Senior Full Stack Engineer – Ruby /React (459)
Full time
Remote
Compensation is not specified
Role
Full-Stack Engineer
Description
Position: Senior Full Stack Engineer – Ruby / Ruby on Rails / React
Type: Remote · Full-time
Company Overview:
Our company, Ubiminds, a Great Place to Work-certified, emphasizes a people-first approach. We collaborate with American software companies to expand their development capabilities by handpicking the top 5% talent from Brazil. Through a unique blend of staff augmentation and employer-of-record services, we bolster LATAM strategies.
Job Summary:
Ubiminds is currently supporting a U.S.-based company in enlarging its engineering team with a Senior Full Stack Engineer proficient in backend and frontend tasks. Success in this role revolves around delivering secure, scalable, and top-notch software solutions.
Responsibilities:
- Develop full-stack applications using Ruby, Ruby on Rails, and React.
- Architect scalable backend services maintaining clean separation of concerns.
- Enhance user-facing features with React and work on the full SDLC in Agile, Scrum, and DevOps settings.
- Design RESTful APIs and GraphQL services while implementing and managing CI/CD pipelines.
- Conduct unit and integration tests, adhere to best security practices, and deploy and monitor applications in cloud environments.
- Collaborate with various teams for successful planning, design, and delivery.
Qualifications:
- Requires a minimum of 4 years in software engineering.
- Proficiency in Ruby, Ruby on Rails, and React.
- Strong grasp of full-stack development and modern SDLC practices.
- Experience in system design and architecture emphasizing maintainability.
- Knowledge of SQL databases, cloud platforms, REST APIs, GraphQL, MVC architecture, DevOps, CI/CD, testing, debugging, security practices, Git, and communication skills (C1 level in English).
Preferred Qualifications:
Experience in consumer credit, lending, loans, or insurance domains.
Perks @Ubiminds:
- Collaborate with U.S.-based product teams.
- Remote-first culture plus MacBook provision.
- English lessons, referral bonuses, tech talks, and continual learning initiatives.
- Comprehensive back-office support including HR, career development, and admin services.
Apply now and step into your international career as a Senior Full Stack Engineer to build end-to-end solutions using modern technologies.
Please note that in the recruitment process, artificial intelligence tools may be utilized to aid in application reviews, resume analysis, and assessment responses, though final hiring decisions are human-driven.
If you wish to know more about data processing, feel free to reach out to us.
Skills Required
Ubiminds
Website
Not specified
Company size
Not specified
Location
United States
Description
Not specified
crypto forge
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Australian, Canada +9
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Part time
Office
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Remote
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Emir Hammami
Looking for a blockchain developer
Whiteman Air Force Base, USA
Whiteman Air Force Base, USA
Full time
Remote
We are looking for a skilled Full-Stack Blockchain Developer to help maintain, improve, and extend the RaiseHive platform. This role involves working across the frontend, backend, and smart contract layers to ensure a stable, secure, and scalable Web3 application.
The ideal candidate has hands-on experience with React, Node.js, Ethereum smart contracts, and real-world Web3 integrations.
Framework: React 18.2 (Vite 3)
Styling: Tailwind CSS 3.4, NextUI
Animations: Framer Motion
Web3: Thirdweb SDK v4, Ethers.js v5
Routing: React Router DOM v6
State Management: React Context API
Libraries: React Markdown, React Image Gallery, Replyke (comments), React Toastify
Runtime: Node.js
Framework: Express.js
Database: MongoDB Atlas (Mongoose ODM)
Email: Nodemailer
Scheduling: Node-cron
Logging: Pino
Network: Ethereum
Smart Contracts: Solidity ^0.8.19
Development Tools: Hardhat
Libraries: OpenZeppelin, Thirdweb Contracts
Wallet Integration: MetaMask
Frontend
Strong proficiency in React (hooks, context, routing)
Experience with Vite or modern build tools
Solid knowledge of Tailwind CSS and responsive design
Experience using component libraries (NextUI, Material UI, etc.)
