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.

Cydar Medical (2025 to present) VP of Engineering

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

• 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.
• 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.
• Restructure of dev/QA team
  Re-organised dev and QA teams to better fit the company's changed needs and resources. Redundancies and hiring, functionally defined roles.

Cydar Medical (2022) Head of Engineering

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

• Docker compose system for Cydar 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

Cydar Medical (2017) Principal engineer

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
  Custom remote control for in-theatre use. Co-ordination of initial research, UX consultants, UI, hardware, comppliance and the development of embedded firmware for a LoRa RF USB remote. Long range, decade battery life. Deployed in US/EU.
• Edge Auto-update and process manager
  Auto-update system for deployment of edge-based software within the hospital. Minimal-downtime deployments and remote troubleshooting. Architecture 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 running Shibboleth, Microsoft ADFS / Azure and others. Work to prevent attack vectors. Penetration tested by NCC group

Cydar Medical (2014) Senior engineer

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

Broadcom (2013) Systems design engineer

Full SoC and PCI-E partition on Virtex 7 FPGA Clusters, 3x speed improvement to muxing hardware or emulation of SoC, dev of Cadence Palladium resource sharing system.

• 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.

Broadcom (2010, 2012) Year-in-industry + summer intern

Vertex 7 FPGA cluster bring-up with pattern checking HDL. CI testing system for new SoC. 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 (task tracker) and dsnet (VPN management).

References

Available on request only.