Hire the Best Software Design Freelancers
in Germany

Hi, I'm Zeljko 👋 I turn complex tasks into simple, functional and beautiful UI/UX ⭐️ Product Designer and problem solver with 9+ years in UI/UX design. Worked on B2C and B2B products, primarily mobile apps and SaaS. Passionate about turning complex challenges into simple, user-centric experiences from ideation and UX research through prototyping, to user testing, design implementation and beyond. My diverse portfolio includes successful projects for startups and Fortune 500s: Europcar, Volkswagen, Porsche and Romeo by Erasys. Berlin based freelancer, open to work as internal (remote or hybrid). Let me help you create exceptional user experiences ⚡️ Available for on-site work in Berlin.

Senior embedded software engineer with 10+ years shipping production firmware — from bare-metal MCU drivers to full RTOS architectures and Embedded Linux systems. I work on complex projects end-to-end: firmware design, build systems, testing infrastructure, and CI/CD. What I work on: ► Firmware development — C/C++ on ARM Cortex-M/R, FreeRTOS-based architectures, bare-metal drivers, hardware bring-up, OTA, secure boot, communication stacks (MQTT, CoAP, LwM2M, TLS, UART, SPI, I2C, CAN, BLE, LoRaWAN, LTE-M, NB-IoT) ► Embedded Linux — Buildroot, Yocto, Raspberry Pi, application and service development in C/C++, Python, Bash ► CMake & build systems — target-based architectures, cross-compilation toolchains, build optimization, migration from legacy Makefiles ► CI/CD for embedded — GitHub Actions, GitLab CI, Docker, hardware-in-the-loop testing, static analysis pipelines ► Safety-critical systems — SIL2 firmware, safety communication protocols (OSSD, FSI), deterministic state machines ► Audio & DSP — embedded audio pipelines, I2S/SAI, MIDI, OSC, real-time signal processing on MCUs Recent projects: • Lead firmware engineer, SIL2 human detection system — mmWave radar + thermal imaging, ARM Cortex-R5F/AM64x, FreeRTOS, C++17 (2025–2026) • IoT firmware, industrial container monitoring — ESP32, LoRaWAN, satellite comms, CAN bus, C++20 (2024) • Build system overhaul for a large C++/CMake video software codebase — reduced build times, modernized to target-based design (2024) • Embedded Linux video pipeline, professional cinema cameras — Xilinx VCU, H.265/HEVC, RTSP streaming, C++ (2023) Languages: C, C++, Python, Bash Safety-critical: SIL2, OSSD, deterministic state machines Embedded: FreeRTOS, bare-metal, ESP-IDF, Embedded Linux, Yocto, Buildroot Build systems: CMake, Ninja, Make, PlatformIO Toolchains: ARM GNU Toolchain, LLVM/Clang Protocols: MQTT, CoAP, LwM2M, RTSP, TLS, DTLS, CAN, FSI, RS485, I2C, SPI, UART, USB, NFC Wireless: BLE, LoRaWAN, NB-IoT, LTE-M, ZigBee Audio/DSP: I2S/SAI, MIDI, OSC Testing: Unity, Catch2, Google Test, Robot Framework CI/CD: GitHub Actions, GitLab CI, Docker Debugging: GDB, OpenOCD Hardware: STM32, ESP32, nRF52840, ARM Cortex-M/R/A, AM64x, Teensy, Raspberry Pi

I help startups and product teams turn complex ideas into clean, usable digital products. I’m a Senior Product Designer with 10+ years of experience designing SaaS platforms, mobile apps, dashboards, marketplaces, and web products. I can support the full product design process: UX research, user flows, wireframes, high-fidelity UI, interactive Figma prototypes, design systems, and developer-ready handoff. What I can help with: - UX/UI design for web and mobile apps - SaaS dashboards and B2B product interfaces - Figma prototypes, wireframes, and user flows - Design systems and component libraries - UX audits and product redesigns - Developer handoff with clear specs and interaction notes My design approach is practical: understand the product goal, simplify the user journey, create polished interfaces, and make sure the final design is easy for developers to build. If you need a product designer who can think through both user experience and visual execution, I’d be happy to help.

1. Product Design 2. User Experience Design 3. UI/UX Prototyping 4. SaaS Product Design 5. Design Systems 6. Figma 7. Wireframing 8. Prototyping 9. User Flow 10. Design & Usability Research 11. Interaction Design 12. Mobile App Design Portfolio: fazux.design I'm a Senior Product Designer based in Berlin with 8 years of experience and a Computer Science background — which means I can hold a design conversation and a technical one in the same breath. I've been the founding designer on products that went on to raise $25M (Boeing, Raytheon, Denso as backers), shipped AI-powered healthcare apps that had to be both human and WCAG-compliant, and taken e-commerce platforms from zero to deployment using AI-assisted workflows. The work spans complex B2B SaaS dashboards, multi-step consumer flows, design systems, and checkout UX — the kind of products where the details actually matter. What I bring to a project: – Turn ambiguous briefs into structured, shippable design systems – Design for complexity without hiding it: data-heavy interfaces, enterprise UX, multi-role flows – Work directly with founders and product leads, not just off a spec – Use AI tools (Figma AI, Claude Code) to move faster without losing quality I'm not a "nice screens" designer. I think about how a product earns trust, how it converts, and whether the design holds up when the team scales. If your product is more complicated than it looks on the surface — that's usually where I'm most useful.