RF hardware that fails on the first spin costs you weeks and thousands in respins. I design discrete RF chains, SDR pipelines, and multi-layer PCBs built to spec — right the first time. I design high-performance electronics, custom RF front-ends, and signal processing engines that work flawlessly in complex, noisy environments. From discrete GHz-range receiver design to complex system-level power topology and multi-layer PCB pre-layout architecture, I handle the engineering heavy lifting required to turn rigorous specifications into manufacturable assets. If your project involves software-defined radios (SDRs), tight EMI/EMC constraints, customized antenna matching networks, or high-sensitivity telemetry, I design the system-level architecture to ensure your hardware works on the first spin. CORE AREAS OF EXPERTISE 📡 RF & Wireless Systems Engineering • Discrete RF Chain Design (Antenna → LNA → Mixer → IF Filter → Demodulator) • Advanced RF Antenna Matching (LTE-M, NB-IoT, S-Band frequencies) • Component Selection & Impedance Matching (50 Ohm trace geometry control) • SDR Integration & IQ Signal Processing (Python, NumPy/SciPy, SoapySDR) 🔌 Hardware System Architecture & PCB Design • Full System Power Topology & Schematics (KiCad EDA) • Pre-Layout Optimization & High-Density Component Placement • Advanced EMI/EMC Mitigation Strategies & Strict RF Keep-Out Planning • Custom Footprint & Symbol Library Generation (fully localized & portable) • Design for Manufacturing (DFM) for automated Gerber, BOM, and Centroid extraction 🚀 SELECTED TRACK RECORD HIGHLIGHTS • Veytrax Long-Range RF Engine: Designed an urban digital radio monitoring platform utilizing an optimized Airspy SDR signal chain and an adaptive noise-floor DSP suite. Built a low-latency UI via CustomTkinter with webhook cloud telemetry. • Bifrost v2 Core Architecture: Architected a complex system and power topology from scratch, handling custom library engineering and critical pre-layout placement to isolate noise before trace routing. • S-Band Superheterodyne Receiver: Engineered a custom discrete FSK receiver at 2.225 GHz utilizing a VCO and PLL demodulator loop to escape congested 2.4 GHz bands. • Cellular IoT Antenna Tuning: Designed a 5-component matching topology for a space-constrained (38mm circular) nRF9151 device, optimizing TRP/TIS for global LTE-M and NB-IoT bands. 🛠️ TECH STACK • CAD & Simulation: KiCad EDA, Altium • Languages & Processing: Python, NumPy, SciPy, IQ Signal Processing • Hardware Platforms: SDRs (Airspy/HackRF), nRF9151, Discrete VCOs/PLLs • Wireless Standards: S-Band, LTE-M, NB-IoT, TETRA/P25, Custom FSK If you need a rigorous, system-level hardware engineer to design your core architecture, resolve interference bottlenecks, or optimize your RF front-end, let’s build a reliable system together. Click the 'Message' button to discuss your hardware specifications and milestone planning.

