Senior Backend QA Engineer
Singapore
Full time
Hybrid
Compensation is not specified
Role
QA Engineer
Description
We are seeking a talented individual to join our team responsible for designing, developing, maintaining, and enhancing software for various ventures projects closely linked to our core businesses. These projects are rapidly developed with lean teams. You will play a key role in designing components for scalable applications, spanning from frontend UI to backend infrastructure.
Responsibilities
- Conduct code and test design reviews collaboratively with backend feature teams to formulate exhaustive testing strategies, ensuring robust coverage of critical business flows and promoting a test-first development approach.
- Review automated test scenarios for backend services and APIs to validate business logic effectively.
- Assess the testability of backend codebases and ensure scenario coverage completeness, offering actionable feedback for enhancing quality practices and maintaining consistent standards across teams.
- Manage test case execution for backend services, monitor and analyze test results, and report on test and defect metrics to enhance quality continuously.
- Lead the planning and execution of performance testing strategies, guaranteeing the scalability of backend services under high load and production-like conditions.
- Contribute to security testing efforts, including API vulnerability assessment and data protection validation, to reinforce overall system reliability.
- Develop, maintain, and enhance test frameworks, tools, and technologies organization-wide to uphold high quality standards consistently.
- Act as a technical liaison between QA and backend engineering teams, facilitating the translation of testing requirements across various technology stacks, ensuring uniform quality practices, and fostering a culture of quality excellence company-wide.
Requirements
- Proficient in comprehending Ruby on Rails and Golang codebases, with hands-on implementation experience as a bonus.
- Strong understanding of backend architecture patterns, microservices, and challenges in testing distributed systems.
- Familiarity with technologies like PostgreSQL, Kafka, RabbitMQ, Redis, etc.
- Ability to translate functional requirements and use cases into effective test plans and cases for backend systems.
- Strong customer orientation, exceptional problem-solving skills, and analytical abilities.
- Familiarity with performance testing tools and methodologies to design and analyze load and stress tests.
- Excellent verbal and written communication skills to collaborate effectively across technical teams.
- Enthusiasm for enhancing code quality through proactive engagement with the development team.
- Expertise in automation testing of RESTful and WebSocket APIs, utilizing frameworks like Pytest and tools such as Postman.
- Fluency in English and Mandarin (both written and spoken) is mandatory, with Cantonese proficiency considered advantageous.
Benefits
- Competitive salary.
- Generous annual leave entitlement, inclusive of birthday and work anniversary days off.
- Flexibility in work arrangements, incorporating flexi-work hours and hybrid or remote setups.
- Opportunities for career advancement through an internal mobility program.
- Encouragement of personal and professional growth through skill development initiatives.
- Work perks include the provision of a crypto.com visa card upon joining.
About the Company
Founded in 2016, our organization serves over 80 million customers and is recognized as the world's fastest-growing global cryptocurrency platform, with a simple vision of making cryptocurrency accessible to all. Built on pillars of security, privacy, and compliance, we are dedicated to accelerating cryptocurrency adoption through innovation. We are committed to nurturing a culture of diversity and inclusion, welcoming candidates of varied backgrounds, perspectives, and skills to strengthen our team.
Personal data provided by applicants shall be used solely for recruitment purposes, and only shortlisted candidates will be contacted for further steps.
Skills Required
Сrypto.com
Website
Сrypto.comCompany size
Not specified
Location
United States
Description
Not specified
George I
Game Studio Hiring: Full-Stack, Mobile & 3D Web Developers
Part time
Remote
About Us
We are an established game studio developing HeroWarrior, a Unity-based web battle game that has been in active development for three years. Our project is supported by GameWorld (Netherlands) and we're currently preparing for version 2.0 with an expanded development team.
Following strategic restructuring in 2022, we're now building a distributed team across Europe and seeking talented developers to join our long-term project.
