Backend • Elasticsearch • Distributed Systems

Building scalable backend systems, search platforms and high-performance data pipelines.

Backend-focused Software Engineer with strong experience in Python, Flask, Elasticsearch, Kubernetes, MongoDB, Redis and production-grade microservice architectures.

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33 Billion+ documents indexed/searchable
50K+ concurrent requests handled
5+ Python/Flask microservices

Technical Skills

Core technologies I work with

Organized around backend engineering, data systems, DevOps, mobile development and frontend delivery.

PY

Backend Engineering

Python, Flask, REST APIs, microservices, API performance, caching and scalable service design.

ES

Search & Analytics

Elasticsearch cluster design, full-text search, query optimization, index lifecycle and analytics systems.

DB

Databases & ETL

MongoDB, Redis, SQL, data modeling, indexing strategies, ingestion pipelines and processing workflows.

K8

Cloud-Native Delivery

Kubernetes, Docker, containerized deployments, service maintenance and production operations.

FL

Mobile Applications

Flutter, Dart, Firebase, real-time data flows and mobile product development from prototype to production.

JS

Frontend Basics

JavaScript, React, HTML, CSS and clean interfaces for internal tools, dashboards and product pages.

Experience

Professional background

Software Engineer

Nov 2022 – Present

CatchProbe Intelligence Technologies

  • Architected and deployed 5+ Python/Flask microservices handling 50K+ concurrent requests, reducing API response time by 35% through caching optimization.
  • Designed and implemented a 3-node Elasticsearch cluster supporting full-text search across 100M+ documents with sub-second query latency.
  • Reduced storage costs by 20% through Elasticsearch index optimization, mapping improvements and lifecycle-aware data modeling.
  • Built high-performance ingestion and processing pipelines for large-scale security intelligence datasets using MongoDB, Redis and ETL workflows.
  • Deployed and maintained containerized applications on Kubernetes and Docker, improving release reliability and operational consistency.

R&D Manager

2019 – 2022

Compru

  • Led R&D initiatives for a 4-person engineering team, shipping 3 production features that reached 50K+ monthly active users.
  • Mentored 2 junior developers, enabling 1 promotion and improving code review turnaround by 40%.
  • Developed mobile applications with Flutter and Dart, delivering cross-platform features with maintainable architecture.
  • Built real-time systems using Firebase and implemented backend services with Python and SQL.

R&D Team Lead

2019 – 2022

Google Developer Student Club

  • Led Flutter and Firebase-based development projects, turning learning topics into real application features.
  • Mentored 8+ student developers on mobile architecture and Firebase best practices.
  • Guided 5 portfolio-ready projects to production and supported 3 team members in securing internships at technology companies.

Network Intern

2018 – 2019

Allianz Turkey

  • Supported enterprise network infrastructure for 500+ users, assisting with daily monitoring, troubleshooting and device checks.
  • Resolved 95% of connectivity issues within SLA through proactive monitoring and root-cause documentation.
  • Reduced ticket resolution time by 25% through systematic troubleshooting workflows across routers, IP phones and video conferencing systems.

Focus Areas

What I can help build

Search Platforms

Elasticsearch-backed systems for full-text search, analytics, indexing, aggregations and high-volume document retrieval.

Backend APIs

Python/Flask APIs, microservice architecture, authentication flows, internal tools and production-ready service layers.

Data Pipelines

ETL workflows, ingestion systems, queue-backed processing, Redis-based caching and MongoDB-backed data models.

DevOps Delivery

Dockerized applications, Kubernetes deployments, monitoring-friendly services and repeatable release workflows.

Contact

Let’s build something scalable.

Available for backend, Elasticsearch, data pipeline and cloud-native software engineering opportunities.

berkaysah@outlook.com