Staff Software Engineer - Ruby on Rails/React (403)
Full time
Remote
Compensation is not specified
Role
Software Engineer
Description
Overview
Join a dynamic team at Ubiminds, where we prioritize creating rewarding international career opportunities. We are a people-first organization, empowering American software product companies to expand their development capabilities with top-tier talent in Brazil. Currently, we are collaborating with a company focused on revolutionizing Public Safety through an innovative product suite.
Responsibilities
- Lead the enhancement of a sophisticated healthcare data platform and member management solution for prominent health insurers and benefits providers.
- Develop, maintain, and optimize APIs and backend systems supporting a large-scale healthcare data platform.
- Contribute to frontend projects using modern technologies like React, TypeScript, and other cutting-edge tools.
- Collaborate closely with cross-functional teams to drive scalable solutions aligned with product goals.
- Uphold best practices such as test-driven development, pair programming, and code reviews to ensure code quality.
- Enhance team efficiency through mentoring, documentation, and process enhancement.
- Engage in architectural discussions to shape the platform's technical design and performance.
Requirements
Essential Skills
- Extensive software engineering experience.
- Proficiency in Ruby and the Rails framework.
- Strong background in API design, including REST or GraphQL.
- Knowledge of frontend technologies like React, TypeScript, TailwindCSS, and Vite.
- Deep understanding of relational databases, such as PostgreSQL, and indexing techniques.
- Familiarity with Redis, AWS S3, and ElasticSearch.
- Excellent communication skills and ability to thrive in team-oriented environments.
- Commitment to producing maintainable, well-tested code with a focus on quality.
Preferred Skills
- Familiarity with Rust (not mandatory).
- Experience with DevOps tools like Docker, Kubernetes, Helm, and Terraform.
- Exposure to observability tools such as Datadog.
- Proficiency in performance monitoring, incident management, and CI/CD optimization.
- Background in infrastructure-heavy products or large-scale distributed systems.
About Ubiminds
Culture
- Emphasizes a 'People First' approach.
- Promotes continuous self-improvement and overcoming challenges.
- Encourages proactive problem-solving and a team-centric work environment.
- Strives for excellence in service delivery and exceeding expectations.
- Values honesty, transparency, and openness in all interactions.
Perks
- Assigned to work within a product-based organization with equal treatment as full-time employees.
- Provided full support from our back-office team, including career guidance and HR services.
- Embrace a remote-first work environment with distributed team members.
- Receive a company-provided MacBook.
- Access growth opportunities through knowledge-sharing sessions with industry professionals.
- Enhance English communication skills through complimentary lessons with a native speaker.
- Enjoy benefits such as a candidate referral bonus and optional office perks at our Florianópolis headquarters.
Skills Required
Ubiminds
Website
Not specified
Company size
Not specified
Location
United States
Description
Not specified
Winnables
Full Stack Developer (Front End Leaning)
Full time
Remote
Job Description:
Winnables.com is looking for a creative front-end-leaning Full Stack Developer who loves bringing slick, engaging user experiences to life while still caring about the behind-the-scenes details.
You’ll collaborate closely with designers and product leads, iterate quickly on new ideas, and see the direct impact of your work in the hands of players around the world.
If you enjoy mixing imaginative front-end polish with just enough back-end know-how to make the magic happen, we’d love to hear from you.
Key Responsabilities:
Transform design mock-ups and product concepts into polished, responsive game screens, animations, and flows.
Collaborate daily with designers, product leads, and blockchain engineers to prototype, ship, and iterate on new games or new features.
Continuously test, debug, and optimize for performance across devices and network conditions.
Review code, share best practices, and help keep our small codebase clean, secure, and easy to extend.
Use player feedback and analytics to refine existing features and guide new ideas from concept to launch.
Champion accessibility and web-standards compliance, ensuring every player—regardless of device or ability—has a first-class experience.
What You’ll Be Building
Build interactive mini-games that deliver smooth, responsive gameplay.
Create real-time multiplayer features and live game mechanics.
Develop pack-opening systems with eye-catching, engaging animations.
Engineer raffle and lottery-style games that are fully on-chain and provably fair.
Implement Plinko and other physics-based games, tuned for fun and balance.
Craft user-friendly interfaces that perform flawlessly across mobile, tablet, and desktop.