Open Positions
We are actively recruiting for the following roles:
UI/UX Designer
Specialization in gaming interface design
Experience with Unity UI systems preferred
Full-Stack Developers
Backend and frontend development for web platform
Experience with game-related web services preferred
Mobile Developers
Native mobile app development
Cross-platform experience valued
Unity Developers
Gameplay mechanics implementation
3+ years Unity experience required
3D Web Developers
WebGL and Three.js expertise
Browser-based 3D rendering experience
hat We Offer
Project Commitment: We're seeking long-term partnerships, not short-term contractors. This is an opportunity to grow with an established project backed by industry partners.
Compensation Structure:
Flexible payment options: hourly rates, monthly retainers, or milestone-based compensation
Rates negotiable based on experience and role
Initial evaluation period followed by standard employment terms
Work Environment:
Remote-friendly distributed team
Collaborative development process
Opportunity to work on a commercially-backed game project
Application Requirements
Please submit the following:
Portfolio/Resume - Detailed work history and relevant projects
Rate Expectations - Your preferred compensation structure and rates
Code Samples - GitHub repository, portfolio links, or previous work examples
Availability - Expected start date and commitment level
Evaluation Process Acknowledgment - Confirmation of willingness to complete a brief technical assessment
Ideal Candidates
Demonstrated passion for game development
Strong technical skills in relevant technologies
Experience working on long-term projects
Collaborative mindset and professional communication
Interest in building innovative gaming experiences
Next Steps
We are moving quickly to fill these positions. Qualified candidates will be contacted within one week for initial discussions and technical evaluation.
To apply, please send your complete application materials to vlad@gameworldcompany.com
We are an established game studio developing HeroWarrior, a Unity-based web battle game that has been in active development for three years. Our project is supported by GameWorld (Netherlands) and we're currently preparing for version 2.0 with an expanded development team.
Following strategic restructuring in 2022, we're now building a distributed team across Europe and seeking talented developers to join our long-term project.
Open Positions
We are actively recruiting for the following roles:
UI/UX Designer
Specialization in gaming interface design
Experience with Unity UI systems preferred
Full-Stack Developers
Backend and frontend development for web platform
Experience with game-related web services preferred
Mobile Developers
Native mobile app development
Cross-platform experience valued
Unity Developers
Gameplay mechanics implementation
3+ years Unity experience required
3D Web Developers
WebGL and Three.js expertise
Browser-based 3D rendering experience
hat We Offer
Project Commitment: We're seeking long-term partnerships, not short-term contractors. This is an opportunity to grow with an established project backed by industry partners.
Compensation Structure:
Flexible payment options: hourly rates, monthly retainers, or milestone-based compensation
Rates negotiable based on experience and role
Initial evaluation period followed by standard employment terms
Work Environment:
Remote-friendly distributed team
Collaborative development process
Opportunity to work on a commercially-backed game project
Application Requirements
Please submit the following:
Portfolio/Resume - Detailed work history and relevant projects
Rate Expectations - Your preferred compensation structure and rates
Code Samples - GitHub repository, portfolio links, or previous work examples
Availability - Expected start date and commitment level
Evaluation Process Acknowledgment - Confirmation of willingness to complete a brief technical assessment
Ideal Candidates
Demonstrated passion for game development
Strong technical skills in relevant technologies
Experience working on long-term projects
Collaborative mindset and professional communication
Interest in building innovative gaming experiences
Next Steps
We are moving quickly to fill these positions. Qualified candidates will be contacted within one week for initial discussions and technical evaluation.
To apply, please send your complete application materials to vlad@gameworldcompany.com
Payment in Crypto
Bitget
P2P Operations Specialist, APAC (Remote)
Full time
Remote
About us
Bitget is one of the world's leading digital assets ecosystems. With over 120 million registered users, Bitget has one of the most comprehensive suites of blockchain products and services available.
Our mission is to support the growth of the digital assets industry and we believe it represents the future of finance. What we do empowers the future of finance by ensuring secure, efficient and smart digital transactions.
We are one of the fastest growing companies in the digital asset sector. If you are looking for cutting-edge work, where you will have opportunities to develop your career among peers who are experts in their field, and you believe in the future of digital currency, then look no further than Bitget!
What you'll do
User Experience Optimization: Identify pain points and opportunities in P2P transaction processes to enhance user experience.
Risk Management: Implement and oversee fraud prevention strategies to ensure compliance with regulatory and internal requirements.
Data Analysis: Track and analyze key performance indicators KPI to pinpoint issues. - Collaboration: Partner with product, marketing, and technical teams to drive the launch of new features and ensure the platform evolves to meet market demands.
User Support: Maintain communication with the customer service team to establish SOPs for issue resolution and reduce customer complaint rates.
What you'll need
At least 2+ years of P2P operations experience; ideally with experience in cryptocurrency or fintech sectors.
Strong analytical thinking skills, with the ability to interpret data and make data-driven decisions.
Excellent communication and problem-solving abilities.
Exceptional verbal and written communication skills (proficient in both Mandarin and English).
Why Bitget?
Bitget is the world's leading web 3 platform for copy trading and one of the world's largest and most respected exchanges
We are a global company with staff members from over 50 different countries and regions
We are growing and looking for world-class ambitious talents to help us continue this journey
We have a streamlined structure that empowers employees to work efficiently, delivering the best results in a short timeframe
We offer competitive salaries and benefits
Blockchain technology and digital assets have the potential to change finance in a way no other technology can - be part of it!
Bitget is one of the world's leading digital assets ecosystems. With over 120 million registered users, Bitget has one of the most comprehensive suites of blockchain products and services available.
Our mission is to support the growth of the digital assets industry and we believe it represents the future of finance. What we do empowers the future of finance by ensuring secure, efficient and smart digital transactions.
We are one of the fastest growing companies in the digital asset sector. If you are looking for cutting-edge work, where you will have opportunities to develop your career among peers who are experts in their field, and you believe in the future of digital currency, then look no further than Bitget!
What you'll do
User Experience Optimization: Identify pain points and opportunities in P2P transaction processes to enhance user experience.
Risk Management: Implement and oversee fraud prevention strategies to ensure compliance with regulatory and internal requirements.
Data Analysis: Track and analyze key performance indicators KPI to pinpoint issues. - Collaboration: Partner with product, marketing, and technical teams to drive the launch of new features and ensure the platform evolves to meet market demands.
User Support: Maintain communication with the customer service team to establish SOPs for issue resolution and reduce customer complaint rates.
What you'll need
At least 2+ years of P2P operations experience; ideally with experience in cryptocurrency or fintech sectors.
Strong analytical thinking skills, with the ability to interpret data and make data-driven decisions.
Excellent communication and problem-solving abilities.
Exceptional verbal and written communication skills (proficient in both Mandarin and English).
Why Bitget?
Bitget is the world's leading web 3 platform for copy trading and one of the world's largest and most respected exchanges
We are a global company with staff members from over 50 different countries and regions
We are growing and looking for world-class ambitious talents to help us continue this journey
We have a streamlined structure that empowers employees to work efficiently, delivering the best results in a short timeframe
We offer competitive salaries and benefits
Blockchain technology and digital assets have the potential to change finance in a way no other technology can - be part of it!
Payment in Crypto
Mira Küçük
Senior Blockchain Dev
Edinburgh, UK
Edinburgh, UK
Full time
Remote
About the Role
We are looking for a Senior Blockchain Developer to join our team and lead the design, development, and deployment of cutting-edge decentralized applications and smart contracts. You will play a pivotal role in shaping our Web3 architecture, ensuring scalability, security, and performance across our ecosystem.
Responsibilities
Design, develop, and deploy smart contracts and blockchain-based applications.
Architect scalable, secure, and reliable blockchain infrastructure.
Lead code reviews, mentor junior developers, and set technical best practices.
Collaborate with product, design, and business teams to translate requirements into technical solutions.
Stay ahead of emerging blockchain trends (L2s, interoperability, zero-knowledge proofs, token standards).
Integrate blockchain solutions with existing APIs, databases, and backend services.
Ensure security audits, gas optimization, and compliance with industry standards.
We are looking for a Senior Blockchain Developer to join our team and lead the design, development, and deployment of cutting-edge decentralized applications and smart contracts. You will play a pivotal role in shaping our Web3 architecture, ensuring scalability, security, and performance across our ecosystem.
