Doublefin

Inspired by Google’s Applied CS with Android, this adaptation for Flutter provides an interactive way to understand Arrays, HashSets, and HashMaps.

Here's How to Learn Data Structures the Fun Way With Flutter

In this article, we’ll learn how we can utilize the QuickBlox SDK to create polls and surveys in your Flutter chat applications.

A Guide to Creating Fun User Polls and Surveys With QuickBlox in Your Flutter App

Create a dynamic Input widget, one for both sign-in and registration, add some animation, and validate the user input in Flutter.

How to Implement a Dynamic Authentication Form in Flutter

Create an onboard screen with smooth animations in Flutter for both Android and iOS. Use shared preference to onboard only once, saving you and your users time.

How To Create An Onboard Screen In Android and IOS with Flutter?

Generic Programming in Go using different methods: interfaces, typecasting, Generic Functions

Generic Programming in Go

This week's "crypto crash" is more of an "everything crash", and no cause for alarm. Check out the surrounding context and do not fall for media scaremongers

Crypto Crash? Not Really... 

In this article I’ll introduce an implementation for Singly and Doubly Linked Lists, which you can reuse or modify for your own purposes. All the code is available in github or as an npm package.

A Linked List Implementation for Ethereum [Deep Dive]

This is a 3-part analysis on a more sociological take on the history of world reserve currencies to preface the purely financial or technical discussions of stablecoin and digital currency mechanics. By no means am I providing the end-all-be-all guide on stablecoin design, but merely providing some anthropological equipment on how to approach the stablecoin discourse and what other thoughts came about from this mode of analysis and way of thinking. Part II aims to explain a theory on the origination of the velocity (or vortex) of money created by this “mortal sink” and other sink candidates; part III briefly examines the new freedom of currency choice and the role of central wisdom authorities on debt and what commodity sinks might exist in a non-sovereign, digital society. Thematically, the following document centers the participant, not the government or issuing body, as the primary agent of a currency’s functionality. This will be essential in future designs for somea participant-owned, decentralized future.

“Proof-of-Nuclear-Bombs”: a most reliable design for stablecoin utility (Part I)

Advocating for classic AI over generative AI in business, because of reproducibility, scientific rigor, and reliability for mission-critical systems.

Doubling Down on Classic AI: Why I'm Betting on Science Over Spectacle in Business

Cartesi shifts to strengthen Ethereum's core infrastructure, leveraging its Stage 2 rollup, fraud proofs, and RISC-V tech for enhanced scalability and security.

Why is Cartesi Doubling Down on Ethereum?

10 interview questions with TLVTech Founder and CEO, Daniel Gorlovetsky. 

"We're doubling-down on AI, on multiple fronts" says Founder & CEO of TLVTech 

A description on how Twitter has changed the character count of its Tweets based on the density of a language.

Looking Back at Doubling the Twitter Character Count - Looking After Number One-forty

TrustToken, the team responsible for launching TrueFi, announces the acquisition of EthWorks.

TrustToken acquires EthWorks, Doubling its Team to Scale TrueFi

For some time now I’ve been making an unassailable and unchallenged argument that Bitcoin and Bitcoin services are no different to the monies and services found in video games. Now, thanks to my favourite gamer, we have one of the best examples yet of “Bitcoin Doublethink”, second only to the very cute Pigsby which uses a “Blockchain” for its database.

Bitcoin Doublethink.

Hi Guys&nbsp;, last article we spoke about addition&nbsp;, one of the most important “invented” operations on eliptic curve arithmetic&nbsp;. There’s been great feedback highlihghting that the rule “if a line crosses two points&nbsp;, it will cross a third point” might not be absolute.

Elliptic Curve Crypto ,Point Doubling

I became a project manager in a game company in 2021 and witnessed how production processes evolved in parallel with the rapid emergence of new AI tools.

Adapting to AI: Insights from a Project Manager in Game Development

We built, learned, traveled, collaborated, and celebrated — with many more milestones to come!

SDG 2025 Year in Review: A Bold Leap Into the Future of Social Discovery

The space-themed event offers its largest prize pool to date, totaling $450,000 USDC. Daily prizes include a Unitree R1 Humanoid Robot, a World Trip Prize, and 

Deribit and SignalPlus Launch 2025 Trading Competition, Featuring a $450,000 USDC Prize Pool

Optimal trustlessness and cybersecurity evade both sides – DeFi and AI – of the DeFAI industry, resulting in $59B erased from DeFi due to breaches and hacks

The DeFAI Crucible: Navigating Trust and Automation in a Nascent Market

AI startups raised over $1.8 billion this week across data labeling, enterprise AI infrastructure, video generation, and legal tech innovation

Weekly AI Startup Funding: October 26 - November 1, 2025

The tension between uptime, cost, and velocity has never been sharper.

The Hidden Economics of Reliability: Balancing Uptime, Cost, and Innovation in DevOps

Limitless Prediction Market Closes $10M Seed Round Ahead Of LMTS Token Launch

gTrade launches $400k Halloween trading contest exclusively on Arbitrum from Oct 22-Nov 19. Analysis of strategy behind single-chain focus.

How gTrade Plans to Consolidate $113 Billion in Volume on Arbitrum With a $400,000 Trading Contest

AI startups raised over $4.1 billion this week, with watershed moments in open-source AI, legal technology, and energy infrastructure.

Weekly AI Startup Funding: October 5-11, 2025

We build products for financial budget planning and management and headcount budget planning and management for growth-stage startups

DOUBLEFIN

doublefin.com

11-50 emps

Since 2019

Doublefin's stories on HackerNoon

Here's How to Learn Data Structures the Fun Way With Flutter

A Guide to Creating Fun User Polls and Surveys With QuickBlox in Your Flutter App

How to Implement a Dynamic Authentication Form in Flutter

How To Create An Onboard Screen In Android and IOS with Flutter?

Generic Programming in Go

Crypto Crash? Not Really...

A Linked List Implementation for Ethereum [Deep Dive]

“Proof-of-Nuclear-Bombs”: a most reliable design for stablecoin utility (Part I)

Doubling Down on Classic AI: Why I'm Betting on Science Over Spectacle in Business

Why is Cartesi Doubling Down on Ethereum?

"We're doubling-down on AI, on multiple fronts" says Founder & CEO of TLVTech

Looking Back at Doubling the Twitter Character Count - Looking After Number One-forty

TrustToken acquires EthWorks, Doubling its Team to Scale TrueFi

Bitcoin Doublethink.

Elliptic Curve Crypto ,Point Doubling

Adapting to AI: Insights from a Project Manager in Game Development

SDG 2025 Year in Review: A Bold Leap Into the Future of Social Discovery

Deribit and SignalPlus Launch 2025 Trading Competition, Featuring a $450,000 USDC Prize Pool

The DeFAI Crucible: Navigating Trust and Automation in a Nascent Market

Weekly AI Startup Funding: October 26 - November 1, 2025

The Hidden Economics of Reliability: Balancing Uptime, Cost, and Innovation in DevOps

Limitless Prediction Market Closes $10M Seed Round Ahead Of LMTS Token Launch

How gTrade Plans to Consolidate $113 Billion in Volume on Arbitrum With a $400,000 Trading Contest

Weekly AI Startup Funding: October 5-11, 2025

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