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Serotonin Inc
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  • Full Stack Engineer - Go (Mojito Product Team)  

    - Waltham Cross
    Full Stack Engineer - Go (Mojito Product Team)Mojito is building the l... Read More

    Full Stack Engineer - Go (Mojito Product Team)

    Mojito is building the leading platform for crypto-native commerce and community. We empower brands and creators to launch digital experiences, marketplaces, and tokenized products with a seamless Web3 toolkit. Our team combines deep expertise in crypto, software, and consumer experiences, backed by top-tier investors and partners.
    Were looking for a Founding Full-Stack Engineer to join our core product team. This is a unique opportunity to own the architecture and implementation of a platform at the intersection of Web3 and consumer experiences. Youll work across the stack from frontend to backend to infrastructure while helping define the technical culture and trajectory of the company.What Youll DoLead the design and development of new product features across a Next.js frontend and Go-based backendOperate and evolve our GCP/Kubernetes infrastructure for scalability and reliabilityBuild high-performance APIs and distributed microservices in Go + PostgreSQL, with a focus on SQL optimization and cachingArchitect and deploy smart contracts (Solidity / Move) on Ethereum and Sui, with security and robustness as top prioritiesEstablish engineering best practices for code quality, observability, testing, and performance from the ground upPartner closely with the founding team on product strategy, architecture, and roadmapWhat Were Looking ForHands-on production experience with Go, Next.js, SQL optimization, and KubernetesDeep familiarity with PostgreSQL, Docker, GCP, NATS, and caching strategiesStrong skills in building scalable UIs, APIs, and distributed microservicesCrypto-native mindset with smart contract development experience (Solidity on Ethereum, Move on Sui)Bonus: Strengths in performance tuning, observability, and toolingThe Ideal MindsetYou thrive in an early-stage startup environment and embrace founder-like ownershipYoure motivated to build and scale products that push the boundaries of Web3You care deeply about quality, security, and user experienceYoure excited to help shape the technical and cultural foundation of Mojito




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  • Web3 Social Media Manager Open Application  

    - Ayr
    Web3 Social Media Manager Open ApplicationWho is SerotoninSerotonin is... Read More

