calderarrow

Joined 7 years ago

Karma
632
Submissions
82
Member since
Aug 22
Certified Public Accountant turned fintech engineer (MS in Accountancy & MS in CS). I used to build financial tools & technology for a credit card company whose product you may have in your wallet. Now, I work for a startup credit bureau.
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Recent submissions

Comment · 2 months ago
I'm building Duolingo for blackjack card counting. It's a Progressive Web App so you can install, learn, and practice cross-platform, and it is designed to combine a mastery-styled lesson plan (e.g. you can't move onto until you demonstrate mastery of the current lesson) along with exercises and tools for keeping the skills sharp. A complete novice should be able to pick it up and become a profitable blackjack player.

It also contains tools for scouting casinos, logging sessions, calculating effective profit-per-hour based on table rules, and other things a professional would need.

I'm in the process of polishing it up, and am aiming to launch Fall 2026. Current pricing plan is to be ~$10-15 per month for the pro tools, but provide the offline capabilities, lesson plan, and learning tools completely free without ads or weird gimmicks like a limited number of lessons or practice per day.

Comment · 3 months ago
> Court rules employee has the right to make the comments she made

Random HN comment:

> her comments were unprofessional and she has no right to distract the company.

Same User:

> y Downvote :(

Comment · 5 months ago
I’m building a blackjack card counting tool for people to learn how to count and how to identify games that are winnable. It is designed to take a completely novice to an advanced, winning card counter, using a Duolingo like approach - mastery based learning across sequential modules. Minus the ads and dark patterns.
Comment · 7 months ago
Comment · 9 months ago
This is the proper approach when deciding whether to use any type of tool or technology. Is the increased amount of cognitive overhead for someone with minimal exposure to your system (who will have to maintain it when you’ve moved on) worth the increased performance on a dollars-per-hour basis? If so, it may be a good option. If not, it doesn’t matter how much better the relative performance is.
Comment · 11 months ago
Bank Rank — an automated bank account that dynamically allocates your money across the best accounts to maximize your rate at all times.

We’re doing an alpha launch in Q1 2026, and if you’re interested, sign up at bankrank.io/waitlist or email [email protected]

Comment · 1 year ago
Two big reasons:

1. If the government is in charge of deciding the tax policy and collecting the taxes, it creates a potential conflict of interest if they are also in charge of telling you how much you owe. In theory, they could charge you more than they're legally allowed to, but how would you know unless you (or someone else) also calculated your taxes? A common suggestion to this is to have the government give a return that shows what they _think_ is owed, but this creates a conflict if the government accidentally underbills you, since you're not likely to correct the mistake. In order to ensure compliance on both sides, both the government and individual need to prepare the tax return. Otherwise, one party risks being overcharged/underpaid.

2. Tax evasion is an effective law enforcement tool for catching criminals, so by putting the burden on the individual to report taxes, you add another tool in the law enforcement toolkit. From the state's perspective, it is more compelling to tell a jury "this person owed $5 but only paid $1" than "this person owed $5, but only paid $1 because we told them they only owed $1." Tax evasion is how famous gangsters like Al Capone and other shady-characters have historically been caught[0]

The tax prep industry is lucrative largely because of lobbying and consumer ignorance. There are plenty of free-file options for folks below certain income thresholds, as well as non-profits who will do your taxes for free. There are also lots of free tax-prep sites, but they are being drowned out by the advertising and lobbying of the for-profit tax-prep industry.

To add my own 2-cents: if your income comes from investments, 1099, or W2, you likely can do your own taxes in about an hour. I personally use TaxHawk [1] since it's free for federal and $16 per state return, and has the same kind of interface as turbotax and the like. If you want to save on that $16, you could use TaxSlayer [2] instead -- I've used all of them, and personally prefer TaxHawk. Just remember to decline any of the upselling they do just before you submit your refund. You probably don't need the premium service, a dedicated tax pro, nor audit protection.

Source: am a CPA

[0] https://en.wikipedia.org/wiki/Al_Capone#Tax_evasion

[1] https://www.taxhawk.com/software/

[2] https://www.taxslayer.com/#sf_qualify

Comment · 1 year ago
I’m building a tool to automatically move deposits into new bank accounts with better rates and fees. It will operate continuously, so I never have to search for the “best” bank account — I’ll always have it. Think wealthfront for checking and savings.
Comment · 1 year ago
Are you able to share a bit more about this? Specifically:

1. How did you find your first customers?

2. How did you determine a price?

3. What are the payment plans based on? Usage? Flat rate? Something else?

4. How much are you currently earning MRR and what are your costs like?

Comment · 1 year ago
I work in software now, but I was an accounting major, CPA, and worked in Public Accounting for 4 years before making the switch.

Accounting actually is more of a trade, and I felt like the majority of classes they taught helped me on-the-job as an accountant. People who like systems engineering would enjoy accounting, because it's getting to the nuts-and-bolts of our financial system and understanding both the how and the why. Whether you're international conglomerate Apple, Inc or software engineer calderarrow working a day job, the laws of accounting still apply.

But I would not recommend paying more than you need to for an Accounting Degree. The Big 4 will recruit anyone from anywhere, and as long as you have a degree (which is usually required for the CPA License) and a 3.3+ GPA, you can get a job in any major city. Assets + Liabilities = Equity whether you're at community college or Harvard, so get the cheapest degree you can get.

Also, try to squeeze 150 credits into your undergrad curiculum, as some CPA licenses require 150 credit hours. This is typically 4 years of undergrad (120) + 1 year of a master's (30). The added cost of tuition for those classes isn't that much, but being able to get out and start working a year sooner is a ~$60k decision that is worth it if you can do it.

As for why I left accounting: I started learning Python to help me automate some of the boring parts of my job [0] and fell in love with software. It just clicked for me in the same way that accounting did, and now I work in fintech, where I'm able to blend the two.

[0] https://automatetheboringstuff.com/

Comment · 2 years ago
With capital punishment, we remove the possibility of fixing our mistake if someone is innocent. But if we lock someone up for 30 years, they have the opportunity for justice to be served, and we have mechanics to _try_ to make it right.

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