Penumbra LLC builds websites, custom software, mobile apps, and games for businesses and creators who want something that reflectstheir vision.
A great site says exactly what you do, makes it easy to reach you, and feels like it was made with care — because it was.
Off-the-shelf software makes you adapt to it. Custom software adapts to you — and that difference is felt every single day.
From casual games to deeper experiences — we build mobile games that are smooth, engaging, and designed with the player in mind from the very first screen.
Whether your idea is still on paper or ready to build, we help shape it into something tangible, usable, and genuinely useful.
Sometimes the smartest move is slowing down to figure out what to build, how to build it, and what to skip entirely.
Penumbra LLC is a creative custom software studio for clients who want more than a generic build. We spend real time understanding what you need, then we build it carefully and keep communication honest throughout.
You work directly with the person responsible for your project — not an account manager passing messages back and forth. That means faster answers, sharper decisions, and work that stays focused on what actually matters to your business.
We do our best work when a project needs a custom feel, a creative edge, or a technical partner who can help figure out the right path. If you have a real problem, we want to help solve it properly.
Internal tools, dashboards, client portals, and systems built around how your team actually operates.
Web experiences that explain your business clearly, look sharp, and give visitors a reason to reach out.
Original iOS and Android games — from casual concepts to deeper mechanics — built to feel good and perform well.
Early product ideas, mobile experiences, and prototypes that help you test, learn, and build with confidence.
Help with planning, architecture, product direction, and the choices that shape everything built after them.
We stick around after launch — refining, improving, and helping your product grow as your needs change.
Penumbra LLC was founded by Jai Goel. Jai studied Computer Science and Mathematics and has spent several years doing professional technical work, including an AI Research role at Pratt & Whitney and his current work at Yale University. He brings the kind of technical depth and practical thinking that clients notice from the very first conversation.
Jai combines a strong technical foundation with a clear, direct working style. Clients get someone who can think through the problem, explain the options without jargon, and build with genuine care for the outcome.
We start by learning the business, the users, and the real reason the project matters.
We turn the idea into a clear path with the right features, structure, and technical approach.
We create the product with real attention to detail, steady communication, and honest testing.
We help with launch, improvements, and whatever comes next after the first version is out in the world.
Share a little about your project, your goals, or the problem you want to solve. You do not need to have everything figured out. A short message is plenty to get a real conversation started.
Send a short note and we will get back to you soon.