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Work

Problems solved in production.

Every piece here is work by our practice leads. Prior work is shown as prior work, with who delivered it and where. Client names are withheld where agreements require it.

Backend and platform engineering

Healthcare SaaS

Building a Multi-Tenant Care-Coordination Platform for Hospitals

Problem

Coordinating each surgical patient's journey was largely manual, and every hospital ran a different EHR.

What changed

An automation engine for the patient journey, one FHIR-based integration layer for every EHR vendor, and tenant scoping enforced at the data layer.

Result

Patient coordination became automated across hospitals, and a class of timezone and data-mismatch errors that contacted patients at the wrong time was eliminated.

Delivered by Tahir as a backend engineer at a healthcare technology company, before Carpediemsoft.

  • Node.js
  • Express
  • MongoDB / Mongoose
  • Redis
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EdTech / SaaS

Hardening a Self-Service Booking Engine

Problem

The booking engine had 36 passing tests, but none of them executed its core guarantee: a tutor can't be double-booked.

What changed

Row locks shared by the booking, confirm and reschedule paths, conflicts checked against both calendars, and every failed slot reported at once.

Result

The locks went from zero executed tests to a suite that proves them on PostgreSQL, including races across plans.

Delivered by Tahir as a full-stack engineer on a multi-country online tutoring platform, before Carpediemsoft.

  • Python
  • FastAPI
  • SQLModel / SQLAlchemy
  • Alembic
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EdTech / SaaS

Centralising Tutor Pay and Finance

Problem

Tutor pay was computed three different ways, and the browser did its own maths.

What changed

One server-side rate seam and one earnings aggregate, read by both the earnings card and payout generation.

0 of 29production plans differed after the pay backfill

Result

Three divergent pay computations became one, and the backfill was verified against production before the old columns were retired.

Delivered by Tahir as a full-stack engineer on a multi-country online tutoring platform, before Carpediemsoft.

  • Python
  • FastAPI
  • SQLModel
  • Alembic
Read the case study

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