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nickreffitt

Re:Ask HN: What are you working on? (September 2026) on Thursday September 17, 2026 @04:28AM (#49737928)
It's now fixed!
Re:Ask HN: What are you working on? (September 2026) on Monday September 14, 2026 @06:34AM (#49694655)
Awesome, let me know when your ready for testers, happy to help!

Thanks for the UI feedback, will sort that today :)

Re:Ask HN: What are you working on? (September 2026) on Monday September 14, 2026 @04:49AM (#49693814)
Fluir, a web app that improves Spanish speaking beyond A2 https://getfluir.app

I hit a plateau with my learning, having used Duolingo + tutor. It was only until I tried to read a book that I felt like I was making real progress. Highlighting words in Kindle, exporting them to Anki, then feeding back my progress to my tutor was fiddly and not a good use of my time. Also practicing my speaking once a day wasn't enough.

So I built an app to help me. This app will: 1. Generate Spanish short stories using Claude pitched to your level, narrated with ElevenLabs 2. Every word/phrase you highlight becomes a flashcard. Flashcards use spaced repetition - words you find difficult come up more often per review 3. Chat with Lucía - a turn based conversation who is prompted with the words/phrases you have saved down

You get a use of all the features before subscribing (1 short story, 1 round of flashcards, 1 minute with Lucía), then it's a 7 day trial.

Would love to get some feedback, especially on the AI conversation, as that's the most challenging part of the app I've found so far.

Re:Ask HN: Who is hiring? (February 2021) on Tuesday February 02, 2021 @02:11AM (#25998143)
Tapjoy | https://www.tapjoy.com/ | SF, Boston, London | Full-Time

Tapjoy is one of the premium video ad networks on mobile. Started in 2007, we help monetise over 40,000 apps, and drive ROAS for both top brands and app publishers such as Dollar Shave Club, Funplus Games and JamCity.

We have interesting challenges at Tapjoy, particularly in our DS team (which we are expanding significantly) and we're looking for talented individuals who enjoy working independently, have strong opinions on how to approach problems, and are to collaborate effectively with peers.

Senior Product Manager, Data Science | MA, CA, TX, TN | https://careers.jobscore.com/careers/tapjoy/jobs/senior-prod...

Machine Learning Engineer | UK | https://careers.jobscore.com/careers/tapjoy/jobs/machine-lea...

Machine Learning Engineer | CA, MA, TX, TN | https://careers.jobscore.com/careers/tapjoy/jobs/machine-lea...

Senior Software Engineer - Java | UK | https://careers.jobscore.com/careers/tapjoy/jobs/senior-soft...

Feel free to e-mail me if you have any questions: nick [dot] reffitt [at] tapjoy [dot] com

Re:Ask HN: Who is hiring? (April 2020) on Monday April 06, 2020 @09:53AM (#22793684)
Tapjoy | https://www.tapjoy.com/ | SF, Boston, SF, Seoul, London | Full-Time

Tapjoy is one of the premium video ad networks on mobile. Started in 2007, we help monetise over 40,000 apps, and drive ROAS for both top brands and app publishers such as Dollar Shave Club, Funplus Games and JamCity.

We don't just offer video ad units, we power a rich in-game reward system called Offerwall, a survey product called MobileVoice, and we acquired a mobile mediation tool in 2018 called Tapdaq (which I am a co-founder of).

We have interesting challenges at Tapjoy, particularly in our DS team (which we are expanding significantly) and we're looking for talented individuals who enjoy working independently, have strong opinions on how to approach problems, and able to listen to and take onboard perspectives from their co-workers.

* Data Science

Senior Data Scientist | London, UK | https://careers.jobscore.com/careers/tapjoy/jobs/senior-data...

Senior Data Engineer | San Francisco, CA | https://careers.jobscore.com/careers/tapjoy/jobs/senior-data...

Staff Machine Learning Engineer | San Francisco, CA | https://careers.jobscore.com/careers/tapjoy/jobs/staff-machi...

