CTO @ Fleksup / Istanbul

I architect
platforms that
scale

Engineering leader and hands-on architect with 16+ years building distributed systems, event-driven microservices and cloud-native SaaS — across e-commerce, ERP, marketplace, cargo and payment ecosystems.

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16+
years shipping production software
50+
microservices on Azure AKS
1,000+
customer environments supported by the platform
~10
core applications architected from the ground up
01 — About

Strategy in the boardroom.
Code in the critical path.

I lead the architecture and development of multi-tenant, event-driven microservice platforms that keep ERP systems, marketplaces, cargo providers, payment systems and financial services in sync — at high volume, around the clock.

My focus is resilient, production-grade systems: scalability, maintainability and performance by design, backed by observability you can actually trust. I stay hands-on in system design and critical implementations while defining technical strategy, platform roadmap and engineering standards for the teams around me.

  • 01
    API-first, event-driven. Contracts before code; asynchronous by default where the business allows it.
  • 02
    Observable or it didn't happen. Metrics, logs and traces are part of the definition of done.
  • 03
    Leaders who still build. Mentoring, hiring and governance — without losing touch with the codebase.
02 — What I build

Integration platforms
that never miss a message.

A simplified view of the kind of system I design: a multi-tenant integration core, an event backbone, and dozens of external ecosystems kept in sync. Hover a layer.

Sources
ERP systems
E-commerce stores
CRM
Platform core · AKS
API GatewayREST · gRPC · OAuth2
Tenant services.NET · ASP.NET Core
Event busRabbitMQ · retries · DLQ · idempotency
PostgreSQL
MongoDB
Redis
Observability · Prometheus · Grafana · Loki · Jaeger
Ecosystems
Marketplaces
Cargo providers
Payment & finance

Distributed systems

Microservices, event-driven workflows and messaging architectures designed for failure — retries, idempotency and back-pressure built in.

Cloud-native platforms

Kubernetes on Azure AKS, CI/CD and infrastructure governance for a 50+ service ecosystem serving 1,000+ customer environments.

Observability

Prometheus, Grafana, Loki and Jaeger — metrics, logs and distributed traces wired in from day one.

Engineering leadership

Technical strategy, roadmap and governance; Agile delivery, hiring, onboarding and mentoring across frontend, backend and mobile teams.

03 — Selected work

Not just what I did —
what changed because of it.

Three engagements that shaped how I lead: one platform transformation, one integration problem at volume, one engineering organization.

01Fleksup · CTO

From monolith to a cloud-native platform

Context
A multi-platform integration product built as monolithic applications, serving a large and growing customer base.
Approach
Led the move to microservices on Azure AKS: service boundaries, an event-driven backbone on RabbitMQ, gRPC/REST contracts, CI/CD — and observability with Prometheus, Grafana, Loki and Jaeger from day one.
Outcome
A 50+ microservice ecosystem supporting 1,000+ customer environments, with metrics, logs and traces across services.
02Fleksup · AN Software

Keeping commerce ecosystems in sync

Context
Merchants depend on ERP systems, marketplaces, cargo providers and payment systems staying in sync — at high volume, around the clock.
Approach
API-first integration standards and asynchronous, event-driven synchronization workflows — built on more than a decade of ERP, marketplace and virtual-POS integration work.
Outcome
Shared integration standards across backend and frontend teams, and a platform designed for high-volume synchronization.
03ICRON · Lead → Team Lead

Scaling an engineering organization

Context
An established enterprise software company building supply-chain optimization products for leading companies.
Approach
Built ~10 applications for AI and optimization teams — drag-and-drop algorithm design, ETL, client apps — then the organization around them: hiring, mentoring, architecture ownership and the company's full move to the cloud.
Outcome
A web engineering organization that scaled with the company — built on shared architecture, clear ownership and a culture of mentoring.
How I lead
Strategy & roadmapTechnical strategy and platform roadmap aligned with long-term business goals.
GovernanceArchitectural decisions, secure SDLC, infrastructure governance and platform reliability.
PeopleHiring, onboarding, mentoring and performance development across teams.
DeliveryAgile delivery from planning to production — while staying hands-on in critical design.
04 — Experience

16 years, one throughline:
systems that connect businesses.

