Master of Technology in Electronics & Communication Engineering
Institute of Engineering and Management, Kolkata
2017 — 2019CGPA 8.72
// firmware.engineer
Tamojit Saha
- Senior Firmware Engineer
- Embedded Systems Architect
- IoT & Connectivity Specialist
>
I design production-grade embedded systems, firmware, IoT platforms, wireless communication stacks, bootloaders, RTOS architectures and edge devices.
// about
Engineering production-grade embedded systems
I design production-grade embedded systems, firmware, IoT platforms, wireless communication stacks, bootloaders, RTOS architectures and edge devices. For me, firmware is where ambition meets physics: every byte, every interrupt and every milliamp has to earn its place before a device ever reaches the field.
Across smart metering, GPS-synchronized railway timing, industrial IoT and low-power wearables, I've spent years shipping firmware that simply has to keep running, on constrained MCUs, over flaky wireless links and through brown-outs that would corrupt lesser systems. That experience has made me obsessive about low-level reliability: deterministic RTOS task design, resilient OTA pipelines, journaled persistence and radio stacks that coexist without dropping a packet.
I work most happily close to the metal, BLE and cellular connectivity, bootloaders, sensor fusion and the kind of power-aware architecture that turns a prototype into a product. The goal is always the same: build embedded systems that are quietly, boringly dependable for years after deployment.
- Iskraemeco India
Senior Firmware Engineer
Aug 2023 — Present
- Applied Electro Magnetics
R&D Application Engineer / Firmware Engineer
Nov 2022 — Aug 2023
- Lazot Technologies
Embedded Systems Engineer
May 2021 — Oct 2022
- Achilles Resolute
Embedded Systems Engineer
Jan 2020 — May 2021
- Icosys Technologies
Embedded Systems Engineer
Mar 2019 — Jan 2020
// tech stack
The full embedded stack
// proficiency map
Firmware
C95%
C++88%
Python82%
RTOS
FreeRTOS90%
OpenCPU RTOS85%
MCUs
STM3293%
nRF5288%
ESP3290%
RP204080%
MSPM075%
AVR85%
Protocols
BLE92%
GSM85%
LTE84%
MQTT88%
UART95%
SPI93%
I2C93%
RS48587%
GPS84%
LoRa80%
// experience
Where I've shipped firmware
// responsibilities
- Engineered BLE and cellular NIC firmware for smart meters on Nordic nRF52, Silicon Labs EFR32BG22, and OpenCPU cellular modems driven over AT-command interfaces.
- Designed checksum-based error detection and retransmission in custom bootloaders to ensure reliable over-the-air firmware delivery.
- Designed and implemented differential FOTA logic to upgrade cellular-modem firmware efficiently.
- Improved firmware resilience during power-interruption scenarios using interrupt-driven event handling and hardware timers.
- Contributed to OpenCPU modem firmware development: RTOS task scheduling, memory management, synchronization, and resource optimization.
// technologies
CC++Nordic nRF52Silicon Labs EFR32BG22OpenCPUBLECellular (LTE/GSM)FOTA/OTABootloadersRTOS
// impact
-50%
OTA/FOTA upgrade duration
+33%
Power-interruption resilience
Differential FOTA
Modem firmware updates
// education
Education
Bachelor of Technology in Electronics & Communication Engineering
Techno India University, Kolkata
2013 — 2017CGPA 8.63
// projects
Selected engineering work
Smart Meter BLE NIC
BLE + cellular Network Interface Card for utility smart meters with secure OTA.
BLECellularOpenCPUOTASTM32
Railway GPS Clock System
GPS-synchronized master clock distributing precise time across railway platforms.
EthernetGPSStepper ControlSTM32
E-Paper Price Tag Platform
ESP32 electronic shelf labels with a web UI and Google Sheets sync.
ESP32Web UIGoogle SheetsE-Paper
Industrial Multi-Sensor Hub
RTOS-driven gateway fusing multiple industrial sensors to the cloud over MQTT.
RTOSSensor FusionMQTTSTM32
Wearable Safety Device
Body-worn device with IMU, heart-rate, SpO2 sensing and haptic alerts.
IMUHeart RateSpO2HapticsnRF52
// open hardware
Open Hardware & PCB Designs
Published board designs and electronics — explore the full collection on my profiles.
OSHWLab
STUSB4500 USB-C PD Sink
USB-C Power Delivery sink board around the STUSB4500 — negotiates higher-voltage PD profiles from USB-C sources autonomously, no MCU required.
USB-CPower DeliverySTUSB4500PCB
Hackaday
Thermocouple Amplifier for Arduino & MCUs
Thermocouple amplifier breakout for interfacing thermocouples with any microcontroller — built around the LTC2053 zero-drift instrumentation amp with LT1025 cold-junction compensation.
LTC2053LT1025Cold-JunctionInstrumentation AmpPCB
OSH Park
µStick — ATSAMD11 Micro Dev Board
Tiny (39×15 mm) Arduino-compatible dev board on the ATSAMD11C14 Arm Cortex-M0+, designed for battery-powered projects: configurable Li-ion charging up to 1.6 A, low-dropout power management and double-tap bootloader entry. Released CC-BY-SA 4.0.
ATSAMD11Cortex-M0+Battery / LiPoArduinoPCB
// embedded playground
Embedded Playground
These are live, interactive engineering demos — not screenshots. Each one runs real protocol logic in your browser: framed UART traffic, a priority-preemptive RTOS scheduler, BLE advertising/GATT, and a dual-bank OTA state machine.
Want real hardware? Open the Web Serial TerminalConnect an actual UART/serial device from your browser (Chromium, HTTPS).UART Terminal
Type text or hex bytes, transmit over a virtual serial line, and watch a deterministic device echo back. Each line is framed with a start byte, length and XOR checksum.
Est. line time @ 115200 baud: 173.6 us (2 bytes x 10 bits)
Console TX RX
// no traffic yet — send a frame
Parsed frames — [STX] [LEN] [PAYLOAD...] [XOR-CKSUM]
// framing appears here
// publications
Research & Publications
Precision Thermocouple Amplifier for substrate temperature monitoring in an ECR-PE nano-film deposition system
Aditya Mukherjee, Tamojit Saha
IEEE/2018
Chaotic Cipher Based Spatial Domain Steganography with Strong Resistance Against Statistical Attacks
Tamojit Saha, Sandeepan Sengupta and Tanmoy Dasgupta
IEEE/2017
// achievements
Awards & Recognition
- 2018Membership
Associate Member
Membership No. AM1813504, The Institute of Engineers.
- 2016Award
Best Project
National Science Day Exhibition 2016, Science Association of Bengal.
- 2016Award
2nd Place — Electronically Yours
On-spot electronic design contest, Edge X 2016 Technology Convention, Techno India College, Salt-Lake (TISL).
- 2015Award
2nd Place — Contrive
On-spot electronic design contest, Avenir 2015 Technology Convention, Netaji Subhash Engineering College, Kolkata.
- 2015Award
Winner — Electronically Yours
On-spot electronic design contest, Edge 2015 Technology Convention, Techno India College, Salt-Lake (TISL).
// contact
Let's build something reliable
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