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Hi there! We're Rumble Fish - a team of world-class experts in bespoke software development. Our engineers are highly skilled in blockchain, cloud solutions, and defi/fintech development. Our strength and pride is the ability to take ownership of the entire development process and be a true partner and advisor for our customers. Our mission is to craft state-of-the-art digital products using battle-tested technologies. Try us!

40uniquely skilled devs

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8years in business

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Software Development Services and Skills for your needs To deliver the highest quality of services, our experts are always gaining new skills and knowledge. That’s how we make sure our solutions follow the latest industry standards and take advantage of the most innovative technologies.

Our team is well-versed and experienced in various blockchain development tools and technologies. Our unique skillset allows us to be at the forefront of Web3 development services so if you’re looking for a trusted IT partner to boost your decentralized product - look no further!

We deliver production-ready zero-knowledge proof solutions that actually ship to mainnet, specializing in custom ZK development, rollup scaling solutions, and privacy-preserving smart contracts that reduce processing times from hours to minutes. Try us!

We build fast, compliant, and cost-effective blockchain solutions on the XRP Ledger. From payment systems and tokenization platforms to enterprise DeFi applications, our team delivers production-ready systems that work when billions are on the line.

We build smart contracts that handle real business complexity without the usual blockchain headaches. From DeFi protocols to custom on-chain systems, we deliver production-ready solutions that scale.

Decentralized Finance (DeFi) development requires an extensive amount of blockchain knowledge, as well as a great understanding of financial mechanisms. We’ve got both that bases covered! Our team has successfully built an impressive number of DeFi products like cryptocurrency exchanges, dApps, lending protocols, or staking platforms. Try us!

Our experienced team will take your AWS cloud solutions to the next level. AWS provides purpose-built tools to support your needs, and it is the preferred choice for any blockchain project. From the plethora of cloud tools and solutions offered by Amazon Web Services, we’ll help you choose and implement the ones that serve your business the best way possible.

AI chatbots can bring value to a wide range of industries by enhancing customer interactions, streamlining processes, and improving overall efficiency. We'll craft a perfect AI assistant for your product.

Need realistic data for AI training, testing, or product development—but privacy, scale, or availability is blocking you? We engineer custom synthetic data solutions that capture the complexity of real-world data without the constraints. From multi-modal generation to domain-specific datasets, we build what platforms can't deliver.

We build custom AI knowledge management systems that turn your scattered enterprise knowledge into instant, accurate answers - no more employees wasting their valuable time hunting through SharePoint and Slack for information. Unlike platforms that trap you in subscriptions, we engineer RAG solutions specifically for your data and security requirements, then hand you complete ownership of the source code and infrastructure.

Looking for a skilled team to help you build an advanced fintech platform able to compete with the biggest in the game? At Rumble Fish, we’ve got what it takes to engineer innovative financial technology systems. We offer end-to-end fintech software development, consulting, and expertise.

Our experts provide you with knowledge, skills, and experience that elevates every project to another level. We’ll gladly take ownership of the entire process and guide you and your team through the intricacies of cutting-edge technology development.

If you’re in need of professional web development services, look no further! Rumble Fish's talented team has extensive experience in delivering top-tier web apps and websites with the use of battle-tested tools and technologies like React or Nest. We know just the right solutions to exceed your business requirements.

Whether you need an Android, an IOS app, or both, the Rumble Fish team is here to help you deliver the beautiful and efficient mobile product that your customers will simply love to use! We craft fast and secure mobile apps with a wow factor to help our customers grow their businesses and reach their goals quicker.

If you're looking for a team capable of turning your product concept into a beautiful and technologically intricate digital solution - look no further! Rumble Fish is your trusted software development partner ready to take you through the entire process of custom digital product creation - from the early stages of ideation to the post-launch support. Whether you're on a mission to build a mobile app, a Web3 product, or an advanced platform - we are here for you!

We design sleek, intuitive, and highly effective interfaces to help you overcome your business challenges. After carefully evaluating and understanding your requirements we switch to the designing mode - the end goal is the beautiful digital solution that people love to use!

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Latest case studyPorting Merkl to Stellar: Full Protocol Migration to Soroban

Porting Merkl to Stellar: Full Protocol Migration to Soroban

Merkl is the leading DeFi incentive distribution platform, backed by a16z, that has distributed over $1.5 billion in rewards across 60+ chains for 200+ protocols.

Collaboration timeframe:4 weeks

Services:Smart Contract Development, Blockchain Development

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A hybrid of a social network and a music app

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A private inbox, wallet, and marketplace all in one

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VERIFYID

An identity verification MVP

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From Block Explorer to Prices API: Rumble Fish Receives Its Second Stellar Community Fund Grant

