Principal Security Engineer - Blockchain 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: $220K - $300K

Join a stellar team of leaders and experts in blockchain technology, cryptography, and infrastructure to build the backbone of blockchain wallet infrastructure for the next financial era. We are hiring a Principal Security Engineer to lead security design and development across our entire platform. Reporting directly to the CISO, you will set the strategy to protect our high-stakes financial systems, fix vulnerabilities, and keep client wallets safe.

This is a strategic and highly technical role spanning the full security lifecycle. You will make security part of every layer of the stack, from architecture design to incident response. Beyond defense, you will champion secure development practices, mentor engineers, and represent the company's security posture to clients and the wider community.

Responsibilities:

Lead Protocol Engineer - HyperEVM DeFi Trading Infrastructure

Location: Remote - Preference for EST time zone or candidates that can overlap with EST

Compensation: $200K - $300K

We are building the next generation of DeFi trading, leveraging decentralized technologies to democratize access to global financial markets. As the largest builder product on our core platform, we have processed north of $50 billion in cumulative trading volume and achieved eight figures in revenue in the past year. We are a small, highly technical team focused on results, and are seeking a Lead Protocol Engineer to architect and scale our smart contract infrastructure on HyperEVM.

You will be the technical owner and lead protocol developer, responsible for the design, implementation, and deployment of smart contracts on the HyperEVM. This role is ideal for a strong individual contributor who thrives in a low-process, high-trust, and ambiguous 0-to-1 environment. You will be building DeFi primitives and trading infrastructure designed to scale to millions of traders and billions in daily volume.

What You Will Do:

Engineering Manager - Intent-Based Cross-Chain Infrastructure

Location: Remote

Compensation: $180K - $200K

We are building programmable, intent-based infrastructure on a leading Layer 1 protocol, making blockchain interactions smoother, smarter, and more composable. Our work enables intent-driven execution across chains, requiring high-velocity technical delivery and strong team leadership. We are seeking an Engineering Manager to accelerate execution across projects, partner integrations, and cross-team initiatives.

This role is focused on making things happen: ensuring technical projects are delivered on time, partner integrations run smoothly, and internal teams are fully aligned. You will lead and mentor a multidisciplinary engineering team while owning technical guidance, reliability management, and strategic process implementation.

Key Responsibilities:

Role Purpose:

The Cloud DevSecOps Engineer is responsible for designing, implementing, and securing cloud-based infrastructure and CI/CD pipelines. The role ensures seamless automation, robust security integration, and efficient monitoring of systems across OCI and GCP environments to enable secure, scalable, and high-performing applications.

Key Responsibilities:

1. CI/CD Pipeline & DevSecOps

• Design, build, and secure CI/CD pipelines using GitHub Actions.

• Integrate automated security testing (SAST/DAST) using SonarQube and related tools.
• Implement and manage GitOps workflows for continuous delivery using ArgoCD.

2. Cloud Infrastructure & Automation

About the Role
We are seeking an experienced Staff Software Engineer to lead the design and delivery of secure, scalable backend systems. This is a hands-on leadership role with responsibilities spanning architecture, coding, and mentoring, while partnering closely with Product and cross-functional teams.

Key Responsibilities

• Design and build reliable, testable, production-ready backend services.
• Drive architectural decisions and own features end-to-end.
• Write clean, maintainable code with strong test coverage.
• Mentor engineers and set best practices across the team.
• Oversee system monitoring, incident response, and workflow improvements.
• Collaborate cross-functionally and contribute to hiring efforts.

Requirements

• 5+ years backend experience, 4+ years with Node.js & TypeScript.
• Strong expertise in AWS (Lambda, Cognito, S3, DynamoDB, SQS/SNS, CloudFormation).
• Experience with serverless, microservices, event-driven architectures.
• Skilled in TDD, CI/CD, REST/GraphQL APIs, secure coding.
• Proficiency in SQL and NoSQL databases.
• Startup/fast-paced environment experience preferred.

