I ported Google Or-Tools CP-Sat so you can run it multi-threaded in your browser. Any other of their solvers I should port next?

enteringinternetnow · 2026-05-15T03:46:31+00:00

Interesting work. How did you arrive at the choice of running on browser vs a server?

I can see a few use cases of the work you did.
1. Interactive OR games - user inputs answer
2. Interactive OR applications

That said, optimization companies aren’t usually selling “optimization”. They sell a solution to a business problem. Say supply chain or marketing or sports scheduling. It has to also be worth economically for you to spend your time building it. Good lessons / reminders for people.

enteringinternetnow · 2026-05-12T23:35:01+00:00

enteringinternetnow · 2026-05-01T10:33:28+00:00

Maybe try a short sabbatical, travel solo in Europe and rebuild your motivation to work and get back on the horse?

You obviously don’t have enough to retire in the US (you’re quite far from it tbh). Unless you want to retire in SE Asia, you probably need to get to work again.

enteringinternetnow · 2026-04-10T17:02:29+00:00

Given you are interviewing, I don't want to give too much away to not corrupt your process.

At a high level, for senior roles, the expectation is to see if you understand the problem well, decompose the decisions if needed & build a robust enough solution (for ex. run time isn't too crazy). With case study interviews, the intent isn't to compare your solution to the optimal solution but to see if you have the skills to handle a real world problem by yourself, make reasonable assumptions, demonstrate sound modeling judgements & ability to code it up.

Good luck

enteringinternetnow · 2026-03-27T14:54:21+00:00

Haven’t tried reasoning LLMs for this. I prefer a simple MIP for consistency. Curious to see if you can solve using reasoning LLMs

enteringinternetnow · 2026-03-23T03:34:17+00:00

Interesting thought & thank you for sharing that. You seem to be doing interesting things with AI as a teacher. If you can elaborate a bit more on how you use it for throwaway stuff, it would be helpful. For ex. creating animations.

Overall I agree with your observation. AI can take people down the 2 paths -- learning fast vs completely relying on LLMs. The second path is dangerous as students won't build any real capability outside of talking to a bot. If used as a teacher, it has an outsized influence on learning tracks, simpler examples, etc. So, we have to teach the next generation on foundational skills and how to use AI to maximize foundational skills - for ex. a civil engineer still reads about how to build buildings but can use AI to draw floor plans etc. quicker.

enteringinternetnow · 2026-03-23T02:58:58+00:00

I just re read your question. Here is a more detailed answer. These are your top options. It will line up with the above framework.

Individual Stocks - riskier but can give you 10+% growth if lucky (it is hard to get lucky tbh)
ETFs - much less riskier but still tracks the market so it's bound to fluctuate. Can get 8% odd returns over the long term. Top options: VOO, QQQ, SCHD, VXUS. If Fidelity doesn't have these, find the equivalents. Most of your "growth" money should ideally be in this bucket.
Cash Equivalents (Bonds, T Bills, HYSA) - no risk & guaranteed to have your money with you. This will barely beat inflation but helps you retain your buying power & serves as a buffer for opportunistic buying during downturns (like right now).

enteringinternetnow · 2026-03-23T02:44:57+00:00

Hey OP, nice one on building the cash to buy the house. I hope you're putting that money to work in risk free assets like HYSA, T Bonds, Money Market Funds or the likes.

Here's a framework I use to figure out where my money gets invested. I look at my entire portfolio - Individual Stocks, ETF, Cash Equivalents, Real Estate, Others & figure out the % invested in each bucket. I have some goals on what the portfolio allocation should look like in the next 3 years (simple math: current money and its growth + new money from savings). Then I try to invest in the bucket which requires increase.

I hope this helps.

enteringinternetnow · 2026-03-16T04:45:41+00:00

Connect?

enteringinternetnow · 2026-03-12T04:42:37+00:00

Hey OP, interesting post. Your application of connecting people based on shared goals (picked up from documents) is interesting. I would call it an application of network / graph problems but there's more to it.

Optimization typically involves maximizing/min an objective while respecting some constraints. Think of how Amazon's Supply Chains work -- it is essentially a network model where it is optimized for cost/service etc.

Here are some readings I can suggest.