    Web3 Social Media Manager Open Application

    Who is SerotoninSerotonin is the leading breakthrough marketing and communications partner for digital asset companies, working with the top businesses and entrepreneurs in the industry on brand positioning, media relations, content, growth marketing, and go-to-market strategy. We bring together a deep expertise in financial services, digital assets, and decentralizing technologies to help innovators tackle some of the biggest challenges facing business and society by building the next generation of products, services, and experiences.
    About the RoleSerotonin is seeking a social media manager to lead, develop and execute effective organic social media management and engagement strategies on behalf of clients. The person in this role will work closely with a full team of marketers which includes PR, Content and Branding pillars. The ideal candidate should have a deep understanding of crypto and blockchain with strong familiarity of Crypto Twitter, Facebook, instagram, and any other social platforms relevant to the industry as it evolves. This role with roll up to the Social Media Director and is responsible for overseeing assigned clients daily social media output. ResponsibilitiesManage the social media strategy, operations, and execution for 3-5 Serotonin clients.Ability to write in multiple voices; from informative to humorous and lighthearted - able to tailor messaging to platform in line with clients branding.Leverage data and social media marketing tools to analyze areas of weakness in order to grow internal serotonin and client brands.Maintain both a consistent understanding and a strong pulse of the current events within the web3 ecosystem. Work closely with the Social Media Director and SVP of Content, Community, and Social as well as the client Marketing Directors to develop social strategy and proactively ideate new social opportunities for clients.Create and maintain account management systems to operationalise scheduling, posting, and replying.Work closely with the content and community team to plan and execute owned marketing campaigns.Collaborate cross functionally with PR, events, community, marketing, growth ensuring content remains consistent and aligned.Leverage data and social media marketing tools to analyze areas of weakness in order to grow internal serotonin and client brands.Strategize, operate, and execute other social media activities such as: Twitter Spaces, AMAs, giveaways, and growth campaigns.Remain well-versed in the social strategies of other technology and product teams.RequirementsCrypto obsessed (or at the very least, extremely curious and willing to learn more) Deep industry knowledge (you know, or better yet, regularly use web3 apps and have a strong perspective on what works and what doesnt in web3 marketing especially pertaining to social-first viral campaigns)Experience creating high-volume content for social media platforms like X (primarily), and LI/IG/YouTube/TikTok/Warpcast (secondary) Experience with end-to-end management of social platforms from posting to analytics social listening (bonus points if you understand Kaito and yap for breakfast)A team player who loves collaborating as much as they do owning something individually from start to finish and knows when and how to get the most out of others. Both independent hustle and dream team vibes. The ability to balance, evergreen content, product-marketing, and creative campaigns and do so with Messi-esque agility An interest (or experience) in founder-led social media Technical expertise (or a very sponge-like brain). If you have a specific lane of technical expertise, thats cool, but we expect you have a thirst for knowledge across different use cases An open mind and ability to take feedback and run with it! And most importantly..An unquenchable thirst for crafting compelling, insanely creative content that simplifies products, converts & engages audiences, fuels growth and mindshare, taps into trends (or creates new ones) and stops scrollers in their tracks and makes them go damn. Whether you were born in the trenches on Crypto Twitter, degened your way out of one too many rugpulls, or caught the web3 bug while creating content at an award-winning advertising agency, tech startup, or while building your own personal brand were looking for creative swiss-army knives who treat every touchpoint as an opportunity to dazzle clients and users. Were also especially excited to talk to candidates who have experience (and/or a rapidly growing interest) in creating multimedia content with the help of cutting edge AI tools, as well as familiarity with the Adobe Photoshops of the world, to bring short, snackable videos, memes, graphics, podcast clips, and on, to life. If you can as effortlessly craft a banger (i.e., technically accurate and compelling) Twitter thread on ZK proofs as you can create an AI video of Vitalik riding a Unicorn, we want to talk. BenefitsCompetitive SalaryHealth Insurance - (US Only) 401(k) - (US Only) Remote Work EnvironmentDisclaimer:This is an open application opportunity. Submission of your materials does not guarantee a response or further engagement. Due to the volume of interest and the evolving nature of our hiring needs, applicants may not receive a reply, or may be contacted several months after submission if and when a relevant opportunity arises. We appreciate your interest and understanding.
    $75,000 - $110,000 a year

    Compensation details: 75000-110000 Yearly Salary



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  • Senior Blockchain Engineer (External)  

    - Waltham Cross
    Senior Blockchain Engineer (External)Our client is the first Bitcoin s... Read More

    Senior Blockchain Engineer (External)

    Our client is the first Bitcoin security-equivalent Layer2 solution based on BitVM approach. Their core objective is to address the trade-off between security and Turing completeness in Bitcoin Layer2s through cryptographic innovations and blockchain protocol engineering. This is intended to ultimately foster a prosperous Bitcoin ecosystem.
    Operating in the blockchain and cryptocurrency space, providing secure infrastructure for the creation and management of decentralized digital assets. They specialize in developing solutions for transactions and asset management that prioritize privacy and security. By integrating advanced cryptographic protocols, the platform allows users to issue, transfer, and track digital assets, such as tokens or digital currencies, with a focus on scalability and efficiency. Additionally, they offer services that enable users to automate complex financial operations and manage assets across multiple blockchains seamlessly.Key Responsibilities:Responsible for the design and development of blockchain infrastructure (wallets/cross-chain bridges).Responsible for the design and development of smart contract solutions.Act as the project owner to ensure the successful implementation of blockchain projects.Key Requirements:Familiarity with the principles of mainstream blockchain systems (ETH/BTC/SOL).Proficient in using one or more of the following languages: Golang/Java/Rust/C/C++/Solidity.Proficient in using mainstream languages to build systems or applications in the blockchain field.Prior experience in implementing well-known blockchain projects is preferred.Experience contributing to well-known open-source projects is preferred.




