What we found, what we did and where it stands, in client work and in our own product. Further down, earlier work Daryn led before founding Tesserium.
Each status checked in the last 90 days
Care management
US value-based care
Year:
Status checked
Medication reviews with pharmacist sign-off, inside the care platform
Situation
A US value-based care organisation wanted its care managers to run comprehensive medication reviews with patients who take several long-term medicines, and a clinical pharmacist to sign off every review.
Finding
The review spans 2 roles with different needs. Care managers need a structured form they can complete while on the phone with the patient. The pharmacist needs the whole patient chart, a queue of reviews waiting for sign-off, and a record of who approved each one.
What we changed
We designed a medication review workflow for care managers and an approvals queue for a new clinical pharmacist role with full chart access, then led the build with the client's development partner. Each review records who completed it and who signed it off. Before release we reviewed the requirements, tests and user guide from clinical, product and engineering angles.
Status
Live since September 2026.
How a review gets signed off
A care manager completes the review with the patient. A clinical pharmacist, never the same person, signs it off.
Care managerClinical pharmacist
Care manager
In progress
Completes the review with the patient, section by section.
Platform Saves it as a draft until it is submitted.
Clinical pharmacist
Submitted
Reviews it against the full patient chart.
Platform Locks it, and never lets the person who completed it sign it off.
Returned
The pharmacist sends it back with reasons. The care manager corrects it and resubmits it as a new version, with the changes marked.
Clinical pharmacist
Approved
Signs it off with an attestation.
Platform Creates the patient's Medication Action Plan and Personal Medication List.
Every version records who completed it and who signed it off. Drawn from the specification we wrote.
Security and compliance
US value-based care
Year:
Status checked
Sizing HITRUST certification before the budget was committed
Situation
Large health systems were asking a US value-based care organisation for evidence of its security before they would sign. It needed to know which HITRUST certification would satisfy them, what it would take and how long.
Finding
HITRUST i1 fitted what the health systems were asking for, but it leaves little room. Every control area has to pass, so one weak area can fail the whole assessment.
What we did
We assessed readiness across the client's code, cloud infrastructure and third-party suppliers, and planned a phased programme in which each phase ended in a decision for the client, with HITRUST's fixed waiting periods built into the timeline.
Status
Assessment and programme plan delivered, 2026.
Grassroots sport
Our product
Year:
Status checked
Concussion return to play that follows England Rugby's timeline, with the physio in charge
Situation
After a concussion, England Rugby's Graduated Return to Activity and Sport (GRAS) sets 6 stages and the earliest day each can start. It applies to every community player, whatever their age. At grassroots clubs the record often lives on paper or in a group chat, and the coach picking the team is usually a volunteer.
Finding
The rules are clear. What clubs lacked was one record of which stage each player had reached, who recorded it and when the next stage could open.
What we built
A return-to-play record that follows the 6 GRAS stages. The physio records each check as it happens, and later stages stay locked until their earliest day, counted from the injury: day 8 for non-contact training, day 15 for full contact and day 21 for a match. Only the physio can record or change a stage. The app never decides when a player moves on. It follows GRAS as published in August 2023. England Rugby has not reviewed or endorsed it.
Status
In build. The return-to-play checklist is on the Products page, with sample data.
Grassroots sport
Our product
Year:
Status checked
Session plans with age-grade contact rules built in, for volunteer coaches
Situation
Grassroots rugby runs on volunteer coaches. They plan at the kitchen table, coach on a wet pitch with no signal, and track age-grade rules, attendance and concussion return to play on paper.
Finding
The tools clubs already use handle fixtures, availability and payments. Planning a session, running it pitch-side and recording what happened to each player was still done by hand.
What we built
Session plans a coach builds from a drill library, with age-grade contact rules built in, and separate views for coaches, players, parents and physios.
Status
In build. We will publish results after its first full season.
What these case studies leave out
Case studies never include patient data, billing figures or a security weakness that might still be open. If you need more to decide, ask on the intro call and we will tell you what we can share.
Before November 2025
Organisations not named
Earlier work, by Daryn
Daryn led this work before founding Tesserium Partners in November 2025, in roles at other organisations. The organisations are not named and have not reviewed this page.
United States
2020s
Care for people with complex chronic conditions in an underserved US population
Designed and led the care programme within a care innovation venture.
2020s
Remote patient monitoring with separate views for physicians, nurses and patients
Designed the platform and led it to release, with risk screening and nurse-monitored check-ins.
2020s
Employee wellbeing with mental health screening for large employers
Designed enterprise wellbeing platforms using the PHQ-9 and GAD-7 questionnaires, connected to virtual primary care and behavioral health services.
UK and international
2020s
A digital health membership with virtual GP, physiotherapy triage and specialist booking
Oversaw development and launch for a UK private healthcare provider.
2010s
Nurse-led health support for employees, from GP referral to surgery
Led an employee health service on web and mobile for UK employers, with a named nurse for each employee and a clinical health-risk assessment.
2010s
A consumer health risk assessment in the UK, US, Singapore and Australia
Led delivery of the platform, named in The Journal of mHealth's Digital Health Global 100 in 2016.
Tell us what has to work
Daryn Shaxted leads every engagement. Tell us where the platform is and where it needs to be, or the decision you need a view on. No pitch deck needed.
What happens next
1We reply within 2 working days to say if we can help.
2If we can, we talk it through on a call.
3We send a written proposal with the scope, term and fee.