Harrison Aloo | Software Engineering

Stack Engineer & Software Developer | Building web apps & algorithmic trading bots | NinjaTrader, Pine Script, Python, MT4/MT5

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

@ms_scar88 Congratulations 🎊 👏

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

@ms_scar88 @Migma_AI Congratulations 🎊

[༺ཧคlคฝคཊ༻ @rybinfx]

Web crawlers /[•]\ #js x #css

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

@Migma_AI 👌

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

@TheDreadCEO Congratulations 🎊

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

@GithubProjects https://t.co/dq2iGZ8oj8

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

2/ What I build every time:

→ Unique constraint on the M-Pesa receipt number. Not an if-statement — the if-statement loses the race. → pending → paid state machine. Success ≠ confirmed. → A reconciler for callbacks that never arrive at all.

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

1/ M-Pesa will send you the same payment confirmation twice.

If your code trusts it, you just credited someone's account twice.

Safaricom retries callbacks when they don't get a clean ack. Most integrations handle the second one wrong.

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

Software Engineer as a Service.

We keep it running.
You keep building.

Backend • Full Stack • AI • Automation

#SoftwareEngineering #AI #Automation #BuildInPublic

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

@coinhold_wallet That’s exactly the idea. The callback should be idempotent: same reference → same payment result, with no second balance mutation.
The key is treating the receipt/reference as the idempotency key and persisting the payment state before processing retries

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

1/ M-Pesa will send you the same payment confirmation twice.

If your code trusts it, you just credited someone's account twice.

Safaricom retries callbacks when they don't get a clean ack. Most integrations handle the second one wrong.

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

Mobile money has no synchronous confirmation. Correctness lives in the reconciliation, not the request.

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

3/ The first two protect you from double-charging.

Only the third protects the customer who paid and got nothing.

Mobile money has no synchronous confirmation. Correctness lives in the reconciliation, not the

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

2/ What I build every time:

→ Unique constraint on the M-Pesa receipt number. Not an if-statement — the if-statement loses the race. → pending → paid state machine. Success ≠ confirmed. → A reconciler for callbacks that never arrive at all.

[Migma AI @Migma_AI]

What if sending a marketing email was as easy as sending a Telegram message? ✈️

With Migma, it is.

Plan, design, send and track your business emails, all from Telegram, in seconds.

No drag-and-drop. No manual work. Just on-brand emails, ready to go.

Who’s ready to try it?
➡️ https://t.co/1KWQicUCjm

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

@RohOnChain https://t.co/dq2iGZ8oj8

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

Don’t just build software. Solve something.
Good technology should solve real problems, simplify processes, create value, and make a measurable impact.
That’s the mindset behind how I approach software engineering.
Build with purpose. Build for impact.
#SoftwareEngineering #Tech

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

🔐 API security starts long before deployment. Authentication, authorization, input validation, rate limiting, and monitoring all matter. I wrote a practical guide covering the essentials. 👇

https://t.co/kxOLyPg7cS

#APISecurity #BackendDevelopment #SoftwareEngineering

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

Every visitor is motivation to keep building. 🚀

📈 Portfolio this week:
• 21 visitors (+133%)
• 29 page views (+71%)

More projects, more blogs, and more learning coming soon.

🔗 https://t.co/ps5Z2oXgTM

#BuildInPublic #React #FullStack #SoftwareEngineering

[Harrison Aloo | Software Engineering @HarrisonAlooDev]

Need a website, mobile app, or custom software?

I build modern, scalable digital solutions for startups and businesses.

🌐 https://t.co/cctSEAkvxg

#WebDevelopment #BuildInPublic #SoftwareEngineer #ReactJS #NextJS #RemoteJobs #RemoteWork