Location: Remote - US or EU

Remote | Full-time

Compensation: $160K - $240K

Our client operates a core banking platform designed specifically for digital assets, enabling fintechs and systemically important financial institutions to build, operate, and scale onchain infrastructure. The platform secures over €100B in assets and powers critical operations—including key management, transaction processing, treasury, and compliance—for over 400 global institutions.

Our client is seeking a Principal Security Engineer to lead product security across the entire ecosystem. In this role, security is built directly into the system's architecture rather than applied as a secondary control. The ideal candidate will take ownership of hardening key management, signing workflows, authentication systems, policy enforcement, and multi-chain integrations.

Beyond core product security and vulnerability management, this position plays a pivotal role in shaping the long-term architectural vision of a platform trusted by tier-one financial institutions. As an organization committed to technical excellence, our client also encourages contribution to the broader security community through research, publications, and industry events.

Key Responsibilities

Sales & Integrations Engineer

Description

Are you passionate about automation, APIs, and building seamless software integrations? Keycafe is looking for a Sales & Integrations Engineer to develop, manage, and scale integrations between our platform and third-party applications. This role is ideal for someone who thrives in a fast-paced, customer-focused environment and enjoys leveraging automation tools to create impactful solutions.

In this role, you'll:

• Design, develop, and maintain integrations using automation platforms like n8n, Pipedream, or similar tools.
• Collaborate with industry teams to understand customer needs and build tailored automation solutions.
• Optimize and scale integrations for performance, efficiency, and reliability.
• Troubleshoot and resolve integration issues to ensure seamless system functionality.
• Stay ahead of new automation technologies and quickly adapt if we transition from n8n to another tool.
• Work closely with stakeholders to identify new integration opportunities and best practices.
• Be a primary French speaking source of contact for our Integrations customers throughout Europe

Why Join Keycafe?

Innovative, fast-growing tech company with a global presence.

Fully remote role with flexible work arrangements.

Opportunity for career growth in a high-impact role.

Sales & Integrations Engineer

Description

Are you passionate about automation, APIs, and building seamless software integrations? Keycafe is looking for a Sales & Integrations Engineer to develop, manage, and scale integrations between our platform and third-party applications. This role is ideal for someone who thrives in a fast-paced, customer-focused environment and enjoys leveraging automation tools to create impactful solutions.

In this role, you'll:

• Design, develop, and maintain integrations using automation platforms like n8n, Pipedream, or similar tools.
• Collaborate with industry teams to understand customer needs and build tailored automation solutions.
• Optimize and scale integrations for performance, efficiency, and reliability.
• Troubleshoot and resolve integration issues to ensure seamless system functionality.
• Stay ahead of new automation technologies and quickly adapt if we transition from n8n to another tool.
• Work closely with stakeholders to identify new integration opportunities and best practices.

Why Join Keycafe?

Innovative, fast-growing tech company with a global presence.

Fully remote role with flexible work arrangements.

Opportunity for career growth in a high-impact role.

Work alongside a talented international team on cutting-edge integrations.

About Us:

Robusta assists organizations in transitioning to a digital-first approach, crafting unforgettable experiences for their customers. We provide strategy, design, product, and technology services to prominent businesses and brands, utilizing our go-to-market expertise to facilitate seamless customer experiences and enhance conversion rates.

About the Role

We are seeking a highly experienced Senior Data Engineer to lead the technical design, implementation, and delivery of an enterprise-grade, AI-ready Data Lakehouse platform. This role is critical in building the foundational data layer for a large-scale digital transformation initiative that will support AI agents, digital workers, and knowledge graph (ontology) systems.

The ideal candidate will have strong software engineering experience with a focus on data pipeline development, data architecture, and scalable distributed systems. You will play a key role in designing and maintaining robust data infrastructure that enables advanced analytics and AI capabilities.

This position also involves technical leadership, mentoring engineering teams in a collaborative co-building model, and ensuring long-term operational ownership.

Are you a driven communicator who loves creating conversations, uncovering opportunities, and opening doors for a global SaaS/IoT product?

Keycafe is seeking an Outbound Sales Development Representative to engage potential customers across the United States and Canada, introducing them to the capabilities of the Keycafe SmartBox. You’ll be at the front line of the sales organization — generating pipeline, qualifying prospects, and setting up Account Executives for success.

If you’re motivated, confident on the phone, highly organized, and ready to grow your career in a fast-moving international sales team, this role is for you.

