Hacker News: arohner

New comment by arohner in "Ask HN: Who is hiring? (March 2026)"

arohner — Mon, 02 Mar 2026 21:55:55 +0000

Griffin Bank | Engineering | REMOTE (UK) Company: We are Griffin Bank. We are a fully authorized, API-first bank; we bank fintechs and startups. We built our own core banking system from scratch. Experience: We are hiring across broadly across engineering. The things we work on include onboarding and KYC, payments rails, accounting, billing and reporting. We are hiring backend and frontend engineers. We are currently about 80 people, with 30 of them in engineering.

Tech: Clojure, FoundationDB, Bazel, CLJS, Svelte

https://jobs.ashbyhq.com/griffin/c8eaae48-e84f-4dae-8c34-099...

New comment by arohner in "Programming language speed comparison using Leibniz formula for π"

arohner — Fri, 19 Dec 2025 17:34:58 +0000

The Clojure version is not AOT'd, so it's measuring startup + compiler time. When properly compiled it should be comparable to the Java implementation.

New comment by arohner in "Ask HN: Who is hiring? (December 2025)"

arohner — Mon, 08 Dec 2025 19:06:12 +0000

It's fairly strictly enforced. The reason is that in many jurisdictions, you can accidentally create employment tax liability by working remotely for too long in the country.

New comment by arohner in "Flow: Actor-based language for C++, used by FoundationDB"

arohner — Mon, 08 Dec 2025 17:31:24 +0000

Griffin Bank UK uses it for our entire system (https://griffin.com)

New comment by arohner in "Ask HN: Who is hiring? (December 2025)"

arohner — Mon, 01 Dec 2025 18:04:58 +0000

Griffin Bank | Engineering | REMOTE (UK) Company: We are Griffin Bank. We are a fully authorized, API-first bank; we bank fintechs and startups. We built our own core banking system from scratch.

Experience: We are hiring across broadly across engineering. The things we work on include onboarding and KYC, payments rails, accounting, billing and reporting. We are hiring backend and frontend engineers. We are currently about 80 people, with 30 of them in engineering.

Tech: Clojure, FoundationDB, Bazel, CLJS, Svelte

Apply: https://jobs.ashbyhq.com/griffin/8d98eb78-e281-4860-b578-fc1...

New comment by arohner in "Ask HN: Who is hiring? (November 2025)"

arohner — Mon, 03 Nov 2025 19:31:45 +0000

Griffin Bank | Engineering | REMOTE (UK)

Company: We are Griffin Bank. We are a fully authorized, API-first bank; we bank fintechs and startups. We built our own core banking system from scratch.

Experience: We are hiring across broadly across engineering. The things we work on include onboarding and KYC, payments rails, accounting, billing and reporting. We are hiring backend, frontend and design system engineers. We are currently about 80 people, with 30 of them in engineering.

Tech: Clojure, FoundationDB, Bazel, CLJS, Svelte

Apply: https://jobs.ashbyhq.com/griffin/8d98eb78-e281-4860-b578-fc1...

All estimates are bad, some are useful

arohner — Thu, 13 Feb 2025 15:26:47 +0000

Article URL: https://griffin.com/blog/all-estimates-are-bad-some-are-useful

Comments URL: https://news.ycombinator.com/item?id=43036805

Points: 3

# Comments: 0

New comment by arohner in "The sad state of property-based testing libraries"

arohner — Fri, 05 Jul 2024 08:22:50 +0000

Clojure does have stateful quickcheck library now: https://github.com/griffinbank/test.contract

Parallel testing is interesting, but hasn't been a large source of pain yet.

New comment by arohner in "Griffin – A fully-regulated, API-driven bank, with Clojure"

arohner — Wed, 30 Aug 2023 09:46:11 +0000

We could in theory bank other banks, but that's not our focus. Our current customers are mostly regulated non-bank financial institutions, E-Money and Client money. As an American analogy, think Square Cash, Venmo, Paypal.

Longer term our aspiration is to also be the business bank for technology companies e.g. Apple or AirBnb or Uber. Currently Goldman is a big player in that space.

New comment by arohner in "Griffin – A fully-regulated, API-driven bank, with Clojure"

arohner — Wed, 30 Aug 2023 09:23:43 +0000

It is a tall order, but but it's doable. The most important thing is to reduce the surface area of your application. Our business logic is almost entirely pure. The 'procs' have no side effects, except for things that happen on the other side of a clojure protocol (java interface). That means all side effects can be stubbed out during tests.

Our "user" code has no access to threading libraries. Threading happens in "kernel" code.

Watch https://www.youtube.com/watch?v=4fFDFbi3toc for a good example of how this has already been done in practice.

New comment by arohner in "Introduction to Datalog"

arohner — Wed, 15 Feb 2023 14:18:46 +0000

What is the performance problem?

New comment by arohner in "Ask HN: Who is hiring? (October 2022)"

arohner — Tue, 04 Oct 2022 12:38:18 +0000

Griffin (https://www.griffin.sh) | UK, Ireland, Germany, Sweden, Portugal, Estonia | Full-time | Remote | Engineering

We're a new Banking as a Service provider (think AWS for financial services) currently seeking authorisation to become an API-first, fully regulated UK bank.