My job is to design functional and tested circuits and PCBs for your application or consult you, so you can do that your self. Just give me requirements for your circuit: the price for bill of materials, deadline and a list of required features. After a prototype of the device is designed, which I almost always advise, I will order few sample PCBs for testing. After testing and debugging is completed, I will ship them to you, so you can verify my testing results. This costs extra for you, but you are buying 100% working circuit design which needs no testing. Just take it and use it in your project. If you want to know how a circuit works I can develop complete math model of the circuit. This approach is way more accurate than SPICE simulation and allows you to understand how the circuit operates. I have completed at least one project having fallowing sub circuits: Analog: Low noise, low speed front-ends (from Hz to 100KHz): Photodiode, strain gauge, pressure sensitive resistors, magnetic angle sensors, tensile, thermocouples and other. High order active filters Voltage measurement (uV to kV) Current measurement (pA to tens of A) Resistance measurements (mOhm to Mohm) Frequency measurement (below GHz) Current output Oscillators (Bubba, Pierce, Hartley, phase shift, relaxation, crystal, RC) Integrated RF transmitters/receivers Digital: PCIe USB HDMI I2S SPI High speed parallel interfaces Logic circuits (TTL, CMOS) SOCs Power: DC/DC converters: Buck, Boost, SEPIC, full bridge, Cuk, Linear AC/DC converters (up to 1.8kW) Brushless and brushed motor drivers TEC drivers CAD packages: DipTrace KiCad Altium I have fallowing equipment: 1x Osciloscope RTB2004 4 channel 10 bit 300MHz with logic analyzer having 16 differential channels up to 600Mbps. 1x Oscilloscope HMO1002 2 channel 8 bit 50MHz. 1x Multimeter HMC8012 5,75digit 1x Electronic load IT8616 1.8kVA 420VAC 20AC (60A peak) or 600VDC 20ADC with AC signal analysis 1x Electronic load IT8512C 120VDC 60ADC 1x Signal generator Rohde and Schwarz AFG 20MHz 1x TP3020 30V 20A linear power supply 1x HY5003-2 dual channel 50V 3A linear power supply 2x PeakTech 6080A 15V 3A power supply 1x VP-2000VA - 2kVA 230VAC to 120VAC converter. 1x DER-EE DE-5000 RLC meter I also have programmer for: Texas Instruments CC series, Texas Instruments MSP430 programmer, Microchip ICD3/PicKit2/AVR ISP USBasp, Segger ARM programmer, SiliconLabs 8051 core programmer

👋 I am a Certified Multicloud DevOps Engineer, Cloud Engineer, SRE, and Platform Engineer with 15+ years of experience designing, deploying, and managing secure, scalable infrastructure for enterprises, startups, and regulated industries like finance, healthcare, and e-commerce 🔥 WHY HIRE ME AS A DEVOPS ENGINEER? - 15+ years of hands-on experience as a Multicloud DevOps Engineer, Cloud Engineer, SRE and Platform Engineer - 300+ projects delivered for 200+ clients across finance, healthcare, e-commerce and startups - 17 completed Upwork contracts, 90% Job Success, 753+ hours, $30K+ earned on this platform alone - Cut deployment times by 82% through custom CI/CD automation across hybrid-cloud environments - 99.99% uptime achieved, cloud spend cut by 37% via optimized Kubernetes autoscaling (EKS/AKS/GKE) - Led a cloud transformation saving $2M+ annually, accelerating delivery 5x - Zero-downtime releases with 10x faster rollouts (Jenkins, GitLab CI, GitHub Actions, Argo CD) - MTTR improved by 42% via centralized observability (Grafana, Prometheus, ELK, Datadog) - 200+ sites migrated with zero downtime, 500+ nodes patched and hardened - Latency reduced by 52% via reverse proxy caching and CDN integration - 10+ professional certifications: AWS DevOps Engineer Professional, GCP Cloud Architect, Azure Solutions Architect Expert, and more 💪💪 SKILLS & ACHIEVEMENTS 👉 Programming Languages Applied across automation, infrastructure workflows, and backend integrations in enterprise CI/CD pipelines: Bash, Python, YAML, PowerShell – scripting and orchestration of distributed systems. Golang, TypeScript, JavaScript – building CLI utilities, microservices, and dashboards. SQL – database scripting and performance optimization for PostgreSQL, MySQL. Key Result: Cut deployment times by 82% through custom automation scripts across hybrid-cloud environments. 👉 Infrastructure as Code (IaC) Delivered multi-cloud infrastructure for Fortune 500 organizations: Terraform, Ansible, Puppet, AWS CloudFormation, AWS SAM, ARM Templates. Key Result: Achieved full disaster recovery readiness and cross-region scalability with Terraform and Ansible. 👉 Containerization and Orchestration Implemented microservices at scale via Kubernetes (EKS, AKS, GKE): Docker, Kubernetes (all providers), OpenShift, Azure Service Fabric. Key Result: Reached 99.99% uptime and reduced cloud spend by 37% through optimized autoscaling strategies. 👉 Cloud Platforms and Services Architected and secured global hybrid-cloud infrastructures: AWS (core focus): enterprise-grade deployments for healthcare, finance, retail. Azure: DevOps pipeline integrations with AD. GCP: Implemented GKE and BigQuery for large-scale data solutions. Key Result: Led a cloud transformation cutting costs by $2M+ annually and accelerating delivery 5x. 👉 DevOps Tools and Practices Engineered CI/CD pipelines, GitOps workflows, and release automation: Jenkins, GitLab CI, GitHub Actions, Bitbucket Pipelines, Argo CD, Octopus Deploy. Key Result: Delivered zero-downtime deployments and enabled 10x faster production rollouts. 👉 Monitoring and Observability Built end-to-end observability stacks: Grafana, Prometheus, ELK, Datadog, Zabbix, CloudWatch. Key Result: Improved MTTR by 42% through central log management, alerting, and tracing. 👉 Databases and Storage Engineered high-availability and cloud-native database solutions: MySQL, PostgreSQL, MongoDB, DynamoDB, Redis, Cassandra. Key Result: Migrated legacy DBs with zero data loss and achieved 62% performance uplift. 👉 Operating Systems & SysAdmin Large-scale administration of Unix/Linux systems: Ubuntu, CentOS, Debian, Cloud Linux, Windows Server. Key Result: Automated patching across 500+ nodes and hardened OS security to CIS standards. 👉 System Administration & Hosting Maintained enterprise-scale hosting platforms: cPanel, WHM, Cyberpanel, Plesk, HAProxy, Email Servers. Key Result: Migrated 200+ sites with no downtime, tripling load-balancer efficiency. 👉 Web Servers & Application Platforms Scaled and optimized business-critical applications: Apache, Nginx, Tomcat, WebSphere, JBoss. Key Result: Reduced latency by 52% via reverse proxy caching and CDN integration. 👉 Frameworks & Libraries Supported DevOps workflows as a Full Stack Developer: React, Angular, Next.js, Spring Boot, GraphQL. Key Result: Delivered CI pipelines for frontends and serverless backend deployments. 👉 DevOps Engineer - Security & Authentication Secured regulated infrastructures (PCI, HIPAA): Keycloak, Azure, Cognito, OKTA, Firewalls, Fail2ban. Key Result: Built centralized SSO and conducted security audits with advanced threat modeling. 📩 Want to take your cloud infrastructure to the next level? Send me a message — and together we'll turn your vision into reality.