What You’ll Do

• Proactively reach out to targeted prospects via outbound calls, emails, and multi-channel outreach.
• Qualify leads, understand pain points, and schedule high-quality meetings for Account Executives.
• Manage and nurture early-stage opportunities from first contact through handoff.
• Clearly articulate Keycafe’s SmartBox value proposition and how it solves operational challenges.
• Consistently meet and exceed weekly/monthly outreach and booking quotas.
• Collaborate with sales and marketing to refine messaging, targeting, and outreach strategy.
• Maintain accurate activity tracking and lead notes in CRM systems.

Location: New York, United States • London, United Kingdom (Office)

On-Site | Full-time

Compensation: Competitive Compensation

Our client is a high-growth software development company and a major contributor to one of the largest and fastest-growing crypto social networks globally. Operating in a high-velocity, high-impact environment, the organization builds cutting-edge infrastructure that supports massive global transaction volumes and substantial revenue generation.

The organization is seeking a Staff Software Engineer (Payments) to design and build the core payment services at the center of this ecosystem. This is a senior, high-ownership role designed for an engineer who thrives on solving hard, ambiguous problems end-to-end—from the moment money enters the system to final settlement, reconciliation, and delivery.

Operating within a lean team of highly experienced engineers, the successful candidate will focus on 0→1 development, moving quickly while maintaining the absolute rigor required for financial systems. The engineering culture prioritizes low bureaucracy, continuous production deployment, and trust in individual judgment over rigid processes.

Key Responsibilities

Senior Web3 Software Engineer

Location: Europe/US/Latam

Remote | Full-time

Compensation: $170K - $195K

Our client is a pioneer in the blockchain sector, developing a high-performance operating system designed to redefine scalability and throughput for Ethereum. By combining parallel transaction execution with advanced state minimization, our client’s platform overcomes traditional protocol limitations to provide a groundbreaking environment for decentralized development.

Since its initial launch in 2019, the organization has remained dedicated to enhancing Ethereum's ecosystem through technical innovation, including the creation of a bespoke virtual machine and a specialized programming language. The team is a globally dispersed group of innovators committed to shaping the future of blockchain technology through secure, decentralized, and high-throughput solutions.

Our client is seeking a Senior Web3 Software Engineer to lead the development of high-performance decentralized applications (dapps). This individual will own major product surfaces end-to-end—from frontend interfaces to on-chain integrations—collaborating across product, design, and smart contract teams to deliver secure and intuitive experiences for traders and users.

Key Responsibilities

Mobile App Engineer

Location: New York (Office)

On-site | Full-time

Compensation: $185K - $300K

Our client is developing a next-generation mobile trading platform designed to redefine the future of finance. Unlike simplified retail applications, this platform offers a full-featured trading experience, including live market data, complex order types, and multi-venue execution.

The Mobile Engineer will be responsible for bringing the power of professional trading terminals to a mobile form factor. The role involves tackling sophisticated engineering challenges, such as maintaining synchronized real-time price feeds and ensuring system performance remains stable during periods of high market volatility. This position is ideal for a developer who excels in high-bandwidth, in-person collaborative environments and is passionate about building ambitious systems from the ground up.

Key Responsibilities

Staff Mobile Engineer (React Native)

Location: Fully remote in Europe or India

Compensation: $60K - $70K

We are a fast-scaling financial technology startup operating at the intersection of Prediction Markets, AI, and Blockchain.

Our platform is currently processing $200M in annualized volume and experiencing explosive growth of 100% week-over-week. We are backed by elite institutional investors, including a $500M AUM digital asset fund and a premier AI/Crypto accelerator with a sub-1% acceptance rate. We are looking for a world-class Staff Mobile Engineer to own our iOS experience and build a high-stakes trading environment where performance is the primary product feature.

As a Staff Mobile Engineer, you will be the architectural lead and primary owner of our iOS trading experience. This is a product-critical role where your code sits directly between our users and live, real-money markets. You will work in a high-bandwidth environment alongside the CEO, COO, and founding engineering team to ship a mobile experience that rivals the best in TradFi.

Key Responsibilities:

Senior Frontend Engineer (Web3/DeFi)

Location: Fully Remote - EU time zones Type: Full-Time

Compensation: $150K - $175K

We are seeking a high-caliber Senior Frontend Engineer to lead the development of a performant, responsive, and real-time application powering a next-generation decentralized exchange (DEX) and network. In this role, you will bridge the gap between complex blockchain infrastructure and a seamless user experience, meeting the demands of a fast-paced, data-intensive trading environment.

Our team is a dynamic, forward-thinking, and fully remote group with an ambitious roadmap. We are looking for an engineer who thrives on the intersection of DeFi, Web3, and high-stakes security. If you have a relentless drive for speed without sacrificing rigor, and a commitment to state-of-the-art software testing, we want to build the future of finance with you.

Key Responsibilities: