Senior Core Systems Engineer - Secure Wallet Infrastructure

Location: Remote - Location: US or EU (remote-first, office optional). Must be in the US, not Canada or in the European Union. France or Paris or as close as possible, always preferred.

Compensation: $180K - $260K

Join a stellar team of leaders and experts in blockchain technology, cryptography, infrastructure, and security to build the backbone of blockchain wallet infrastructure for the next financial era. We are hiring a Senior Core Systems Engineer to design, build, and scale the low-level systems at the heart of our platform, where performance, security, and correctness are non-negotiable. This is a high-impact role focused on turning advanced cryptography into fast, resilient, and trusted production infrastructure.

As a Core Systems Engineer, you will work deep in the stack, designing and scaling reliable distributed services and integrating them with cloud, hardware, and blockchain environments. You will collaborate across product, research, and security to implement advanced cryptographic and security protocols using low-level systems languages.

Responsibilities:

Developer Advocate - Climate & Sustainability

Location: Remote - US only

Compensation: Competitive

We are a fast-growing software company committed to supporting a high-performance, open-source, proof-of-stake platform. Our platform is EVM-compatible and built specifically to meet the needs of enterprise and Web3 applications, demanding speed, security, and sustainability. We are seeking a Developer Advocate to focus on Climate and Sustainability initiatives in the Americas, acting as the technical bridge to drive the adoption of decentralized solutions for ESG (Environmental, Social, Governance) goals.

You will be at the forefront of the platform's latest developments, focusing on how climate-oriented decentralized applications (dApps) can be effectively built using the platform's native services and specialized solutions (e.g., the Guardian platform). Your work will architect and drive the adoption of decentralized tools for sustainability, enabling organizations to meet their ESG objectives.

Responsibilities:

Who we are?

SupportYourApp is a global Support-as-a-Service leader, partnering with tech companies and industry leaders like MasterCard, Calm and MacPaw in 30+ countries since 2010 to deliver secure customer and technical support. We operate globally, supporting clients in 60 languages across diverse industries. So what if you had a chance to be a part of the world’s leading SaaS, software, or hardware solutions?

Join our community as a L2 Technical Support Consultant today and thrive in a multicultural and multilingual environment while enjoying your home office. Unlock your potential by mastering new skills and achieving challenging goals in cooperation with our People First management approach. Excited? Let’s see what it takes.

What you will do:

Who we are?

SupportYourApp is a global Support-as-a-Service leader, partnering with tech companies and industry leaders like MasterCard, Calm and MacPaw in 30+ countries since 2010 to deliver secure customer and technical support. We operate globally, supporting clients in 60 languages across diverse industries. So what if you had a chance to be a part of the world’s leading SaaS, software, or hardware solutions?

Join our community as a L2 Technical Support Consultant today and thrive in a multicultural and multilingual environment while enjoying your home office. Unlock your potential by mastering new skills and achieving challenging goals in cooperation with our People First management approach. Excited? Let’s see what it takes.

What you will do:

Location: San Francisco, CA (100% On-site)

Compensation: $150,000 - $210,000 (Based on experience and qualifications) + Competitive Equity

We are a growing technology company dedicated to accelerating life science research with the ultimate goal of eradicating disease. We are building a Scientific Physical AI platform that leverages AI, robotics, and biology to help scientists scale their lab work and generate orders of magnitude more data than previously possible. Join our mission-driven team of engineers to build the future of scientific research.

As a Robotics Software Engineer, you will be a key player in developing and deploying intelligent robotic systems that automate and scale complex laboratory procedures. This is a highly hands-on role where your code will directly control physical robots.

Key Responsibilities:

GoMining is a global Bitcoin ecosystem on a mission to unlock the full potential of Bitcoin. We create tools and services that make it simple and secure to earn, use, and benefit from Bitcoin daily regardless of country, income, or level of knowledge.

You will ensure product quality through automated and manual testing, maintaining a high standard across web, mobile, and backend services.

Responsibilities

• Design and execute test cases, ensuring full coverage across UI, API, and mobile platforms.

• Develop and maintain automated tests using Playwright + TypeScript (UI, API, e2e).
• Work with Git (CLI, GitLab) for version control and CI/CD integration.
• Manage test documentation and results via Allure TestOps / Allurectl.
• Conduct testing of iOS and Android apps (TestFlight, Google Internal Testing).
• Capture and analyze mobile traffic for debugging and performance validation.
• Use diagnostic and monitoring tools (RMQ, Grafana, Sentry, Rancher) to ensure system stability.
• Collaborate with developers, analysts, and product managers to improve quality processes.

Requirements

We are looking for a motivated and proactive JavaScript Developer to join our Support & Hands History team. You’ll be working on existing game titles built with PixiJS — supporting, maintaining, and enhancing them, while also collaborating closely on the development and evolution of our internal game library.

Requirements

• At least 1.5 years of commercial experience in JavaScript / Frontend development;
• Hands-on experience with PixiJS — commercial or non-commercial (e.g. pet projects, game jams, educational demos);
• Proven experience working with animations, including: Pixi-Spine, Animated Sprite, animation libraries (e.g. GSAP);
• Experience with version control systems (Git) and understanding of CI/CD processes;
• Experience working with texture generation tools or texture atlases;
• Understanding of game performance optimization and browser debugging;
• Languages: Ukrainian — required; English — B1 level or higher.

Robusta Technology Group (RTG) is a key driver of digital transformation by providing a holistic tech ecosystem. RTG works with its local and international partners to help build digital customer experiences, establish engineering hubs and build ventures across multiple industries and domains. In this pursuit, RTG serves as a catalyst for impact and growth through events, spaces and content focused on creating impact and growth across the different interactions.

Octopus is proud to be part of the Robusta Technology Group (RTG), a leading tech consultancy group. With a decade of experience and a successful track record of delivering over 300 projects across Europe, the Middle East, and North America, RTG has established itself as a preferred employer in the Egyptian market. Octopus and Robusta are building a bridge between Europe and Africa, creating tailored hub solutions to connect companies with top talent across the globe.

Job Overview

About the Company 

We are a UAE-based technology company focused on building scalable digital platforms and logistic solutions for modern enterprises. Our team operates in both physical and remote environments, bringing together experienced engineers who value innovation and collaboration. We strive to deliver products that are efficient, secure, and designed for long-term growth. 

About the Role 

We are looking for a Mobile Engineer who will build and maintain mobile applications using React Native. The role focuses on developing tools that help drivers, warehouse staff, and customers stay connected through real-time updates on deliveries, routes, and inventory. You will work with backend developers, product managers, and operations teams to turn logistics processes into simple and reliable mobile experiences. The goal is to improve tracking, communication, and efficiency across our logistics network. 

Requirements

Key Responsibilities 

About the Company 

We are a UAE-based technology company focused on building scalable digital platforms and logistic solutions for modern enterprises. Our team operates in both physical and remote environments, bringing together experienced engineers who value innovation and collaboration. We strive to deliver products that are efficient, secure, and designed for long-term growth. 

About the Role 

We are looking for a Front-End Developer with strong React skills to build responsive and efficient web applications. You will turn modern UI and UX designs into clean, functional components, connect them with APIs, and ensure smooth performance across all devices. The ideal candidate is detail oriented, writes clear code, and works well in a collaborative environment. 

Requirements

Key Responsibilities