Callan Bryant MEng

VP of Engineering at Cydar, a medical imaging technology company. Accomplished technical leader and engineer with over 10 years of experience delivering complex software in regulated healthcare environments where safety, reliability and security are paramount.

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You may want to take a look at my about page and technical blog. This CV is also available as a PDF.

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About me

Career highlights

From embedded code to systems design and leadership; I thrive leading teams, building something world-changing. I'm motivated by interesting problems and working with talented people -- staying hands-on with coding, architecture and design.

Leading the engineering team/process and QA strategy, successfully driving the technical strategy of the company through a re-org. Product ownership + technical leadership, recruitment & team growth. Dev work. Setting OKRs/KPIs.

• Automation of release process
  Using python to connect Jira, Testlodge and Github Actions APIs to automate traceability for security scanning & triage, test evidence and requirements, and compile regulatory release doc saving a week of work monthly and decreasing risk of human error.
• Delivery of buildroot based linux endpoint OS
  Architecture + delivery of buildroot-based highly available & secure ephemeral linux OS for edge deployments environments.
• Overhaul of dev, QA and traceability process
  Implemented new Scrum/Agile DevOps process to improve collaboration and increase efficiency between dev and QA teams. Reduced time spent re-working by 30%.
• Restructure of dev/QA team
  Re-org of dev and QA teams to fit the company's changed needs and resources. Redundancies and hiring, functionally defined roles. A turn-around to an effective, motivated team.

Leading and growing the team. Improvement of the product & processes. Driving value to achieve business goals and ROI.

• Automatic Volume Assessment system
  Project management of an AI-based automatic aortic aneurysm volume assessment system used in around 100 sites.
• Reduction of QA cost
  Reducing QA head count from 8 to 3 without sacrificing quality or safety, focusing on improving requirements traceability, test automation and process improvement.
• Containerisation of cloud
  Docker compose based system to allow quicker QA, development and operation of part of the the Cydar cloud system.
• CT follow-up transfer system
  Tech. architecture and project manangement for a batch based auto follow-up CT scan transfer system. Used with 10,000+ CT scans across 50 sites enable end-to-end patient care. Python/typescript.
• Surgery planning tool
  Project management and delivery of an improved planning tool for use with Cydar Maps

Project & team leadership, development of high-profile Cydar cloud components necessary to bring Cydar EV to the operating theatre with a good user experience. Team leadership plus larger project groups.

• In-theatre remote control
  Remote control for in-theatre use. Co-ordination of research, UX consultants, UI, hardware, compliance and the development of embedded firmware for a LoRa RF USB remote. Long range, decade battery life. Deployed in US/EU, 100 sites zero issues. Users no longer use touchscreens. Embedded C, Electronics. ATMega, LoRa.
• Edge Auto-update and process manager
  Auto-update system for monitoring & deployment of edge-based software within the hospial. Code audited by NCC group. 100's of installs each with 100's of updates -- 0 failures. Python, GRPC.
• Deformation adjustment feature
  Project leadership of an anatomy adjustment tool. Team of 8 engineers to co-ordinate and prioritise work and deliver for commercial uplift.
• SAML2 single-sign-on SP implementation
  Implementation of a python/django based secure SAML2 SP enabling integration with hospital SSO for Microsoft ADFS / Azure etx. Penetration tested by NCC group

Bringing the prototype Cydar system to clinical usefulness and market.

• PACS DICOM / web gateway
  Edge-deployed gateway for query & retrieval of CT scans (DICOM) from hospital PACS. Strong concurrency/queuing model with real-time progress and update mechanism. In use since 2017 in 80+ hospitals
• Django secure patient data portal
  In use since 2014 to manage patient data across our products
• Distributed content addressable object store
  Built upon S3 and Redis for low-latency, reliable data access. Intrinsic automatic de-duplication and integrity guarantees. Critical for Cydar's patient data and pipeline
• Distributed GPU compute system
  Improved Cydar's 2D-3D image registration performance to make it clinically useful, design of a low-latency work-distribution system using Redis to reduce compute time from 50 seconds to 5

FPGA-based & PCB hardware design for video SoC validation and test systems.

• Muxing hardware in FPGA cluster
  Developed a new system involving source-synchronous clocking. The new design was capable of 4.5x SoC core clock improvement decreasing costs and increasing productivity 2x
• Stereoscopic camera development add-on board
  2 daughtercard designs for a dev kit to interface 2x CSI cameras with shared clock and auto-stereoscopic 3D display without datasheets available.

Vertex 7 FPGA cluster bring-up with pattern checking HDL. Dev board design, stereoscopic camera add-on, automated testing system, lab + budget management, technical duties.

Skills & Technologies

From low-level embedded C to high-level Python and Javascript I have a range of skills. I have experience in many areas of engineering, including software, hardware, DevOps and process improvement. I am a quick learner and enjoy finding the right solution to a problem.

Education & Qualifications

Hobbies & Interests

I design and build things – electronics, software, woodworking and 3D printing. I blog my adventures on https://calbryant.uk/. In my spare time I also run, cycle and sometimes kayak. I created and maintain 2 successful open source projects: dstask (a task tracker) and dsnet (a VPN manager)