Karyna Siddik

Karyna Siddik

Italy (born in Kiev, Ukraine) karynatariq@gmail.com karynatariq karyna-tariq

Senior Software Engineer with 5+ years building and maintaining production systems, with a strong focus on backend engineering, marketplace integrations, and cloud architecture. Experienced with Node.js, TypeScript, Python, PostgreSQL, MongoDB, AWS, serverless, microservices, Kafka, and Kubernetes. Engineered order-processing workflows handling 10K+ daily orders across marketplace and WMS integrations, covering inventory synchronization, third-party APIs, payment gateways, and subscription plans.

Experience

Senior Software Engineer | Skupreme | Miami, US (Remote) | January 2021 - June 2026

JavaScript, TypeScript, Node.js, Express.js, PostgreSQL, MongoDB, AWS, Serverless, Microservices, Kafka, Kubernetes

Built and maintained production backend services supporting marketplace and WMS integrations, order processing, inventory synchronization, and third-party API workflows.
Developed a dynamic multi-tenant architecture, reducing integration time by 25% and boosting platform reliability by 20%.
Implemented advanced backend API optimizations, reducing response times by 40% and increasing concurrent user capacity by 25%.
Engineered scalable microservices architecture, cutting deployment times by 50% while ensuring uninterrupted service during updates.
Built automated functions handling 10K+ daily orders and synchronized inventory across multiple platforms.
Orchestrated 3rd party integrations with major e-commerce marketplaces, enabling seamless order sync, catalog management, and real-time inventory updates.
Integrated address validation APIs, reducing errors by 30% and improving shipping accuracy by 15%.
Integrated payment gateways and subscription functionality, supporting subscription plans and multiple payment methods for recurring and transactional payment workflows.
Investigated production issues across integrations, data synchronization, APIs, and distributed workflows by tracing failures, identifying root causes, and implementing corrective fixes.
Contributed to architecture and refactoring decisions focused on reducing duplicated integration code, improving maintainability, and reducing technical debt.
Led client collaboration, conducted demos, and addressed challenges, achieving 30% increase in client satisfaction.
Mentored junior engineers, fostering a culture of innovation and excellence across the organization.

Backend Engineer | Freelancer | Remote | January 2021 - July 2021

JavaScript, Node.js, Express.js, MongoDB, Firebase, AWS Lambda, EC2

Maintained consistent 5-star ratings for project deliverables across 10+ diverse projects.
Delivered tailored backend solutions across diverse industries, ensuring optimal performance.
Integrated third-party APIs and cloud services including AWS Lambda, EC2, and NAT gateways.

Skills

Backend & APIs: Node.js, Express.js, Python, FastAPI, Java, REST APIs, GraphQL, OAuth

Databases: MongoDB, PostgreSQL, DynamoDB, Firebase, Elastic Search

Cloud & DevOps: AWS (Lambda, EC2, S3), GCP, Kubernetes, Serverless, CI/CD, NAT Gateways

Architecture & Messaging: Microservices, Serverless, Event-driven systems, Kafka, Multi-Tenant, Infrastructure as Code, API integrations, Cron Schedulers

Commerce & Payments: Marketplace integrations, WMS integrations, Order/inventory synchronization, Payment gateways, Subscription plans, Payment methods

Testing & Tooling: Mocha, Chai, Vitest, Bun, CI/CD, Git

Languages & Tools: JavaScript, TypeScript, Python, Java, Git, NPM, Postman

Leadership: Agile/Scrum, Team Leadership, Mentorship, Code Review, Client Collaboration

Certifications

Foundations: Data, Data, Everywhere ↗

Google | 2024

M121: The MongoDB Aggregation Framework ↗

MongoDB University | 2021

Projects

E-Commerce Automation Platform

Node.js, Express.js, MongoDB, AWS, Serverless, Microservices

Scalable multi-tenant platform with full CRUD operations, inventory sync across multiple platforms, and automated order processing handling 10K+ daily orders. Built analytics dashboards with predictive algorithms for demand forecasting.

Marketplace Order & Catalog Sync

Node.js, Event-Driven Pipelines, MongoDB, AWS

Real-time order synchronization engine connecting Amazon, Shopify, and eBay into a unified backend. Automated catalog listing, inventory updates, and order routing across platforms with event-driven pipelines.

Multi-Tenant Backend Architecture

Node.js, Microservices, CI/CD, AWS, Infrastructure as Code

Dynamic multi-tenant architecture reducing integration time by 25%, featuring 3rd party marketplace integrations, address validation APIs, and scalable microservices with automated CI/CD pipelines.

/projects/multi-tenant-backend-architecture

Multi-Tenant Backend Architecture

Dynamic multi-tenant architecture reducing integration time by 25%, featuring 3rd party marketplace integrations, address validation APIs, and scalable microservices with automated CI/CD pipelines.

Node.jsMicroservicesCI/CDAWSInfrastructure as Code

// task

Dynamic multi-tenant architecture reducing integration time by 25% with scalable microservices.

// what I did

Designed a dynamic multi-tenant backend architecture that reduced integration time by 25%. Delivered 3rd party marketplace integrations, address validation APIs, and scalable microservices backed by automated CI/CD pipelines, giving each tenant isolation and reliability without duplicating infrastructure.

// highlights

Reduced integration time by 25% with a dynamic multi-tenant design.
Delivered marketplace integrations and address validation APIs.
Built scalable microservices with automated CI/CD pipelines.

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