Qualifications:
Tech Stack:
Core: TypeScript · React & Next.js · Node.js · Zustand · WebSockets & REST
Data & Infra: PostgreSQL (Supabase) · Redis · Docker · GitHub
Observability: Grafana · PostHog
Design & Web3: Figma · viem / wagmi
What We're Looking For
Strong experience with TypeScript and modern JavaScript
Solid understanding of React and Next.js ecosystem
Experience building real-time applications with WebSockets
Familiarity with Node.js backend development
Knowledge of PostgreSQL and database design
Experience with responsive design and mobile-first development
Understanding of state management patterns (Zustand experience preferred)
Understanding of web security fundamentals (CSRF protection, secure authentication flows, input validation)
Interest in gaming mechanics and interactive user experience.
Nice to Have
Experience with gaming or interactive application development
Knowledge of blockchain technologies and Web3 integration
Familiarity with monitoring tools (Grafana, PostHog)
Experience with Docker and containerization
Understanding of real-time multiplayer game architecture
Company Description:
Winnables.com is on a mission to re-imagine iGaming through full on-chain transparency. We believe players deserve provably fair odds, transparent math, and no black-box RNGs. Every spin and ticket purchase is recorded immutably on Ethereum, so anyone can audit the outcome, track prize pools, or even build their own analytics on top of our contracts.
All of our games are designed and engineered 100% in-house by a small, senior team that blends game design, cryptography, and smart-contract security. We currently operate two flagship experiences:
Raffles – transparent prize drawings where every ticket lives on-chain, letting players verify fairness before and after the draw.
Loot Packs – blockchain-powered loot boxes that reveal randomized rewards with engaging pack-opening animations.
We’re still just getting started. The roadmap is full of green-field challenges—and real, measurable impact on an industry ripe for change. Join us and help craft the next generation of fair, fun, and truly player-owned gaming.
Winnables.com is looking for a creative front-end-leaning Full Stack Developer who loves bringing slick, engaging user experiences to life while still caring about the behind-the-scenes details.
You’ll collaborate closely with designers and product leads, iterate quickly on new ideas, and see the direct impact of your work in the hands of players around the world.
If you enjoy mixing imaginative front-end polish with just enough back-end know-how to make the magic happen, we’d love to hear from you.
Key Responsabilities:
Transform design mock-ups and product concepts into polished, responsive game screens, animations, and flows.
Collaborate daily with designers, product leads, and blockchain engineers to prototype, ship, and iterate on new games or new features.
Continuously test, debug, and optimize for performance across devices and network conditions.
Review code, share best practices, and help keep our small codebase clean, secure, and easy to extend.
Use player feedback and analytics to refine existing features and guide new ideas from concept to launch.
Champion accessibility and web-standards compliance, ensuring every player—regardless of device or ability—has a first-class experience.
What You’ll Be Building
Build interactive mini-games that deliver smooth, responsive gameplay.
Create real-time multiplayer features and live game mechanics.
Develop pack-opening systems with eye-catching, engaging animations.
Engineer raffle and lottery-style games that are fully on-chain and provably fair.
Implement Plinko and other physics-based games, tuned for fun and balance.
Craft user-friendly interfaces that perform flawlessly across mobile, tablet, and desktop.
Qualifications:
Tech Stack:
Core: TypeScript · React & Next.js · Node.js · Zustand · WebSockets & REST
Data & Infra: PostgreSQL (Supabase) · Redis · Docker · GitHub
Observability: Grafana · PostHog
Design & Web3: Figma · viem / wagmi
What We're Looking For
Strong experience with TypeScript and modern JavaScript
Solid understanding of React and Next.js ecosystem
Experience building real-time applications with WebSockets
Familiarity with Node.js backend development
Knowledge of PostgreSQL and database design
Experience with responsive design and mobile-first development
Understanding of state management patterns (Zustand experience preferred)
Understanding of web security fundamentals (CSRF protection, secure authentication flows, input validation)
Interest in gaming mechanics and interactive user experience.
Nice to Have
Experience with gaming or interactive application development
Knowledge of blockchain technologies and Web3 integration
Familiarity with monitoring tools (Grafana, PostHog)
Experience with Docker and containerization
Understanding of real-time multiplayer game architecture
Company Description:
Winnables.com is on a mission to re-imagine iGaming through full on-chain transparency. We believe players deserve provably fair odds, transparent math, and no black-box RNGs. Every spin and ticket purchase is recorded immutably on Ethereum, so anyone can audit the outcome, track prize pools, or even build their own analytics on top of our contracts.
All of our games are designed and engineered 100% in-house by a small, senior team that blends game design, cryptography, and smart-contract security. We currently operate two flagship experiences:
Raffles – transparent prize drawings where every ticket lives on-chain, letting players verify fairness before and after the draw.