RF & Microwave Engineer | RF Design, Calibration & Automated Testing RF & Microwave Engineer with strong hands-on experience spanning RF design, electromagnetic simulation, and calibration-grade RF testing of high-frequency systems. I specialize in bridging theory, simulation, and real-world measurements to deliver accurate, repeatable, and production-ready RF solutions. 🔹 RF Design & Simulation Electromagnetic design and optimization of RF cavities, waveguides, coupling structures, antennas, and passive RF components S-parameter–driven design validation using CST Microwave Studio, HFSS, and Keysight ADS Mode analysis, impedance matching, coupling control, and EM-to-measurement correlation 🔹 RF Testing & Calibration End-to-end RF verification and calibration of signal generators, spectrum analyzers, VNAs, and power sensors Measurements covering output power accuracy, phase noise, harmonics & spurs, TOI, VSWR, frequency & level settling time Digital modulation analysis including QAM/QPSK, EVM, ACLR, and spectral regrowth 🔹 Test Automation & Productivity Automation of RF measurements using Python/SCPI, HP/Agilent/Keysight VEE Pro, and NI LabVIEW Development of repeatable test frameworks reducing manual test time by 50–70% Clean, documented workflows suitable for R&D validation, production testing, and calibration environments I can support projects from RF design and simulation through lab testing, calibration, and automated verification, ensuring your RF system meets performance, accuracy, and compliance requirements.

