Senior Backend Developer (Node.js, AWS & Payment Systems)

Job Summary

We are seeking a highly skilled Senior Backend Developer with at least 57 years of hands-on experience in building scalable, secure, and high-performance backend systems using Node.js. The ideal candidate will have extensive expertise in AWS, strong knowledge of backend security, database design, and query optimization, along with deep experience in payment gateway integrations, specifically Stripe, Mollie and Adyen, including subscription and recurring billing management. Exposure to AI-driven solutions is an added advantage.

Key Responsibilities

Design, develop, and maintain scalable backend services and RESTful APIs using Node.js

Architect, deploy, and manage cloud-native solutions on AWS (EC2, Lambda, S3, RDS, DynamoDB, CloudWatch, etc.)

Integrate and manage payment gateways (Stripe, Mollie, Adyen), including

Subscription lifecycle management

Recurring billing, upgrades/downgrades, proration

Webhooks handling and reconciliation

Payment failures, retries, and invoicing

Ensure secure payment processing and compliance with industry standards (PCI-DSS, data protection)

Implement secure authentication and authorization mechanisms (JWT, OAuth, IAM)

Optimize database schemas, queries, and indexes for performance and scalability

Enforce security best practices across APIs and backend services (OWASP, encryption, rate limiting)

Collaborate closely with frontend, DevOps, and product teams to deliver end-to-end solutions

Perform code reviews and promote engineering best practices

Troubleshoot production issues and perform root-cause analysis

Contribute to system architecture decisions and backend technical strategy

Required Skills & Qualifications

At least 57 years of backend development experience

Strong expertise in Node.js (Express, NestJS, or similar frameworks)

Extensive hands-on experience with AWS cloud services

Proven experience with Stripe, Mollie and Adyen payment gateways

Strong understanding of subscription-based billing models and payment workflows

Experience in handling payment webhooks, retries, refunds, and chargebacks

Proficiency in relational and NoSQL databases (PostgreSQL/MySQL, MongoDB, DynamoDB)

Deep knowledge of database query optimization and performance tuning

Solid understanding of security concepts (authentication, authorization, encryption, secure APIs)

Experience with CI/CD pipelines, Git-based version control, and deployment strategies

Experience with message queues and event-driven systems (SQS, Kafka, RabbitMQ)

Good to Have (Added Advantage)

Experience with AI/ML integrations, AI APIs, or data-driven backend systems

Knowledge of serverless architectures and containerization (Docker, ECS, Kubernetes)

Familiarity with monitoring, logging, and observability tools

Prior experience working on SaaS platforms or high-traffic applications

Our Offerings

A competitive remuneration package commensurate with your experience, educational background, and skillset.

Opportunities for career progression: Assist in the establishment and expansion of various startups at an accelerated pace. Ambitious to lead a team of freelancers We provide a supportive environment to realize your aspirations.

Collaborative team ethos: We are united in our pursuit of excellence and fostering a positive, motivating atmosphere to ensure you reach your full potential.

Work Schedule

Day shift (European Timings)

Monday to Friday

Compensation: 60,000.00 - 90,000.00 per month

Experience

Back-end development: 5 years (Required)

Node.js: 5 years (Required)

Stripe Payment Gateway: 5 years (Required)

Ayden Payment Gateway: 3 years (Required)

Mollie Payment Gateway: 3 years (Required)

Work Location: Remote .