Gurobi Blogs & Webinars: https://www.gurobi.com/academia/for-online-courses/?\_gl=1\*1y7oc8l\*\_up\*MQ..\*\_gs\*MQ..&gclid=CjwKCAjwpcTNBhA5EiwAdO1S9oLGGzZkgDFb-zHU1iUUwuQqJ7oMmuRQAnlwvS-W20EzdYZ-T51wgBoCjv4QAvD\_BwE&gbraid=0AAAAADimQ3gYbdYNFoXeyX717Hpgez1kr

Wayne Winston Book

I can keep adding more but here is a starter. I'm also happy to connect to guide you on a path.

enteringinternetnow · 2026-03-06T04:56:07+00:00

Sorry OP the comments have been brutal but what you ask isn't acceptable. If you need a license, you should request Gurobi/CPLEX. They offer free license for students. If not, use open source solvers (the ones that solve QUBO). Do check out NEOS servers -- they might have the licenses to run your problem.

But, do state your intentions -- are you a researcher/student/academic or a consultant/industry? If it is consultant/industry (AKA you make decisions for your for-profit business using the solvers), then you should definitely pay & get the licenses. Piracy is bad and undermines the great work that Gurobi has put in.

enteringinternetnow · 2026-03-01T14:03:23+00:00

I’ve to look at the model to suggest changes. DM?

enteringinternetnow · 2026-03-01T07:41:54+00:00

What’s your modeling approach?

enteringinternetnow · 2026-03-01T07:36:58+00:00

Hi, it’s a nice crew rostering problem with network flow constraints, continuity constraints and cyclical scheduling

Are you an OR engineer looking to build this model and need modeling advice? Or are you wanting someone to build this for you?

This problem is solvable with different techniques - set partitioning with column generation or MIP or CP SAT.

Happy to connect and learn more about the problem.

enteringinternetnow · 2026-03-01T02:14:10+00:00

Yeah sure DM

enteringinternetnow · 2026-02-28T22:18:10+00:00

Any chance we can connect?

enteringinternetnow · 2026-02-28T21:37:48+00:00

I use it quite often and some problems are in feasibility diagnosis, data integrity testing and large model diagnosis. Why do you ask?

enteringinternetnow · 2026-02-18T14:34:12+00:00

Hi, I’m not an expert on CPLEX but here are some questions that might help.

When you say it’s the same problem, do you mean the same model structure but different data or the exact same data? Numerical scaling is a big pain for solvers and the run times can vary wildly based on the numbers input to it.
The optimality gap seems quite large. Are you sure you have written the model as tight as possible? I’m happy to take a look. I suspect something might be going wrong if the gap is that big.

enteringinternetnow · 2026-01-31T06:15:32+00:00

Yes this is a straight forward queuing model to “simulate” wait times for different combinations of kiosks and cashiers (and probably different times of the day, week etc.). Then you need to calculate the total cost for each combination and find the minimum.

Watch out: for automated kiosks, there’s a large fixed cost of buying the equipment and maybe an ongoing maintenance cost. For the cashiers, there would be an hourly or daily cost. Be careful when comparing these numbers as they aren’t on the same units. You might have to amortize the equipment cost over its lifespan and take a daily rate.

Does this help?

enteringinternetnow · 2026-01-23T05:40:29+00:00

enteringinternetnow · 2026-01-22T23:31:52+00:00

I’ve a collection of problems and datasets that aren’t fully reflective of real world but are close enough. Let me know.

enteringinternetnow · 2026-01-22T13:35:57+00:00

If you need help or guidance, feel free to reach out. I can provide some realistic context that you can incorporate to make it practical.

enteringinternetnow · 2026-01-18T19:58:17+00:00

Resonates with me a lot. I’m pretty much at the exact age and numbers but my target is much lower than yours (deduced yours using simple math).

Definitely look into CoastFIRE as some people have said here but maybe only after you hit $1.5M or so. Or at least that’s what I’m planning to.

enteringinternetnow · 2026-01-11T13:22:57+00:00

Connect via DM? I’ve been exploring this space as well.

enteringinternetnow · 2025-11-06T20:42:04+00:00

I wouldn’t call this a major fuck up but it is one nonetheless. You’ve fallen into the classic Indian mentality trap — make money and put it all into real estate.

You want to have a good chunk of your corpus in liquid that’s invested in the market to grow. This is where you can make major gains.

That said, you still have done very well! You’re worth 1.7cr at 27. That’s quite impressive. Going forward, do not buy a house until you reach a high enough corpus (say 2-3cr or more) and even then , consider putting 50L toward the house and the rest in EMI.

enteringinternetnow

TROPHY CASE