An experienced software developer/architect/product development manager with over 15 years of solid experience in developing advanced and secure networking software for routers, switches, firewalls, servers, IoT devices/gateways and network appliances. Possesses deep working knowledge in IPv6, routing protocols, operating system, firewall, client-server application, management protocols and applications. Very proficient in C, C++, Perl, Unix scripting, modular and OOP programming, client-server and has advanced working skills in PHP, Ruby/Rails, Java, SQL, non-SQL and Web technologies. Mainly used FreeBSD and Linux in all projects. Heavily involved in all phases of development, from conceptualization, requirement specification making, designing, implementation, testing and maintenance. I am seeking opportunities to design and develop network appliances, IoT devices and embedded systems from the ground up, migrate networking applications to incorporate secure technologies and run on IPv4 and IPv6 and build intuitive and secure websites or web-based management interfaces. I am also seeking consulting services in product development, management, QA and coaching as well as design, deployment, pen-testing and monitoring of networking and security services and infrastructures. Summary of competencies and skills - System/network/security administration using open source and commercial solutions such as pfSense, OPNsense, BIND/DHCP/DNS, Freeswitch/Asterisk/SIP/VoIP, Sophos, Sonicwall, OpenWrt, ELK Stack, Grafana/Prometheus, Zabbix, Nagios, SNMP, OpenVPN, IPsec, Wireguard, HAProxy, MongoDB, MySQL/PostgreSQL, Redis, Nginx, Apache, Squid, Snort, OpenStack, Radius, OpenLDAP, Ceph, RabbitMQ, Kali Linux, Connectwise Manage, Connectwise RMM, Connectwise Perch, Bitdefender, WebRoot, Auvik, MQTT - IoT, LoraWAN, Chirpstack, Sensors, Rasp PI integration/interfacing, BACnet, BMS - Unix and Linux system, security, and network administration and dual-stack network/sockets programming - System/Application programming with C/C++, PHP, Ruby, Perl and Shell scripting. - Cloud computing and networking on AWS, IONOS and Digital Ocean environments - Virtualization with Proxmox, ESXi, vSphere, and KVM - Containerization using Dockers - Project management in various methodologies such as Extreme programming, Agile, Iterative, Waterfall, Prototyping, and Scrum - Software and hardware product development covering all phases of product life cycle - Secure networking software development for routers, switches, and network appliances in IPv4 and IPv6 network stacks - Software testing automation and Continuous Integration (CI) using Gitlab/Github, Jenkins, Robot Framework, Selenium - Risk assessment, Penetration testing, Disaster Recovery, Compliance and Interoperability testing, Performance and Capacity testing and High Availability deployment, management - Web Services, Application and network design, deployment, monitoring, and management - Managed Services Provider support and deployment, Connectwise suite(Manage, RMM, Perch), Bitdefender, Webroot, Auvik - Asset management, Document and Source Code control - Human resource training, career and life coaching

Software Engineer, 16 years of experience within the IT Industry working as programmer, tester and Project Leader. Highly skilled in C/C++ but all around guy when the situation requires to (python, nodejs, mySQL, c#, Java, Webservices, PHP, CSS, signalling protocols, embedded software... and a long list after so many years !!!!). Always learning, in this world you can never stop learning, reading, tasting and also exasperating... (it is part of the task) Programming fan, pragmatic and methodical... XP (Extreme Programming) follower. Software quality and client satisfaction are my first two goals (money is the third, of course :-)). Software is my work, my hobby and my life!!

Highly motivated Electronic and Telecommunication Engineer driven by a deep passion for robotics, machine learning, and innovation. Eager to contribute to cutting-edge advancements and explore emerging technologies across diverse fields, with a focus on developing impactful solutions in robotics, automation, and intelligent systems. Open to opportunities that align with my enthusiasm for research, innovation, problem solving and creating meaningful contributions to technology and society.