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By Agnieszka Dobosz

We're excited to announce that Rumble Fish has been awarded a $55,000 grant from the Stellar Community Fund (SCF #42) to build a Prices API - a unified, standardized data infrastructure layer for real-time and historical price information across all Stellar assets, both classic and SEP-41 Soroban tokens. This is our second grant from the Stellar Community Fund, following the $131,200 award from SCF #41 to build the Soroban-first Block Explorer. Together, they reflect a clear direction: Rumble Fish is here to build the infrastructure that makes the Stellar ecosystem stronger, more transparent, and more developer-friendly. ## What Problem Are We Solving? Today, price data on Stellar is scattered. Different applications pull from different sources, use different formats, and cover different assets, creating a fragmented landscape that makes life harder for everyone building on the network. For a DeFi protocol, this means unreliable inputs that can affect the accuracy of trades and liquidity calculations. For a portfolio tracking tool, it means incomplete or inconsistent data that erodes user trust. For a developer building anything price-sensitive, it means spending weeks solving an infrastructure problem that should already be solved. The Prices API is built to eliminate that fragmentation, providing a single, standardized source of price data covering all Stellar assets, both classic and Soroban-based. ## What the Team Says Marek Kowalski, CEO of Rumble Fish, sees the Prices API as a natural complement to the team's broader work in the Stellar ecosystem: #### "Price data is one of those things that every serious DeFi application needs, but that nobody wants to build from scratch. The fragmentation on Stellar today creates real friction for developers. With this API, we're building something that can become shared infrastructure for the whole ecosystem." ## What This Means for the Stellar Ecosystem Price data infrastructure might not be the most visible part of a blockchain ecosystem, but it's one of the most critical. Every DeFi protocol, every analytics dashboard, every portfolio application depends on it. When that layer is fragmented and unreliable, the applications built on top of it suffer - and so does adoption. By delivering a unified Prices API with 8+ years of historical coverage, real-time ingestion, and production-grade reliability, Rumble Fish is giving Stellar developers a foundation they can actually build on. The kind of infrastructure that turns good ideas into real products. You can explore the full architecture documentation on [GitHub](https://github.com/rumblefishdev/stellar-scf-submissions/blob/master/prices-api-design-after-2nd-review.md) and track the project's progress on the [Stellar Community Fund](https://communityfund.stellar.org/submissions/rec0QBqMONJbGabzq). If you're building on Stellar and need a technical partner who knows the ecosystem inside out, our team is ready to help - [get in touch](https://www.rumblefish.dev/contact/).

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Rumble Fish Awarded a Grant by Stellar Community Fund to Build Soroban-First Block Explorer

By Agnieszka Dobosz

We're thrilled to announce that Rumble Fish has been awarded a **$131,200 grant** from the **Stellar Community Fund** (SCF #41) to build a **Soroban-first Block Explorer,** a tool designed to bring full transparency to the Soroban smart contract ecosystem on the Stellar network. ## What Is the Stellar Community Fund? [The Stellar Community Fund](https://communityfund.stellar.org/) is an initiative by the Stellar Development Foundation that supports developers, startups, and companies building on Stellar and Soroban. Each funding round allocates resources to projects that strengthen and grow the ecosystem. Being selected is both a validation of technical capability and a signal of trust from one of the most established names in blockchain infrastructure. ## Why Does Soroban Need Its Own Block Explorer? **Soroban is Stellar's smart contract platform** - the layer that enables decentralized finance (DeFi), collectibles trading, and a new generation of on-chain applications. While classic Stellar assets have solid support across existing block explorers, Soroban has been significantly underserved. Current block explorers display Soroban events and transactions in raw, technical formats - often unreadable to folks without deep protocol knowledge. This creates friction for everyone: developers debugging contracts, investors tracking DeFi activity, and users simply trying to understand what an application did with their funds. A block explorer that displays Soroban operations in human-readable, context-rich formats improves the user experience and builds trust, both of which are essential to driving further adoption. ## What Are We Building? **The Soroban-first Block Explorer** is a full-stack infrastructure project, delivered in three phases. The first phase, the MVP, focuses on ingesting and indexing all on-chain data: ledgers, transactions, Soroban smart contract invocations, and CAP-67 events, stored in a PostgreSQL database and served via a NestJS API. The second phase brings that data to life through a public React-based frontend with transaction detail pages, account views, contract pages, and global search - all displaying live mainnet data, with Soroban events decoded into clean tables rather than raw XDR. The third and final phase is a production-grade deployment: security-audited, load-tested (targeting p95 response times under 200ms), fully documented, and monitored, ensuring reliability from day one. The entire architecture runs on AWS, with infrastructure-as-code via AWS CDK and CI/CD through GitHub Actions. ## What the Team Says Marek Kowalski, CEO/CTO of Rumble Fish, sees this grant as a natural next step for the company's presence in the Stellar ecosystem: #### _“Soroban is where the most exciting things on Stellar are happening right now - DeFi, new token standards, complex smart contract interactions. But if users and developers can't clearly see what's going on-chain, adoption stalls. We're building this block explorer because the ecosystem needs it, and because **it's exactly the kind of infrastructure challenge our team is built for**.”_ ## What This Means for the Stellar Ecosystem Block explorers are often the first point of contact between a user and a blockchain network. They're how you verify a transaction went through, how a developer confirms a smart contract behaved as expected, and how an investor tracks on-chain activity. When that tool doesn't fully support the newest and most powerful features of a network, the whole ecosystem pays the price. By building a Soroban-first block explorer, Rumble Fish is filling a critical gap - one that will **make Stellar more accessible, more transparent, and more compelling** for the next wave of builders and users entering the space. You can explore our full architecture documentation on [GitHub](https://github.com/rumblefishdev/stellar-scf-submissions/blob/master/soroban-first-block-explorer-after-review.md) and track the project's progress on the [Stellar Community Fund](https://communityfund.stellar.org/submissions/recIEUbnDA95HE2Qn). If you're building on Stellar or Soroban and looking for an experienced technical partner, our team is ready to help - we welcome you to [get in touch](https://www.rumblefish.dev/contact).

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