  1. Jan 2025 — Present Istanbul
    Chief Technology Officer @ Fleksup

    I explore emerging technologies, design innovative architectures and build sustainable solutions for complex systems.

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    Multi-platform integrator SaaS. Architecting and leading multi-tenant, event-driven platforms behind large-scale e-commerce integration operations.

    • Lead cloud-native infrastructure across a 50+ microservice ecosystem on Microsoft Azure (AKS), with CI/CD, observability and distributed messaging.
    • Led migration from monolithic applications to cloud-native microservices supporting 1,000+ customer environments.
    • Design scalable ERP, marketplace, cargo and payment integrations handling high-volume synchronization workflows.
    • Build high-availability backend services with RabbitMQ, gRPC, REST, PostgreSQL, MongoDB and Redis.
    • Define technical strategy and platform roadmap; drive API-first architecture and integration standards.
    • Drive applied AI: RAG architecture, applied machine learning — and next, sales forecasting and stock optimization.
    • Own Agile delivery, architectural decisions, technical governance, secure SDLC and platform reliability; mentor teams while staying hands-on.
    Azure AKSMicroservicesRabbitMQgRPCObservabilityRAG
  2. Jan 2023 — Jan 2025 Istanbul
    Software Engineering Team Lead @ ICRON

    Scaling teams into an engineering culture — turning complex algorithms into products people trust every day.

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    Led frontend, backend and mobile teams building supply-chain optimization and distributed planning products.

    • Helped scale the web engineering organization alongside the company's growth, in close partnership with the CTO.
    • Hired and trained new engineers — onboarding, mentoring, coaching and performance development.
    • Designed and tracked all technical architectures, and dedicated each one to the team that would own it.
    • Owned delivery from development to production support, along with security processes, code reviews and engineering standards.
    Team buildingHiring & mentoringArchitecture governanceAngularASP.NET Core
  3. Jun 2018 — Jan 2023 Istanbul
    Senior Software Engineer @ ICRON

    Building the tools that let AI and optimization experts do their best work — visual, collaborative and fast at big-data scale.

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    ICRON's industrial engineers develop AI and optimization models for supply chains. I engineered the products they — and their customers — work in.

    • Built team tooling for model developers: drag-and-drop interfaces for building algorithms together, ETL tools and collaboration tools.
    • Designed client applications where long-established companies in Türkiye explore AI outputs and manage their optimization algorithms and processes.
    • Engineered high-performance products for big data: .NET Core backends talking over TCP to an in-memory C++ engine with Protocol Buffers.
    • Laid the foundations of ~10 applications, including an in-house version control system.
    • Owned the company's cloud evolution end to end; set up the Git architecture, CI/CD and automated releases with Azure DevOps.
    • Designed project architectures from scratch — security included — and handed them over to teams.
    • Explored new technologies and brought them to production: Azure Marketplace Integration Portal, Go-based internal web servers, observability with Grafana, Loki, Jaeger and Prometheus.
    .NET CoreAngularTCP · ProtobufC++ interopETLAzure DevOps
  4. Jun 2015 — Feb 2017 Haaksbergen, NL
    Senior Technical Team Lead & Operation Manager · Senior Software Engineer @ 2go-mobile b.v.

    Building across borders — leading international teams and the platforms behind everyday municipal services in the Netherlands.

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    Enterprise web and mobility solutions for municipal and enterprise customers in the Netherlands, delivered by teams across countries.

    Team Lead & Operation Manager · 2016 — 2017
    • Led frontend, backend, desktop and mobile teams for international enterprise customers.
    • Ran the Turkey office's operations; worked onsite with distributed teams in the Netherlands.
    • Managed planning, reporting and budgeting for TÜBİTAK and KOSGEB-supported projects.
    • Drove modernization and modularization of enterprise systems, improving maintainability and release efficiency.
    • Raised engineering standards, testing practices and development workflows across the organization.
    Senior Software Engineer · 2015 — 2016
    • Owned backend architecture and APIs for Ximmio, Afval Kalender and Afval Orde platforms.
    • Built ASP.NET Web API / MVC applications on MSSQL and MySQL; testing with Selenium and NUnit.
    • Applied SOLID principles, dependency injection and modular design to improve the architecture.
    • Developed AWS-based tooling for data transfer, backups and service health monitoring.
    International teamsASP.NET Web APIAWSSelenium · NUnit
  5. 2009 — 2018 İzmir

    Earlier career

    Nine years of connecting commerce — the e-commerce and ERP integration foundation my forecasting research builds on today.

