
Mert Akcakaya
Verified Expert in Engineering
Software Developer
İzmir, Turkey
Toptal member since October 16, 2020
Mert is a distinguished software engineer with over ten years of experience developing enterprise systems. He holds computer engineering and MBA degrees with exceptional software architecture and design, team management, and product management skills. Mert has delivered state-of-the-art software products, including complex industrial IoT solutions, financial payment systems, web and mobile applications, and various scalable back-end systems.
Portfolio
Experience
- C# - 9 years
- Technical Leadership - 6 years
- PostgreSQL - 5 years
- Microservices - 5 years
- Team Management - 5 years
- Azure - 3 years
- ASP.NET Core - 3 years
- .NET Core - 3 years
Availability
Preferred Environment
Amazon Web Services (AWS), C#, Azure, .NET, Docker, ASP.NET, ASP.NET Core
The most amazing...
...software product I've designed and built is an IoT middleware that is horizontally scalable and can handle thousands of connected devices.
Work Experience
Senior C# Developer
BaxEnergy Italia SRL - Main
- Implemented a proof of concept (PoC) for CI Server (OPC UA) integration into the Farsight platform.
- Established authenticated connection to the server, enabled the auto-discovery of assets, and facilitated reading/streaming data from data points. Implemented automated tests.
- Developed a configuration wizard in the front end using Next.js to connect to the CI Server.
Senior Software Engineer
BioReference Laboratories
- Developed and enhanced a patient-facing healthcare platform, improving user authentication, test result access, and payment management at scale.
- Led the rebuild of a laboratory management platform, modernizing architecture and enhancing maintainability, reliability, and testability.
- Designed and implemented a user migration system, securely transitioning 3+ million accounts to a new authentication provider, reducing costs and improving system efficiency.
- Developed infrastructure-as-code (IaC) solutions, standardizing cloud deployments and improving maintainability and operational efficiency.
Senior Software Engineer
Fonoa
- Led the design and implementation of invoice integrations, ensuring compliance with tax regulations across multiple countries.
- Improved software design by employing layered architecture, implementing a better validation system, and introducing automated tests to increase system maintainability and stability.
- Conducted requirement analysis and architectural planning for a new invoice integration, collaborating with partners to align business and technical requirements.
Senior Software Engineer
Defined AI
- Developed and maintained a payment microservice, optimizing performance and increasing test coverage.
- Containerized payment services, improving scalability and deployment efficiency.
- Designed and implemented a database migration tool, ensuring seamless data separation for microservices.
- Updated and optimized a translation service, identifying unintended resource usage and implementing cost-saving measures.
Senior Software Developer
Emakina Group
- Developed and maintained B2B commerce systems, improving business process automation.
- Built and optimized B2C eCommerce platforms, enhancing customer experience and platform stability.
- Improved code maintainability and reliability by introducing design patterns, dependency inversion, and automated testing methodologies.
Software Architect
ProSymmetry
- Developed a serverless API to cache route data, reducing external API usage by 95% and improving response times to under 150ms.
- Identified and resolved memory leaks in a project management platform, enhancing system stability.
- Migrated version control from SVN to Git, streamlining collaboration and development workflows.
Software Development Team Leader
Sestek
- Led a team of developers and support engineers, overseeing product development and system improvements.
- Diagnosed and resolved critical application issues, significantly reducing support tickets and enhancing stability.
- Modernized a large-scale web application, progressively rewriting components with modern technologies.
- Implemented CI/CD pipelines and automated testing, accelerating development cycles and improving software quality.
- Conducted internal workshops to enhance team productivity and upskill engineers.
Product Owner, Full-stack Developer
Self-directed Project
- Built an Android application with a cloud back end, providing product details, allergens, and pricing comparisons.
- Developed a distributed data aggregation system, enabling continuous product information updates.
- Designed a scalable back end for barcode and product data retrieval, ensuring seamless performance.
- Conducted market research and competitive analysis, assessing feasibility and adoption challenges.
- Evaluated business potential, leading to a strategic decision to discontinue the project due to scalability and market constraints.
Partner, Software Development Manager, Lead Developer
Biltera
- Designed and developed Kraken, an IoT middleware enabling real-time RFID data processing and third-party system integration.
- Built enterprise tracking solutions for logistics, manufacturing, healthcare, and retail, improving operational efficiency.
- Led software architecture and development for asset tracking, workforce monitoring, and warehouse management systems.
- Managed cross-functional teams, overseeing project execution and ensuring successful delivery.
- Negotiated contracts with clients and suppliers, drafted statements of work (SOW), and optimized business operations.
- Led recruitment and training, ensuring technical excellence and team growth.
Experience
BioReference InsightDX
https://www.bioreference.com/physicians/why-bioreference/connectivity/Rewrote the application from the ground up, transitioning to a modular monolith architecture while updating outdated dependencies to improve maintainability, reliability, and performance. Introduced automated back-end testing, ensuring higher code quality and system stability. Enhanced the platform’s efficiency and scalability, optimizing workflows for healthcare professionals.
