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:

Lead Blockchain Payments Engineer - Fiat Ramps & Financial Infrastructure

Location: London

On-site | Full-time

Compensation: Competitive

Our client is an elite team of builders operating at the intersection of fintech and high-scale crypto infrastructure. As a high-growth software organization, the company is responsible for developing the technology behind some of the largest crypto social networks and digital asset launchpads globally. The organization is defined by a philosophy of extreme talent density, rapid iteration, and technical ownership.

The Lead Blockchain Payments Engineer (Fiat Ramps) will serve as a core architect of the firm's financial infrastructure. This role is responsible for designing and scaling the services that power seamless fiat-to-crypto flows, real-time risk decisioning, and immutable financial records. Based in London, this is a full-time, in-person position for an engineer who thrives in high-throughput, low-latency environments and is passionate about building the future of global value transfer.

Key Responsibilities

Payment Orchestration & Integrations

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.

Are you excited about diving deep into a specific industry, mastering its challenges, and building a marketing playbook from the ground up?

Keycafe is looking for a Marketing Coordinator who can take ownership of a single vertical — such as vehicle fleets or first responders — and drive end-to-end demand generation. You will research the market, craft strategy, execute campaigns across multiple channels, and ultimately map out the most effective marketing motions for your industry.

You will collaborate closely with Sales, Customer Success, and Product to bring high-quality content and campaigns to life while helping shape the future of our North American marketing efforts. This role requires fluent business English and strong writing abilities.

If you’re a creative, analytical, and detail-oriented marketer who loves testing ideas and producing high-impact assets, we want to hear from you.

Do you want the challenge — and the reward — of building your own book of business?

At Keycafe, we’re looking for an Account Executive who thrives on creating new opportunities, closing deals, and owning an entire territory or industry segment. This isn’t account management or order processing — it’s a chance to be entrepreneurial inside a growing SaaS/IoT company and essentially build a business of your own.

What You’ll Do

• Own a market — you will be focused on the UAE / Middle East market, and you’ll be responsible for growing our top segments as if it were your own business.
• Run high-impact demos that clearly show prospects how our SmartBox product solves their operational challenges.
• Drive the full sales cycle: prospecting, outreach, demos, negotiation, and close.
• Experiment and adapt — try new outreach methods, refine your pitch, and find creative ways to break through.
• Collaborate across teams to ensure smooth handoffs and long-term customer success.

Why Join Keycafe

Are you a creative marketer who loves experimenting across channels to find what truly drives growth?

Keycafe is looking for a Marketing Coordinator to own our German-language marketing efforts and accelerate our brand presence across Germany. In this role, you’ll execute multi-channel campaigns, craft persuasive content in professional business German, and uncover new opportunities that expand our reach within key industries.

If you enjoy working across the full funnel, thrive in a fast-moving SaaS/IoT environment, and want to play a meaningful role in driving measurable results, this is your chance to make a global impact.

Are you a creative marketer who loves experimenting across channels to find what truly drives growth?

Keycafe is looking for a Marketing Coordinator to own our French-language marketing efforts and accelerate our brand presence across France. In this role, you’ll execute multi-channel campaigns, craft persuasive content in professional business French, and uncover new opportunities that expand our reach within key industries.

If you enjoy working across the full funnel, thrive in a fast-moving SaaS/IoT environment, and want to play a meaningful role in driving measurable results, this is your chance to make a global impact.