Since 2014
Spring Hosting.
A boutique consultancy for teams building serious software — with a focus on fintech architecture, integration, and delivery. Selective engagements, run out of Karachi by Ahmad A. Khalid, currently Senior Software Engineer & Product / Team Lead on the PSL Tazama team.
What Spring does
The practice
Four things Spring shows up for. Every engagement starts with a conversation, a fixed scope, and a written proposal. No open-ended retainers, no vague "advisory" arrangements.
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Architecture review
Independent look at what you've built, what you're about to build, or what you inherited. Distributed systems, event-driven flows, API surfaces, data topology, migration paths. Written report, live walkthrough, and a punch-list you can actually act on.
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Fintech integration
ISO 20022 message design, ISO 8583 lift-and-shift, PPA / TMS integration, real-time transaction monitoring, financial-crime detection. Comfortable in the Tazama ecosystem and in front of a Technical Steering Committee.
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Delivery leadership
Short-term engagements to unblock or right-size a program: POC scoping, UAT under PMO-style governance, cross-team coordination, stakeholder alignment. Best where an engineering leader is missing between the CTO and the ICs.
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Small-team engineering
Legacy Spring Hosting territory — hands-on build work for small businesses that want their platform to keep working while they run the business. Selective; happy to hand off to a bench of trusted collaborators when the fit is better.
Track record
Selected engagements
A representative slice, not an exhaustive list. Newest first. Ask for the full CV or a targeted case study by email.
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PSL Tazama team Senior Software Engineer · Product & Team Lead
On the Tazama open-source financial-crime and transaction-monitoring platform. Simulation Studio architect and delivery lead. UAT program lead. BaseMessage extension of the frms-coe-lib presented to the client's Technical Steering Committee. Introduced ADRs and QA automation across the program.
tazama.org → -
Flowmancer Platform Lead
Designed, built, and maintained the e-commerce platform for an artisan handmade-props business over six years. Led incident recovery after a platform compromise — restored from verified backups, manually recovered six months of customer and order data. Hardened infrastructure, migrated hosting, resolved deliverability, and delivered GDPR compliance for the European customer base.
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Belle & Tangerine WooCommerce Platform Lead
Built and ran the digital storefront for a small handmade-goods label. Custom inventory and stock-management plugins replacing subscription tooling; hundreds of orders per month at peak.
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Additional Spring Hosting clients 20+ engagements
Ten years of smaller builds: WordPress stores, WooCommerce integrations, custom admin tools, migration and recovery work. Happy to walk through specific examples on a call.
Not for hire — for free
Pro-bono work
Where the mission fits and the capacity is there, Spring takes on non-profit engagements at cost or free. Not a rotation — an occasional thing, listed here because it's part of the practice's history.
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Civics Education Trust NZ
Helped set up the org's operational and technical footing so they could focus on what mattered — reaching underprivileged kids with civics education, at scale, without engineering distractions.
How it works
Three-step engagement.
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One conversation, first
Usually 30–45 minutes. What you're trying to build, what's in the way, what's already been tried. No slides, no pitch, no obligation.
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Fixed scope, written proposal
If there's a fit, you get a short written proposal with a defined outcome, timeline, and price. Not a rate card. Not a retainer with drift.
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Do the work, hand it back
Engagements end. Deliverables get handed off with the context your team needs to own them. If you want ongoing help after that, we agree on a new scope — never a rolling assumption.
Start a conversation
Get in touch.
The best-fit engagements come in by email with a paragraph of context. What are you building, what's in the way, and roughly when you'd like to move. I read every one.