Hi, my name is Arsen. I’m a Senior C++ and Python developer with 5+ years of experience building software for Linux, Windows, and embedded systems. I focus on clean, efficient, and reliable solutions for low level, backend, and performance critical tasks. What I bring to projects: • C/C++ development: STL, Boost, Boost ASIO, Qt, WinAPI, OCCI, V8, POSIX, multithreading • Python development: automation tools, data pipelines, backend logic, Django • Database engineering: Oracle, SQLite, MongoDB, data export tools, batch processing, custom type conversion • Linux systems programming: networking utilities, driver level interaction, Linux kernel headers, OpenWRT, desktop and CLI tools • Wireless and low level networking: Generic Netlink, nl80211, libnl/libmnl, Wi Fi scanning tools, protocol and frame parsing • Reliability and performance: profiling, transactional workflows, data integrity focused design, Dockerized builds, CI/CD with TeamCity • Cross platform delivery: Linux and Windows applications, Make, CMake, Conan, Git/SVN, GDB, Valgrind, Doxygen, Bash I have built tools ranging from high performance Wi Fi scanners in C that interact directly with the Linux wireless stack, to cross platform C++ command line utilities that export Oracle data into SQLite with transactional safety and performance profiling. I am comfortable working close to the system, optimizing throughput, handling large datasets, and designing software that is maintainable and stable in production. Clients usually trust me with complex backend, systems, and infrastructure related tasks where performance, correctness, and long term reliability matter. If you are looking for a developer who can work on C++, Python, Linux internals, networking, or data heavy applications, let’s talk. 🙂

I graduated from the electronic engineering department of Istanbul Technical University, the most respected university in Turkey, and then I gave my master's thesis at the same university. I worked as an engineer and manager in companies operating in the field of telecommunications and energy for many years. I am currently retired I am an expert on analog and digital electronic circuits including ESP32 embedded controllers and FPGA and PCB development (with Eagle and KiCad) more specifically I have various design works at Aurduino and ESP32 boards. I am also make some design and developments for wireless IoT products. Beside of these, I can prepare a master's thesis in electronics engineering and telecommunications, especially I specialize in wireless communication. With my extensive analog and digital engineering including FPGA programming at VHDL knowledge and especially my knowledge and experience in the workings of all kinds of electronic components, I am an expert in cost reduction or finding alternative sources instead of obsolescent components. This experience can also support me in reverse engineering.. I have also made software with many programming languages, you can find some of these languages ​​in the list below; - C++ - Python - HTML -Javascript -CSS -VHDL (for FPGA programming) Having worked in supply management for many years, I have expertise in the preparation of purchasing and supply contracts, letters of intent, and privacy policy information texts. I have extensive experience in their preparation.

I have a background in electrical and electronics engineering and I have extensive skills in Simulation and programming. I have had vast experience in the creation, configuration, and maintenance of both Software and Hardware. I am industrious and I have a key focus on both the quality and timeliness of my work and the work that I deliver. I always try and maintain high working standards as well as a good work ethic. Having been a freelancer for more than 6 years I have had the opportunity to take on a wide spectrum of projects, which have challenged me and I have grown through that. I take a lot of pride in all the clients I have had the chance to work with. My specialty lies in : 1. ✅Signals and systems. Having worked at a telecommunication company I was able to gain skills in power systems and the various processes that come into play when it comes to long-term work and actual implementation of communication equipment. From setting up BTS(Base Transceiver stations) to the gradual rolling out of fiber optic cable to enhance internet connectivity. 2. ✅Machine learning and Data analytics: Mostly based on Matlab and Google's tensor flow. I have worked on real-world problems and I have worked with various datasets, which all aim to derive useful information and unearth patterns aimed at improving the end result and getting solutions to existing problems. 3. ✅Embedded systems and hardware architecture. Having had a solid background in electrical and electronics engineering, I especially loved digital systems logic and digital signal processes. And through that, I have learned how to operate FPGAs(Field Programmable Gate Arrays) and I am proficient in VHDL (Very High Speed integrated circuit Hardware Description Language). Through Matlab, I am able to successfully design and come up with the VHDL code to support a customized hardware design with a turnaround time of 7 days. 4. ✅ MATLAB and Simulink simulations. As an engineer, Matlab has been crucial in successfully designing systems and verifying principles as well as carrying out research. I have worked on a wide range of projects ranging from Power systems design to control systems and even digital signal processing among others. Both in the academic and in industrial automation Matlab has been remarkably powerful and ideal. Why am I a good fit for your project? Having worked with a wide range of clients and has been on the platform long enough I have gained not just a wealth of experience I am also confidence and very professional in the quality of work delivered. This is evident based on my reviews from the clients I have had the pleasure of working with along with my JSS score. I am a good communicator and I believe having a great working relationship with my clients starts with being a good communicator.