Antipollution, a member of Vasileiadis Group of Companies (V Group), is a leading provider of environmental and waste management solutions across the Eastern Mediterranean, Egypt, and the Balkans. Operating in six main business pillars, including Port Reception Facilities, Emergency Response Services, Decontamination Services, Renewable Energy, Alternative Fuel Production from Waste, and Technology, we are committed to sustainability, innovation, and operational excellence.  

Role Overview: 
We are seeking an experienced Project Manager to lead the dismantling of industrial facilities within a high-demand, safety-critical environment. The selected candidate will be responsible for the end-to-end planning, execution, and delivery of the project, ensuring that all activities are performed in accordance with the project scope, timeline, budget, and safety standards. 

The Project Manager will be located in Thessaloniki and will coordinate multidisciplinary teams, manage subcontractors, and serve as the key liaison between the client, the engineering teams, and company leadership. This role requires a strong technical background, excellent organizational skills, and hands-on experience in dismantling, decommissioning, or heavy industrial projects. 

Key Responsibilities: 

1. Project Planning and Management: 

We are looking for a hands-on Security Operations Engineer to own and evolve our security posture across infrastructure, endpoints, and internal systems. You will be the primary driver of day-to-day security operations — from managing protective tooling to responding to incidents and coordinating audits. This is a high-ownership role with direct impact on how the company detects, responds to, and prevents security threats.

About AHOY:

AHOY is a pioneering tech company dedicated to developing innovative solutions that address the complexities of modern business logistics. We specialize in creating systems that streamline processes, enhance efficiency, and ultimately simplify cross-border shipping for our clients. Our vibrant culture promotes collaboration and creativity, allowing our team to drive impactful changes in the logistics industry.

Position Overview:

We are seeking a Senior Product Manager / Product Lead for our Cross-Border Shipping initiative at AHOY. In this role, you will take charge of our product strategy, from ideation to execution, ensuring that our offerings meet the dynamic needs of the market. The ideal candidate will have a deep understanding of shipping and logistics, exceptional leadership skills, and a track record of successful product management.

Requirements

Key Responsibilities:

We are seeking a highly experienced IT Professional to support and enhance our mission-critical systems with a focus on financial (systems) and cybersecurity infrastructure. This role is pivotal in maintaining system integrity, ensuring compliance with financial regulations, and defending against evolving cyber threats. 

Systems engineering 

• Provide tier 3 support for complex infrastructure and application issues. 

• Design, implement, and maintain high-availability systems for financial platforms. 

• Perform system performance tuning, capacity planning, and disaster recovery testing. 

• Automate operational tasks using PowerShell, Python, or other scripting tools. 

Financial systems support 

• Manage and support financial applications such as ERP systems and reporting tools. 

• Ensure systems meet security standards. 

• Collaborate with finance and audit teams to support secure data flows and reporting. 

Cybersecurity operations 

Antipollution, a member of Vasileiadis Group of Companies (V Group), is a leading provider of environmental and waste management solutions across the Eastern Mediterranean, Egypt, and the Balkans. Operating in six main business pillars, including Port Reception Facilities, Emergency Response Services, Decontamination Services, Renewable Energy, Alternative Fuel Production from Waste, and Technology, we are committed to sustainability, innovation, and operational excellence.

Role Overview:

We are seeking an experienced Project Manager to lead the dismantling of industrial facilities within a high-demand, safety-critical environment. The selected candidate will be responsible for the end-to-end planning, execution, and delivery of the project, ensuring that all activities are performed in accordance with the project scope, timeline, budget, and safety standards.

The Project Manager will be located in Athens and will coordinate multidisciplinary teams, manage subcontractors, and serve as the key liaison between the client, the engineering teams, and company leadership. This role requires a strong technical background, excellent organizational skills, and hands-on experience in dismantling, decommissioning, or heavy industrial projects

Key Responsibilities:

1.    Project Planning and Management: