Open to opportunities

Vahid K

@vahidk1

Senior full-stack & backend engineer and Technical Team Lead building scalable SaaS, marketplaces, and real-time systems.

Turkey

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What I'm looking for

I’m looking for remote or international roles where I can lead system architecture, deliver reliable SaaS/marketplace backends, and ship high-performance full-stack features with strong observability, security, and release discipline.

I’m a Senior Software Engineer and Technical Team Lead with 7+ years of experience delivering SaaS platforms, digital marketplaces, real-time IoT systems, and high-performance backend services. I work end-to-end across architecture, product development, AWS infrastructure, security, deployment, observability, and production support.

At GEMGEM, I was promoted to Technical Team Lead after one year and led a nine-person cross-functional team. I owned technical architecture, sprint planning, code reviews, release management, and delivery coordination—supporting weekly production releases with 99.9%+ platform uptime for ~1,200 monthly active users and 7,000+ marketplace listings.

I’m hands-on with performance, reliability, and product impact. For example, I reduced Elasticsearch search latency from ~10 seconds to under 400 milliseconds, improved SEO and crawling/metadata workflows, and raised Core Web Vitals and Lighthouse scores from ~25 to 90+—while integrating Stripe, PayPal, and CoinGate with webhook processing and idempotency controls.

Earlier, at Datall Co., I led an IoT platform effort across Nuxt.js, NestJS, and Cassandra, and built high-performance C++/Qt backend systems using SOLID principles, Apache Kafka/ZeroMQ, and WebSocket-based real-time services. I bring mentoring and delivery rigor—coding, system design, and technical interviewing—so teams can ship confidently in production.

Experience

Work history, roles, and key accomplishments

Current

Technical Team Lead

Current

GEMGEM

Jan 2025 - Present (1 year 6 months)

Technical Team Lead overseeing marketplace engineering delivery, architecture, sprint planning, code reviews, and release management for a platform with monthly active users and large listing volume. Improved Elasticsearch search latency, upload-form performance, uptime, and production reliability while migrating Nuxt and integrating payment and OpenAI-powered features.

Senior Full-Stack Engineer

Agate Enchantment

Apr 2026 - Jul 2026 (3 months)

Senior Full-Stack Engineer delivering client SaaS dashboards and web tools end-to-end, from stakeholder discovery and UX to architecture, implementation, deployment, and post-launch support. Implemented React and NestJS-based solutions and configured Cloudflare edge and release workflows for consistent deployments.

React NestJS WordPress Vite HTML Cloudflare Edge Caching Rollback Readiness

Senior Software Engineer

GEMGEM

Jan 2024 - Dec 2024 (11 months)

Senior Software Engineer at GEMGEM supporting delivery of backend and platform capabilities for a marketplace serving monthly active users and thousands of listings. Worked remotely on engineering execution across development, testing, staging, and production environments.

Senior Backend Developer C++/Qt

Datall Co.

May 2022 - Mar 2024 (1 year 10 months)

Senior Backend Developer focused on building high-performance C++ and Qt backend services and reusable frameworks. Implemented messaging and real-time communication with Kafka, ZeroMQ, REST, and WebSocket, and improved runtime performance and concurrency under load.

C++Qt Framework SOLID Design Object Oriented Design Kafka ZeroMQ C++ HTTP Server WebSockets Multithreading Performance Profiling Concurrency Docker Systemd Token Based Authentication

Technical Team Lead & Full-Stack Dev

Datall Co.

Apr 2021 - May 2022 (1 year 1 month)

Technical Team Lead and Full-Stack Developer leading an early-stage IoT platform team spanning web applications, real-time data pipelines, backend services, and client deployments. Built with Nuxt.js and NestJS using Cassandra, and implemented MQTT-over-WebSocket and JWT-based authentication with role/policy controls.

Technical Team Leadership IoT Platform Development Data Pipelines Nuxt.Js NestJS Cassandra MQTT JWT Role Based Access Control Telemetry

Full-Stack & Frontend Developer

AKOInTech

Jul 2019 - Apr 2021 (1 year 9 months)

Full-Stack & Frontend Developer promoted within six months while contributing to trading and IoT products. Delivered a trading platform with WebSocket live chat and notifications and built an IoT platform using Nuxt.js and related backend and database services.