TensorHost infrastructure.
CTO & Founding Engineer since December 2025. I built RKE2 infrastructure, internal services and a dynamic pricing engine for Vast.ai GPU rentals.
[ SYSTEMS ] / [ INFRA ] / [ COMPILERS ]
RAPHAEL
SINAI.
> I build firmware, PCBs and infrastructure █
I'm Raphael, a third-year Electronic and Information Engineering student at Imperial College London. I work on embedded systems, robotics and the infrastructure that connects them.
CTO & Founding Engineer at TensorHost. Volunteer President of ICRS and EESoc.
// 01
NOW.
UPDATED 27 OCT 2026MEng Electronic and Information Engineering.
Third year at Imperial College London, graduating June 2028. Currently averaging a First and on track for First Class Honours.
Leading ICRS and EESoc.
President of both societies since August 2026. Lab access, equipment, society software, careers events and collaborations.
An RV64 operating system.
RISC-V operating system using QEMU and OpenSBI, and a custom server KVM using PiKVM and RP2040. Both in development.
// A
ABOUT.
I'm studying for an MEng in Electronic and Information Engineering at Imperial College London, September 2024–June 2028.
I most enjoy deciding how a system should work, then building the firmware, communications and electronics to make it happen. My projects range from ESP32 controllers and custom KiCad PCBs to robot integration, a C-to-RISC-V compiler and Kubernetes infrastructure.
At TensorHost I built the supporting infrastructure and internal services for a GPU-hosting business. Alongside my degree, I volunteer as President of Imperial College Robotics Society and EESoc.
My favourite recent courses have been Instruction Architectures and Compilers and Software Systems, especially the coursework: building a compiler in C++, and a shell and concurrent chat application in C.
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WORKS.
FEATURED 06◉
EMBEDDED · 2026LORA GARAGE CONTROLLER
ESP32, custom KiCad PCBs, encrypted LoRa communication and Home Assistant integration via MQTT.
→ READ THE LOG┌─┬─┐
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HARDWARE · 2025→│◆│●│
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ROBOTICS LAB ACCESS
Custom NFC readers, FreeRTOS firmware, OrcaSlicer backend permissions and lab networking.
→ READ THE LOG▌▌▌▌▌
INFRA · 2025→TENSORHOST INFRASTRUCTURE
RKE2, SSO, monitoring, CI/CD, internal services and GPU dynamic pricing.
→ READ THE LOGC → RV64
COMPILERS · 2026C TO RISC-V COMPILER
Co-developed in C++ and passed 93% of unseen ANSI C tests.
→ READ THE LOG◇
ROBOTICS · 2026SELF BALANCING WAITER ROBOT
Raspberry Pi 3B, ESP32, LiDAR, PID control and ZeroMQ integration.
→ READ THE LOG▸ QR ▸
WEB · 2026EESOC MEMBER SERVICES
Live ticketing, QR check-in, passkeys and student-submitted opportunities.
→ READ THE LOG// 02A
PROJECTS.
LoRa garage controller
I designed two ESP32 nodes and custom KiCad PCBs. The radio link uses AES-CTR, the home node communicates with Home Assistant over MQTT, and a distance sensor reports garage-door closure. I developed the ESP-IDF / FreeRTOS firmware and integrated button-terminal control.
ESP32 · ESP-IDF · FREERTOS · KICAD · LORA · AES-CTR · MQTTRobotics lab NFC access
I replaced hard-coded OrcaSlicer verification checks with backend-managed print permissions. I designed and tested custom NFC-reader PCBs, developed C++ / FreeRTOS firmware and addressed router reliability using OpenWrt on Proxmox.
C++ · FREERTOS · KICAD · NFC · ORCASLICER · FASTAPI · OPENWRTTensorHost infrastructure
I built RKE2 infrastructure, SSO, access controls, monitoring, telemetry, documentation, wiki, storage and document sharing. I configured versioned container publishing, deployment-manifest updates and pull-request checks, and built a dynamic Vast.ai GPU-pricing engine.
TENSORHOST →C to RISC-V compiler
I co-developed a compiler from C to RISC-V in C++ with a teammate. It passed 93% of unseen ANSI C tests. My work included nested structures and multidimensional arrays.
C++ · C · RISC-V · COMPILERSSelf balancing waiter robot
I integrated Raspberry Pi 3B, ESP32 and LDROBOT LiDAR components. I contributed to PID control, LiDAR sensing and ZeroMQ communication. The wider team also used A* pathfinding.
RASPBERRY PI · ESP32 · LIDAR · PID · ZEROMQWebsite and member services
I revamped EESoc's website, personally developed ticketing, QR check-in and passkey sign-in, and built the student opportunities submission, approval, publication and email workflow.
EESOC WEBSITE →Ender 3 V2 PCB mill
I converted an Ender 3 V2 into a PCB mill using a mount for a Dremel flex shaft, reusing its motion system and sending G-code over UART.
Wearable braille reader
Our team was runner-up for the Anthropic prize. I built the Raspberry Pi camera subsystem, camera logic and 3D-printed wearable hardware.
C shell and concurrent chat
I built a shell and socket-based concurrent chat application in C, including groups. I received 80% for the coursework.
AM-to-UART debugging
I debugged false-positive and false-negative detections using an oscilloscope, adjusting the comparator threshold and envelope detection.
Engraved coin awards
I designed and fabricated 700 engraved coin awards with clear cases.
RV64 operating system
I'm developing a RISC-V operating system targeting RV64 using QEMU and OpenSBI.
Custom server KVM
I'm developing a custom server KVM using PiKVM and RP2040, combining hardware control with remote access.
// 02B
LEADERSHIP.
VOLUNTEER ROLESPresident · Robotics Society
I wrote seven risk assessments and created the machine-competency framework, arranged independent lab access and maintained equipment and infrastructure.
President · EESoc
I organised a careers fair with 10 companies across five rooms, developed the website and services, and increased sponsor-event attendance and society income.
Head · Planetary Robotics Lab
I contributed to UAV autonomy software, then led rover and UAV work, increasing funding and recruitment and reorganising the team.
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LOG.
NEWEST FIRST- Became President of ICRS and EESoc.
- Built a LoRa garage controller and PCB mill.
- Integrated a self-balancing waiter robot.
- Co-developed a C-to-RISC-V compiler, 93% on unseen tests.
- Fabricated 700 awards for IC Hack.
- Started as CTO & Founding Engineer at TensorHost.
- Started volunteer leadership of IPRL.
- Debugged an AM-to-UART circuit.
- Worked on lab NFC access.
- Built wearable braille-reader hardware.
- Started MEng EIE at Imperial.
// 04
STACK.
- C · C++
- ESP32 · ESP-IDF
- FreeRTOS
- Raspberry Pi
- Firmware
- KiCad · PCB design
- Oscilloscope
- Signal generator
- Multimeter
- 3D printing
- I²C · SPI · UART
- LoRa · MQTT
- ZeroMQ · Sockets
- System integration
- Kubernetes · RKE2
- Proxmox · OpenWrt
- CI/CD · SSO
- Monitoring · telemetry
- RISC-V · concurrency
// 05
SIGNAL.
LONDON · OPEN TO PLACEMENTSI'm looking for a six-month engineering placement, April–September 2027, particularly in firmware, embedded systems, robotics and infrastructure. I'm interested in coding, hands-on electronics and system integration.