Data Scientist | Seoul, South Korea | https://careers.jobscore.com/careers/tapjoy/jobs/data-scient...

Manager of Data Science | San Francisco, CA | https://careers.jobscore.com/careers/tapjoy/jobs/manager-of-...

* Engineering

Senior Integrations Engineer | San Francisco, CA | https://careers.jobscore.com/careers/tapjoy/jobs/senior-inte...

Senior Software Engineer - iOS, Android, Unity SDK | San Francisco, CA | https://careers.jobscore.com/careers/tapjoy/jobs/senior-soft...

Senior Backend Engineer | Seoul, South Korea | https://careers.jobscore.com/careers/tapjoy/jobs/senior-engi...

Feel free to e-mail me if you have any questions: nick [dot] reffitt [at] tapjoy [dot] com

Re:Ask HN: Who is hiring? (July 2017) on Monday July 03, 2017 @12:45PM (#14689619)
Tapdaq (https://tapdaq.com) | London / Prague | FULLTIME, VISA

Tapdaq enables mobile developers to grow, retain and monetise their app’s user base. Over 4,000 developers use our in-app advertising to set up efficient cross promotion campaigns between their own apps, and our ad mediation to maximise their revenue. Our vision is to become the default inventory management platform for mobile applications.

We have two openings:

- Java Engineer (London): https://tapdaq.com/jobs#java-engineer

- Web Developer (Prague): https://tapdaq.com/jobs#web-developer

If you have any questions, feel free to message me on [email protected]

Re:Ask HN: Who is hiring? (August 2016) on Monday August 01, 2016 @12:21PM (#12203642)
Tapdaq | London, UK | https://tapdaq.com | Full-Time | ONSITE

Tapdaq enables mobile developers to grow and retain their app’s user base. Over 3,000 mobile developers use our in-app advertising to set up efficient cross promotion campaigns between their own apps, and install exchange campaigns with other developers on the platform.

VC backed and based in Farringdon, London. Our vision is to become the default inventory management platform for mobile applications.

We're hiring:

- Full-stack Web Developer - Javascript, Node.js, more details: https://tapdaq.com/jobs#Web-Engineer

- DevOps Engineer - saltstack, jenkins, comfortable working with java/node.js/python deployments

Apply by sending your CV to [email protected] or e-mail me directly on [email protected] if you have any questions.

Press coverage:

https://techcrunch.com/2016/01/28/balderton-backed-in-app-ad...

http://www.pocketgamer.biz/comment-and-opinion/63627/app-sto...

http://venturebeat.com/2016/06/18/apples-new-search-ads-are-...

Re:Ask HN: Who is hiring? (June 2015) on Tuesday June 02, 2015 @05:08AM (#9644700)
Sysadmin - London, UK - REMOTE an option

As a Sysadmin at Tapdaq you will be working to improve the reliability and performance of our web services. You will work shoulder-to-shoulder with our engineers to design and build the next generation of web applications and systems infrastructure, focusing on automation, availability and performance.

Our stack is built on Google Cloud, and consists of Java (Jetty), Node.js (Express), Apache Kafka, MySQL, MongoDB.

## Responsibilities

* Work with our engineers to design, build, and maintain systems.

* Write scripts to monitor and automate processes.

* Troubleshoot issues across the entire stack - hardware, software, application and network.

* Participate in code reviews for projects.

## Qualifications

* 2+ years industry experience as Software engineer.

* Demonstrable knowledge of TCP/IP, HTTP, web application security, and experience in multi-tier web application architectures.

* Hands-on experience in building event driven backend systems on JVM with Java.

* Ability to prioritise tasks and work independently.

* Track record of practical problem solving, excellent communication, and documentation skills.

## Perks

* Macbook Pro.

* Loose vacation policy.

* Bi-annual company retreats.

* Based in Balderton Capital’s stunning office in Kings Cross, London.

* Join in on conversations with our advisors: https://tapdaq.com/about

E-mail the co-founder to apply: [email protected]