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arun rajkumar

CTO & Co-Founder, Atoa. Building open banking payments for the UK. Half the cost of cards. Instant settlement. FCA-authorised. I hire for intent, not resumes. I write about payments, AI, and the messy

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Payment Webhooks Will Lie To You. Here's How We Built Ones That Don't (in NestJS)
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Payment Webhooks Will Lie To You. Here's How We Built Ones That Don't (in NestJS)

#nestjs #webhooks #openbanking #node
1
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4 min read

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I Asked Three Coding Agents to Build My Son's Cricket Coach a Website. The Result Wasn't Decided by the Model — It Was Decided by Taste.
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I Asked Three Coding Agents to Build My Son's Cricket Coach a Website. The Result Wasn't Decided by the Model — It Was Decided by Taste.

#ai #agents #webdev #startup
2
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10 min read
Your Agent Doesn't Need a Better Model — It Needs a Context Layer
mickyarun profile

Your Agent Doesn't Need a Better Model — It Needs a Context Layer

#devops #ai #agents #sre
2
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6 min read
What Developers Get Wrong About PSD2 and Payment Initiation
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What Developers Get Wrong About PSD2 and Payment Initiation

#psd2 #openbanking #fintech #api
2
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4 min read
We Built an Open-Source Coding Exam Platform Because Every Vendor Let Us Down
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We Built an Open-Source Coding Exam Platform Because Every Vendor Let Us Down

#opensource #hiring #webdev #ai
5
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5 min read
Open Banking Was Built for the Wrong Future — and That's Why It's Perfect for AI Agents
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Open Banking Was Built for the Wrong Future — and That's Why It's Perfect for AI Agents

#webdev #ai #openbanking #fintech
1
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6 min read
How Open Banking APIs Actually Work — A Developer's Guide
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How Open Banking APIs Actually Work — A Developer's Guide

#openbanking #api #fintech #webdev
1
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4 min read
Why Open Banking Is Eating Card Payments in the UK (And the Numbers Prove It)
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Why Open Banking Is Eating Card Payments in the UK (And the Numbers Prove It)

#openbanking #fintech #webdev #javascript
1
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5 min read
How We Built Atoa's Payment Infrastructure with 15 NestJS Microservices (And What Took the Most Figuring Out)
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How We Built Atoa's Payment Infrastructure with 15 NestJS Microservices (And What Took the Most Figuring Out)

#nestjs #microservices #openbanking #fintech
2
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4 min read
We Had 15 Microservices and It Took 2 Weeks to Onboard a Developer. Here's How We Fixed It in a Weekend.
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We Had 15 Microservices and It Took 2 Weeks to Onboard a Developer. Here's How We Fixed It in a Weekend.

#microservices #devops #typescript #startup
1
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9 min read
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