Loot Packs – blockchain-powered loot boxes that reveal randomized rewards with engaging pack-opening animations.
We’re still just getting started. The roadmap is full of green-field challenges—and real, measurable impact on an industry ripe for change. Join us and help craft the next generation of fair, fun, and truly player-owned gaming.
Jack Milton
Full Stack Developer (Web3/Crypto)
London, UK
London, UK
Full time
Remote
We're hiring a full stack developer to help build a suite of Web3 products - lightweight tools designed to scale fast. You’ll work directly with the founding team to ship high-impact tools used by founders, investors, and crypto communities.
Over the next 4–6 months, we’re rolling out four standalone products - including a Web3 project directory, a community engagement platform, and other tools designed to drive discovery and visibility across the space. You’ll have end-to-end ownership of what you ship.
Tech Stack & Skills:
React / Next.js or similar (full stack comfort)
Node.js, Firebase, or lightweight backend setups
CMS integration (Sanity, Notion, Airtable, etc.)
REST APIs, data scraping, automation
Strong grasp of Web3 (tokens, on-chain data, dApps)
Bonus: Vercel, CoinMarketCap API, any Web3 SDKs
Who this is for:
You’ve built and shipped products solo or with small teams
You’re crypto-native and enjoy exploring new tools/protocols
You’re fast, self-driven, and prefer ownership to micromanagement
You write clean code but iterate quickly
What Success Looks Like (First 60 Days)
Launch 1–2 working products with CMS and frontend live
Build automation for token sourcing + database updates
Deliver clean UIs with fast-loading pages and working filters
Support backend tools for campaign dashboards or scraping
Details
Full-time (contractor, with option to go permanent)
Remote + async (Europe/Asia timezone preferred)
Competitive base + performance bonuses
No corporate fluff - just fast builds, useful products, and full ownership
To apply:
Send GitHub, portfolio, or 1–2 examples of tools you’ve built solo or in a small team - especially anything Web3-related.
Over the next 4–6 months, we’re rolling out four standalone products - including a Web3 project directory, a community engagement platform, and other tools designed to drive discovery and visibility across the space. You’ll have end-to-end ownership of what you ship.
Tech Stack & Skills:
React / Next.js or similar (full stack comfort)
Node.js, Firebase, or lightweight backend setups
CMS integration (Sanity, Notion, Airtable, etc.)
REST APIs, data scraping, automation
Strong grasp of Web3 (tokens, on-chain data, dApps)
Bonus: Vercel, CoinMarketCap API, any Web3 SDKs
Who this is for:
You’ve built and shipped products solo or with small teams
You’re crypto-native and enjoy exploring new tools/protocols
You’re fast, self-driven, and prefer ownership to micromanagement
You write clean code but iterate quickly
What Success Looks Like (First 60 Days)
Launch 1–2 working products with CMS and frontend live
Build automation for token sourcing + database updates
Deliver clean UIs with fast-loading pages and working filters
Support backend tools for campaign dashboards or scraping
Details
Full-time (contractor, with option to go permanent)
Remote + async (Europe/Asia timezone preferred)
Competitive base + performance bonuses
No corporate fluff - just fast builds, useful products, and full ownership
To apply:
Send GitHub, portfolio, or 1–2 examples of tools you’ve built solo or in a small team - especially anything Web3-related.
Payment in Crypto
berttha walker
UI/UX Designer
Full time
Remote
UI/UX Designer for SaaS Dashboard (Figma)
Job Summary:
We're building ClearTrack, a lightweight SaaS tool for tracking tasks and performance in remote teams. We're looking for a UI/UX designer to design 6–8 clean, modern dashboard screens (desktop + mobile).
Scope of Work:
1. Design dashboard UI (Task List, Time Tracker, Reports, Settings)
2. Create responsive mockups in Figma
3. Deliver clickable prototype + style guide
4. Collaborate with our developer for smooth handoff
Budget:
Fixed: $800–$1200 (negotiable based on experience)
Requirements:
1. SaaS/dashboard UI design experience
2. Proficiency in Figma
3. Strong communication & fast turnaround
To Apply:
If you're interested, please:
1. Send a short proposal letter explaining why you're a good fit
2. Share your portfolio (SaaS/dashboard preferred)
3. Include your email address
4. Mention your availability and estimated delivery time
Bonus if you have:
Experience designing admin panels or productivity tools
Job Summary:
We're building ClearTrack, a lightweight SaaS tool for tracking tasks and performance in remote teams. We're looking for a UI/UX designer to design 6–8 clean, modern dashboard screens (desktop + mobile).
