USD 120,000 - 160,000; Full time

Benefits offered by this job

Employee stock plans

Job summary

Quantic is seeking a Senior Software Engineer specializing in NestJS and TypeScript to lead backend microservice design and scaling for our POS platform, focusing on low-latency transaction processing and gateway integrations.

This is a 100% onsite role in Exton, PA, with opportunities to shape distributed systems, data sync, and cloud deployments in a fintech/POS environment. You will collaborate with product, DevOps, and security teams to ensure high availability and scalable architectures.

Qualifications

• 2+ years of software engineering experience focusing on NestJS, Node.js, and TypeScript.
• Experience with POS/fintech or payment processing is preferred.
• Strong knowledge of relational and NoSQL databases and caching systems.

Responsibilities

• Design, build, and maintain high-throughput backend services using NestJS and TypeScript.
• Develop secure RESTful and GraphQL APIs, WebSockets, and webhooks for terminals and POS apps.
• Architect distributed systems for fault tolerance and offline-online data sync.

Skills

NestJS

Node.js

TypeScript

RESTful APIs

GraphQL APIs

WebSockets

Tools

Docker

Kubernetes

AWS

GitHub Actions

Job description

We are seeking a highly motivated Senior Software Engineer specializing in NestJS and TypeScript to join the Quantic POS Platform team. In this role, you will lead the design, development, and scaling of core backend microservices and APIs that power our next-generation Point of Sale (POS) ecosystem. You will architect low-latency transaction processing systems, payment gateway integrations, and real-time data sync modules for retail and restaurant environments. If you are passionate about building resilient distributed systems using modern Node.js/NestJS frameworks in a fast-paced fintech/POS domain, this role is for you.

*** This is a 100% onsite role in our Exton office. No remote or hybrid work ***

Responsibilities

• NestJS & Node.js Core Development: Design, build, and maintain high-throughput, modular backend services using NestJS and TypeScript across the Quantic POS platform.


• API & System Integration: Develop secure RESTful and GraphQL APIs, WebSockets, and webhooks to power hardware terminals, mobile POS applications, online ordering systems, and third-party payment gateways.


• Distributed Architecture: Design and optimize distributed systems for fault tolerance, offline-online data synchronization, and high availability during peak transaction volumes.


• Database & Performance Optimization: Architect and optimize query performance across relational (PostgreSQL) and NoSQL/Caching layers (Couchbase, Redis) for sub-second POS checkout pipelines.


• Code Quality & Testing: Maintain clean code standards using NestJS dependency injection, object-oriented design (OOP), domain-driven design (DDD), and automated testing suites (Jest, Supertest).


• Cloud & DevOps Alignment: Collaborate with DevOps teams to deploy microservices on cloud infrastructure (AWS/Azure) utilizing Docker, Kubernetes, and automated CI/CD pipelines.


• Agile Collaboration: Participate actively in Agile ceremonies, translating complex POS product requirements into scalable technical architecture and actionable technical specs.

Experience & Qualifications

• Backend Expertise: 2+ years of software engineering experience with deep specialization in NestJS, Node.js, and TypeScript.


• POS & Fintech Domain Knowledge: Prior experience with Point of Sale (POS), payment processing/PCI compliance, order management, or high-concurrency transaction platforms is strongly preferred.


• Data Management: Advanced knowledge of relational databases (PostgreSQL, MySQL, SQL Server), NoSQL solutions (MongoDB), and in-memory stores (Redis) for real-time state management.


• Messaging & Microservices: Hands-on experience with microservices architecture, event-driven systems, and message brokers (RabbitMQ, Kafka, or NestJS Microservices).


• Cloud & Infrastructure: Familiarity with AWS or Azure services, Docker containerization, and modern CI/CD tools (GitHub Actions, GitLab CI).


• Testing & Security: Proficiency with unit/integration testing frameworks (Jest) and secure API design practices (OAuth2, JWT, rate limiting).


• Development Methodology: Proven experience operating in Agile/Scrum environments using Git workflow tools (GitHub).

Benefits: Qualified and exceptional candidates will be eligible for our future employee stock plans to be part of the company's growth.