Backend
Strong experience with Node.js and Express
Proficiency with MongoDB and Mongoose
REST API design and implementation
Environment configuration and deployment awareness
Blockchain & Web3
Hands-on Ethereum development experience
Solidity smart contract development
Experience with Ethers.js / Thirdweb SDK
Understanding of smart contract security and gas optimization
MetaMask wallet integration and transaction handling
General
JavaScript (ES6+)
Git version control
Async programming and debugging skills
Strong problem-solving ability
The ideal candidate has hands-on experience with React, Node.js, Ethereum smart contracts, and real-world Web3 integrations.
Framework: React 18.2 (Vite 3)
Styling: Tailwind CSS 3.4, NextUI
Animations: Framer Motion
Web3: Thirdweb SDK v4, Ethers.js v5
Routing: React Router DOM v6
State Management: React Context API
Libraries: React Markdown, React Image Gallery, Replyke (comments), React Toastify
Runtime: Node.js
Framework: Express.js
Database: MongoDB Atlas (Mongoose ODM)
Email: Nodemailer
Scheduling: Node-cron
Logging: Pino
Network: Ethereum
Smart Contracts: Solidity ^0.8.19
Development Tools: Hardhat
Libraries: OpenZeppelin, Thirdweb Contracts
Wallet Integration: MetaMask
Frontend
Strong proficiency in React (hooks, context, routing)
Experience with Vite or modern build tools
Solid knowledge of Tailwind CSS and responsive design
Experience using component libraries (NextUI, Material UI, etc.)
Backend
Strong experience with Node.js and Express
Proficiency with MongoDB and Mongoose
REST API design and implementation
Environment configuration and deployment awareness
Blockchain & Web3
Hands-on Ethereum development experience
Solidity smart contract development
Experience with Ethers.js / Thirdweb SDK
Understanding of smart contract security and gas optimization
MetaMask wallet integration and transaction handling
General
JavaScript (ES6+)
Git version control
Async programming and debugging skills
Strong problem-solving ability
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Ahn Nahm
Rust/blockchain
Houston, USA
Houston, USA
Part time
Remote
I am seeking a world-class Systems Engineer / Rust Architect to build a proprietary asset extraction engine on the Solana network. This is not a "Web3 App" or a "DEX UI." This is a purely backend, low-latency machine designed to capture micro-value from market volatility.The system mimics a "digital sluice," using high-precision math to harvest fractional differences that standard rounded-math bots ignore. We are scaling from a prototype to a 30-node distributed network managing 100+ concurrent execution "hands."Core Technical RequirementsLow-Level Rust Mastery: You must be an expert in the Tokio runtime, asynchronous programming, and memory-safe mathematical operations.Solana Network Physics: Deep understanding of the Sealevel runtime, custom WebSocket/Lumen bridges, and avoiding gRPC bottlenecks.Jito & MEV Optimization: Proven experience with Jito Bundles, transaction shredding, and tip-optimization to ensure first-block inclusion.Distributed Orchestration: Ability to architect a master-node system that manages 30+ regional nodes with seamless failover and zero-loss state management.Precision Math: All logic must operate on u64 integers (Lamports) to avoid floating-point rounding errors. We do not "round" to the dollar; we capture the 9th decimal.Key ResponsibilitiesEngine Hardening: Audit and optimize the core Rust logic for 0-latency execution.Node Orchestration: Build the "Master Switch" to deploy, monitor, and update 30 nodes across global regions simultaneously.The "Tax" Logic: Implement a secure, automated "sweeper" protocol that collects fractional value from all child-nodes into a master treasury without interrupting execution.Redundancy: Ensure the system is "Anti-Fragile"—if a validator or node fails, the 50-drop safety protocol must trigger an instant failover.
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TA Quant
Frontend Developer
Full time
Remote
Create intuitive, responsive user interfaces that deliver exceptional user experiences across our platform. You'll transform designs into pixel-perfect, performant applications while ensuring smooth interactions and real-time data visualization. We're looking for developers who are passionate about user experience, have an eye for design details, and can build complex web applications that handle large datasets efficiently while maintaining responsive, accessible interfaces across all devices and browsers.
Responsibilities:
Build responsive, performant web applications
Implement designs with attention to UX detail
Integrate with backend APIs and manage application state
Ensure cross-browser compatibility and accessibility
Responsibilities:
Build responsive, performant web applications
Implement designs with attention to UX detail
Integrate with backend APIs and manage application state
Ensure cross-browser compatibility and accessibility
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