Responsibilities
Design, develop, and deploy smart contracts and blockchain-based applications.
Architect scalable, secure, and reliable blockchain infrastructure.
Lead code reviews, mentor junior developers, and set technical best practices.
Collaborate with product, design, and business teams to translate requirements into technical solutions.
Stay ahead of emerging blockchain trends (L2s, interoperability, zero-knowledge proofs, token standards).
Integrate blockchain solutions with existing APIs, databases, and backend services.
Ensure security audits, gas optimization, and compliance with industry standards.
Payment in Crypto
lynn feldman
Senior Frontend Developer
Full time
Remote
At Tenderly, we're not just shaping the future of blockchain technology – we're defining it. As a full-stack Web3 infrastructure platform, we provide multi-network support and a comprehensive ecosystem that covers every aspect of the blockchain journey, from initial encounters to advanced Node solutions and serverless cloud compute functions.Our mission is crystal clear: to empower developers worldwide to harness the full potential of blockchain technology for creating innovative products. With our robust Web3 infrastructure platform, we've already enabled tens of thousands of developers to work more efficiently with blockchain. We thrive on tackling complex challenges head-on, crafting solutions that push the boundaries of what's possible in the blockchain world. From developing bespoke Ethereum Virtual Machine (EVM) implementations to designing proprietary storage layers optimized for our advanced blockchain node solutions, our team is at the forefront of industry innovation. About the RoleAre you ready to revolutionize the user experience in blockchain technology? As a Frontend Engineer at Tenderly, you will play a key role in shaping our platform’s user experience while ensuring the highest standards of quality and performance. Your role will be pivotal in driving excellence in our frontend development. What you’ll do✦ Develop and Maintain: Create and sustain frontend components and features using JavaScript, TypeScript, and React.✦ Collaborate: Work closely with across engineering and product teams to align technical solutions with company objectives, ensuring seamless integration of design and functionality.✦ Architect: Contribute to architectural decisions that drive scalability, performance, and alignment with business priorities, keeping us at the forefront of Web3 innovation.✦ Contribute: Provide technical expertise and support testing and validation efforts to ensure the success of our platform. Our Technology StackAt Tenderly, we leverage a sophisticated technology stack to deliver cutting-edge solutions. As a Frontend Engineer, you’ll work extensively with:- JavaScript- TypeScript- React- Golang (for full-stack collaboration)- Google Cloud Platform- Amazon Web Services- Supporting technologies including PostgreSQL, Kafka, Cassandra, and more About YouWe’re looking for a highly skilled and innovative frontend developer with a passion for creating exceptional user experiences. You should have:✦ Proven Experience: Demonstrated experience in technical roles, showcasing your ability to deliver high-quality software products.✦ Technical Expertise: Mastery of JavaScript, TypeScript, and React, with a deep understanding of modern frontend development practices and tools.✦ Architectural Vision: Strong decision-making skills to drive scalability, extensibility, and performance in our platform.✦ Effective Communication: Excellent communication and teamwork abilities, ensuring effective collaboration and transparent communication channels.What we offerWhy Tenderly?Join us at Tenderly, where our values are not just words on a page but the driving force behind our innovative journey.Fanatic DriveWe're passionately driven to solve our users' problems, tackling challenges with intensity and speed. Our work is our obsession, and we thrive on the fast-paced world of Web3.Underdog MentalityWe love defying the odds, rejecting the status quo, and achieving the impossible. We're on a mission to revolutionize blockchain technology, constantly pushing boundaries.Inward ResponsibilityWe hold ourselves accountable, always striving to improve. We embrace feedback, knowing it drives personal growth and collective success.Intentional CollaborationOur success relies on individual contributions and mutual support. We share ideas openly, trust each other completely, and continuously push each other to excel.Tenderly Transparency™️We believe in open, honest communication. We share knowledge and opinions freely, fostering a culture of accountability and trust.Tenderly is committed to creating a diverse environment and is proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. To find out more: https://tenderly.co/careers
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.