Scope of Work:
1. Design dashboard UI (Task List, Time Tracker, Reports, Settings)
2. Create responsive mockups in Figma
3. Deliver clickable prototype + style guide
4. Collaborate with our developer for smooth handoff
Budget:
Fixed: $800–$1200 (negotiable based on experience)
Requirements:
1. SaaS/dashboard UI design experience
2. Proficiency in Figma
3. Strong communication & fast turnaround
To Apply:
If you're interested, please:
1. Send a short proposal letter explaining why you're a good fit
2. Share your portfolio (SaaS/dashboard preferred)
3. Include your email address
4. Mention your availability and estimated delivery time
Bonus if you have:
Experience designing admin panels or productivity tools
Payment in Crypto
Jack Morty
Project Manager / Coordinator
Part time
Remote
We’re looking for a Project Coordinator to join LeadWave Group, a growing startup in the SEO & affiliate space.
Our team is already working on our first product, and we need someone to help organize workflows, tasks, and team communication.
Responsibilities:
🔹 Manage task boards (Trello/ClickUp) and monitor progress
🔹 Assign tasks to SEO, designers, researchers, copywriters
🔹 Help the founder plan weekly/monthly sprints
🔹 Track deadlines and team priorities
🔹 Coordinate communication via Discord/Telegram
🔹 Maintain documentation and workflows in Notion
Format:
🔸 Remote
🔸 Part-time (5–10 hrs/week)
🔸 Initially unpaid (pre-revenue), with transition to paid/fixed/percentage model
🔸 Flexible hours, informal startup environment
🔸 Opportunity to grow into a full Product Manager role
Requirements:
Experience in coordinating small teams or organizing workflows
Familiar with Trello, Notion, ClickUp, or similar tools
Strong communication and self-management skills
Bonus: basic understanding of SEO/digital projects
English: able to read and write messages
Our team is already working on our first product, and we need someone to help organize workflows, tasks, and team communication.
Responsibilities:
🔹 Manage task boards (Trello/ClickUp) and monitor progress
🔹 Assign tasks to SEO, designers, researchers, copywriters
🔹 Help the founder plan weekly/monthly sprints
🔹 Track deadlines and team priorities
🔹 Coordinate communication via Discord/Telegram
🔹 Maintain documentation and workflows in Notion
Format:
🔸 Remote
🔸 Part-time (5–10 hrs/week)
🔸 Initially unpaid (pre-revenue), with transition to paid/fixed/percentage model
🔸 Flexible hours, informal startup environment
🔸 Opportunity to grow into a full Product Manager role
Requirements:
Experience in coordinating small teams or organizing workflows
Familiar with Trello, Notion, ClickUp, or similar tools
Strong communication and self-management skills
Bonus: basic understanding of SEO/digital projects
English: able to read and write messages
Jack Morty
SEO Specialist
Part time
Remote
We’re hiring an SEO Specialist to join LeadWave Group — a startup in the iGaming niche.
We already have our first product live and are preparing to scale.
Responsibilities:
🔹 Keyword research
🔹 On-page optimization for UK market
🔹 SEO briefs for copywriters
🔹 Performance tracking via Search Console, Ahrefs
Format:
🔸 Remote
🔸 Part-time
🔸 Unpaid during pre-revenue stage, with transition to paid once monetized
Requirements:
Solid understanding of SEO basics (on-page, off-page, technical)
Experience with tools like Google Search Console, Ahrefs, or similar
Ability to perform keyword research and cluster keywords
Skills in optimizing meta tags, headings, and website structure
Basic knowledge of Google algorithms and ranking factors
Experience with English-language websites or willingness to learn
Ability to work independently and manage your own time
English level: able to understand search queries and work with keyword data
We already have our first product live and are preparing to scale.
Responsibilities:
🔹 Keyword research
🔹 On-page optimization for UK market
🔹 SEO briefs for copywriters
🔹 Performance tracking via Search Console, Ahrefs
Format:
🔸 Remote
🔸 Part-time
🔸 Unpaid during pre-revenue stage, with transition to paid once monetized
Requirements:
Solid understanding of SEO basics (on-page, off-page, technical)
Experience with tools like Google Search Console, Ahrefs, or similar
Ability to perform keyword research and cluster keywords
Skills in optimizing meta tags, headings, and website structure
Basic knowledge of Google algorithms and ranking factors
Experience with English-language websites or willingness to learn
Ability to work independently and manage your own time
English level: able to understand search queries and work with keyword data
Payment in Crypto