    2012 — 2018 · İzmir AN Software Agency Software Development Manager & Co-Founder · in parallel with full-time roles

    E-commerce and ERP integrations end to end; B2B, B2C and marketplace solutions; virtual POS with major Turkish banks, iyzico, PayU and PayPal.

    2009 — 2012 · İzmir KobiMaster Software Developer

    B2B, B2C and private-shopping platforms; ERP and Microsoft Dynamics CRM integrations; consultancy for 100+ customer projects.

Full role-by-role history on LinkedIn ↗

05 — Stack

Tools I trust
in production.

  • .NET
  • ASP.NET Core
  • C#
  • gRPC
  • REST APIs
  • RabbitMQ
  • SignalR
  • OAuth2
  • Swagger
  • Go
  • Kubernetes
  • Azure AKS
  • Docker
  • Azure DevOps
  • CI/CD
  • Prometheus
  • Grafana
  • Loki
  • Jaeger
  • PostgreSQL
  • MongoDB
  • Redis
  • Azure Cosmos DB
  • Dapper
  • Entity Framework
  • MSSQL
  • Angular
  • TypeScript
  • Ionic
  • Python
  • pandas
  • LightGBM
  • SHAP
  • Kaggle Notebooks
  • RAG / LLMs
Domains E-commerceERP integrationsMarketplace integrationsPayment systemsCargo integrationsMulti-tenant SaaSSupply chain
06 — Research & AI

Where engineering
meets machine learning.

For 16 years I've built the systems that move commerce data. Now I study what that data can predict — and how to make those predictions trustworthy enough to act on.

Ongoing research M.Sc. Thesis · Beykent University

SKU-level demand forecasting with clustering, cluster-specific stacking and explainability

Products don't share one demand pattern: some sell smoothly, others are intermittent or lumpy. My research asks when a model per demand regime beats one global model — comparing global and cluster-specific stacking ensembles, and choosing between them per regime using only honest cross-validation forecasts, never the holdout.

  1. 01DataUCI Online Retail II
  2. 02Featureslags · rolling stats · ADI / CV²
  3. 03Demand regimesK-means · SBC classes
  4. 04Stackingglobal vs. cluster-specific
  5. 05Explain & testSHAP · Wilcoxon · Holm
LightGBM (Tweedie)SVRCroston · SBA · ADIDA · IMAPATreeSHAPMASEARI

→ A journal article based on this work is in preparation.

Applied AI @ Fleksup

RAG architecture

Retrieval-augmented generation that grounds LLM answers in real domain and platform knowledge.

Applied machine learning

Bringing ML into an integration platform — where high-volume commerce data already flows.

Next

Sales forecasting & stock optimization

Taking my thesis research to production: SKU-level forecasts and smarter stock decisions for merchants.

Interests Demand forecastingIntermittent demandEnsemble learningClusteringExplainable AIRAG & LLM systems
07 — Education & credentials

Engineer, economist,
perpetual student.

2024 — Present
M.Sc. Computer Engineering (thesis in progress)Beykent University
2020 — 2021
MBA, Business Administration & ManagementIşık University
2012 — 2015
B.Sc. Software EngineeringBahçeşehir University
2009 — 2014
B.Sc. EconomicsAnadolu University
2007 — 2009
Associate Degree, Computer ProgrammingSüleyman Demirel University
Certification
  • Microsoft Certified: Azure Cosmos DB Developer SpecialtyMicrosoft
Award

Bilişim Yıldızları — e-Dönüşüm Competition

Languages
TurkishNative
EnglishProficient
RussianBeginner
08 — Contact

A hard problem
worth solving?

Open to research collaborations, talks and conversations on platform architecture, applied machine learning and demand forecasting.

yunusemregl@gmail.com Download CV ↓ LinkedIn ↗