We believe that in the future, most financial innovation will happen outside banks rather than inside them, and Griffin will be the platform that all future fintechs use rather than the legacy big banks.

And a bit more about us: https://griffin.sh/culture We're looking for thoughtful people who strive to be kind in their words and actions. As product designers, we are always looking for ways to simplify complex things and we take security very seriously. As a financial institution, we believe that our customers' trust is our single most valuable asset and we will go above and beyond to earn and keep it.

Our backend stack is Clojure, FoundationDB, Kubernetes and AWS

Our frontend stack is CLJS, Reframe, Reagent, React, Stitches, Storybook, and Playroom.

Our build system is Bazel, CircleCI, AWS CDK We have an office in London but our team are distributed throughout the UK, Ireland, Germany, Sweden, Portugal and Estonia. See our jobs page for more info: https://griffin.sh/careers

New comment by arohner in "Amazon built a new unit to fix its engineering culture"

arohner — Wed, 21 Sep 2022 15:01:23 +0000

We're hiring for this role in the UK and parts of the EU: https://boards.greenhouse.io/griffin/jobs/5252742003

New comment by arohner in "Increase: Banking API"

arohner — Wed, 14 Sep 2022 12:32:30 +0000

Revolut is not a bank in the UK

New comment by arohner in "Ask HN: Who is hiring? (September 2022)"

arohner — Wed, 14 Sep 2022 11:03:00 +0000

Griffin (https://www.griffin.sh) | UK, Ireland, Germany, Sweden, Portugal | Full-time | Remote | Engineering

We're a new Banking as a Service provider (think AWS for financial services) currently seeking authorisation to become a fully regulated bank, so that we can provide safeguarding and client money bank accounts to our customers. We believe that in the future, most financial innovation will happen outside banks rather than inside them, and Griffin will be the platform that all future fintechs use rather than the boring big banks.

And a bit more about us: https://griffin.sh/culture

We're looking for thoughtful people who strive to be kind in their words and actions. As product designers, we are always looking for ways to simplify complex things and we take security very seriously. As a financial institution, we believe that our customers' trust is our single most valuable asset and we will go above and beyond to earn and keep it.

Our backend stack is Clojure, FoundationDB, Kubernetes and AWS

Our frontend stack is CLJS, Reframe, Reagent, React, Stitches, Storybook, and Playroom

Our build system is Bazel, CircleCI, AWS CDK

We have an office in London but our team are distributed throughout the UK, Ireland, Germany, Sweden and Portugal.

See our jobs page for more info: https://griffin.sh/careers

New comment by arohner in "Ask HN: Who is hiring? (March 2021)"

arohner — Thu, 04 Mar 2021 11:03:30 +0000

Griffin | Senior Engineers | London | REMOTE (UK, Ireland, Germany, Portugal, Denmark, Netherlands)

Griffin is building an API-driven online-only UK bank. Think AWS for financial services. We're building APIs to create bank accounts, make payments, issue cards. We believe that in the future, most financial innovation will happen outside banks rather than inside them, and Griffin will be the platform that all future fintechs use rather than the boring big banks. Our tech stack: Clojure, ClojureScript+React, Kafka, Datomic, Kubernetes, AWS. We're hiring for backend, frontend and infrastructure engineering. See the complete list of jobs at https://griffin.sh/jobs

New comment by arohner in "Ask HN: Who is hiring? (November 2020)"

arohner — Mon, 02 Nov 2020 17:00:04 +0000

Griffin | Senior Backend and Infrastructure Engineers | London | REMOTE (UK, Ireland, Germany, Portugal, Denmark, Netherlands)

We're hiring for engineering, VPE and more. See the complete list of jobs at https://griffin.sh/jobs

New comment by arohner in "Ask HN: Who is hiring? (October 2020)"

arohner — Thu, 01 Oct 2020 20:13:19 +0000

Griffin | Senior Backend and Infrastructure Engineers | London | REMOTE (UK and anywhere supported by boundlesshq.com)

Our tech stack: Clojure, Kafka, Datomic, Kubernetes, AWS.

https://griffin.sh/jobs

New comment by arohner in "Ask HN: Who is hiring? (September 2020)"

arohner — Tue, 01 Sep 2020 17:34:09 +0000

Griffin is applying for a UK banking license, and we're going to be AWS for financial services. We make it 10x easier for fintechs to launch new financial products.

Our tech stack is Clojure, Datomic, Kafka, Kube, AWS.

In Engineering, we are hiring for Infrastructure, Frontend and Backend. We are also hiring for Product Manager.

Apply at https://www.griffin.sh/jobs We are remote friendly, but limited to UK and Ireland right now

New comment by arohner in "Ask HN: Who is hiring? (August 2020)"

arohner — Tue, 04 Aug 2020 08:51:31 +0000

Griffin is applying for a UK banking license, and we're going to be AWS for financial services. We make it 10x easier for fintechs to launch new financial products.

Our tech stack is Clojure, Datomic, Kafka, Kube, AWS.

We are hiring for frontend engineering, backend engineering, SRE and Product Manager.

Apply at https://www.griffin.sh/jobs

We are remote friendly, but limited to UK and Ireland right now