BioReference Patient Portal
https://www.bioreference.com/patient-portal/Worked on both front end and back end, implementing new features, optimizing performance, and improving maintainability. Led architectural improvements to ensure scalability and security, enhancing the platform’s ability to serve millions of users efficiently.
Crowdsource Payment Systems
https://www.defined.ai/I researched and developed payment integrations for PayPal and Payoneer. I optimized the microservice to increase the throughput dramatically.
Speech Analytics Web Application
https://www.sestek.com/Managed a team of developers and support engineers while remaining hands-on in modernizing legacy components, improving system architecture, and optimizing performance.
Diagnosed and resolved complex software issues, significantly reducing support tickets and enhancing platform reliability. Implemented CI/CD pipelines and automated testing, accelerating development cycles and improving software quality.
Conducted internal workshops to upskill team members and enhance productivity.
Kraken - IoT MIddleware
https://www.biltera.com.tr/RFID, barcode, and Bluetooth devices are connected to local nodes to form a network of parallel computation network. Inputs are analyzed, persisted, and distributed to different integration channels such as SAP.
It can track assets and personnel, determine the directionality of a moving object, take stocks, and much more.
Device management, device connectivity, notifications, and integrations are managed in a web application.
Kraken is used by the largest manufacturers, banks, and city hospitals in Turkey to automate their processes using IoT.
I was a partner of the company and acted as the architect, team leader, and product manager of the system.
Detaware - IoT Asset Tracking
https://www.biltera.com.tr/It reduces human error dramatically and speeds up the tracking and inventory-taking process by more than 95%. It achieves hundreds of assets to be inventoried per second.
Detaware is used by the largest banks, universities, and manufacturers in Turkey.
Matrix Warehouse - IoT Warehouse System
https://www.biltera.com.tr/A custom-designed IoT system consisting of RFID technology and sensors is installed on forklifts, and RFID tags are installed on warehouse addresses and goods. The systems on the forklifts communicate with a central system that aggregates all the data, process it, and integrates with ERP solutions like SAP.
Matrix Warehouse is used by more than ten factories of Şişecam in Turkey, Russia, and Europe.
Markarar - Product Barcode Scanning
Built an Android application with a cloud back end, allowing users to scan barcodes or search for products to retrieve detailed information, allergen warnings, and pricing across multiple supermarkets. Developed a distributed data aggregation system, leveraging user devices to continuously update product details while avoiding server-side limitations.
Conducted market research and feasibility analysis, evaluating adoption challenges and business potential. Ultimately, made a strategic decision to discontinue the project, considering scalability constraints and market conditions.
Google Matrix API Caching
https://www.prosymmetry.com/Migrated version control from SVN to Git, streamlining development workflows and improving collaboration efficiency. Focused on scalability, maintainability, and performance optimizations, ensuring long-term sustainability of critical systems.
Education
Master's Degree in Business Administration
Hacettepe University - Turkey
Bachelor's Degree in Computer Engineering
Çankaya University - Turkey
Skills
Libraries/APIs
Entity Framework, React, SignalR, Protobuf, Windows Forms (WinForms), Google API, Azure API Management, RxJS
Tools
RabbitMQ, Git, Azure App Service, Terraform, Azure Active Directory B2C (ADB2C), Azure Key Vault
Languages
C#, JavaScript, Java, HTML, SQL, TypeScript, C#.NET, Active Server Pages (ASP), VB
Frameworks
.NET Core, ASP.NET Core, Entity Framework Core, .NET, ASP.NET MVC, Windows Presentation Foundation (WPF), ASP.NET, Angular, VB.NET WinForms, Next.js
Platforms
Web, AWS Lambda, Amazon Web Services (AWS), Azure, Mobile, Android, Docker, Kubernetes, Azure Functions, Salesforce, Bluetooth Low Energy (LE), Firebase, Apache Kafka
Paradigms
REST, Microservices, Socket Programming, B2C, B2B, Agile, Microservices Architecture, Automated Testing, Unit Testing
Storage
Microsoft SQL Server, PostgreSQL, Amazon DynamoDB, JSON, PostgreSQL 10, SQL Server 2016, Microsoft Entra ID, Amazon S3 (AWS S3)
Other
Windows Services, Software Development, Computer Engineering, Business Administration, Architecture, SaaS Design, Team Management, Technical Leadership, Full-stack, RESTFul APIs, Software Architecture, Windows Communication Foundation (WCF), Finance, Entrepreneurship, HTTP, Serverless, Leadership, eCommerce, Project Leadership, Industrial Internet of Things (IIoT), Internet of Things (IoT), TCP/IP, Domain-driven Design (DDD), Salesforce Apex, Order Management, Low-level Reader Protocol (LLRP), UPC & Barcodes, RFID, Design, Optical Sensors, Product Management, Algorithms, Startups, PayPal, Payment Processing, Team Leadership, OOP Designs, Microsoft Azure, API Management, Azure Service Bus, Android Development, Market Research, Creative Problem Solving, Message Queues, Cryptography
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