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  • Protocol Engineer - Rust (External)  

    - Waltham Cross
    Protocol Engineer - Rust (External)Our client is a cutting-edge compan... Read More

    Protocol Engineer - Rust (External)

    Our client is a cutting-edge company focused on revolutionizing global payments by building a scalable, zero-fee payment platform secured by Bitcoin. Their innovative technology enables fast, secure, and cost-effective digital transactions, with the potential to reshape how the world interacts with money. We are looking for a talented Rust Protocol Engineer to join their growing team.
    This is an exciting opportunity to work on groundbreaking blockchain technologies, including high-throughput execution environments, Proof-of-Stake consensus mechanisms, and decentralized application integrations.
    If youre excited about joining a dynamic and purpose-driven environment where your ideas can shape the future, wed love to meet you. Together, we can redefine whats possible in the world of digital connectivity and data management.Key Responsibilities:Design, develop, and maintain core components of our blockchain-based payment protocol using Rust.Implement and optimize consensus algorithms, UTXO/Account hybrid models, and high-performance transaction processing systems.Collaborate with cross-functional teams, including product managers and front-end developers, to deliver seamless and secure payment solutions.Conduct performance profiling and debugging of blockchain systems to ensure scalability, security, and efficiency.Write comprehensive unit tests, documentation, and support code reviews to maintain high-quality standards.Stay up-to-date with the latest trends in blockchain technology, Rust programming, and distributed systems.Key Requirements:3+ years of experience in software development, with a strong focus on Rust.Solid understanding of blockchain protocols, cryptographic algorithms, and distributed systems.Proven experience in optimizing code for performance and scalability in production environments.Strong problem-solving skills and the ability to work independently and as part of a team.Excellent written and verbal communication skills.Preferred QualificationsExperience with Bitcoin scripting and payment channels.Familiarity with WebAssembly (Wasm) or similar execution environments.Contributions to open-source blockchain or Rust projects.Familiarity with UTXO and Account-based models, as well as Proof-of-Stake consensus mechanisms.What We Offer Competitive salary and equity options.Flexible working hours and remote-friendly environment.The chance to work on cutting-edge technology with a talented, passionate team.Opportunities for professional growth and learning.




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  • Senior Rust Developer - Protocol Researcher (External)  

    - Waltham Cross
    Senior Rust Developer - Protocol Researcher (External)Our client is th... Read More

    Senior Rust Developer - Protocol Researcher (External)

    Our client is the first Bitcoin security-equivalent Layer2 solution based on BitVM approach. Their core objective is to address the trade-off between security and Turing completeness in Bitcoin Layer2s through cryptographic innovations and blockchain protocol engineering. This is intended to ultimately foster a prosperous Bitcoin ecosystem.
    Operating in the blockchain and cryptocurrency space, providing secure infrastructure for the creation and management of decentralized digital assets. They specialize in developing solutions for transactions and asset management that prioritize privacy and security. By integrating advanced cryptographic protocols, the platform allows users to issue, transfer, and track digital assets, such as tokens or digital currencies, with a focus on scalability and efficiency. Additionally, they offer services that enable users to automate complex financial operations and manage assets across multiple blockchains seamlessly.Key Responsibilities:Research & Innovation: Research initiatives in blockchain systems, particularly in areas such as ZK-rollups, Layer 2 solutions, and bridge systemsProtocol Development: Design and implement blockchain protocols and experimental features using RustSystem Architecture: Architect and develop robust distributed systems with a focus on scalability and securityDocumentation & Publication: Document research findings and contribute to technical papers and specificationsKey Requirements:3+ years of experience in systems programming using Rust, Go, or C++Strong background in distributed systems and blockchain technologyDeep understanding of cryptographic primitives and their implementationsProficiency in blockchain fundamentals including: Consensus protocols (PoW, PoS, PBFT, Tendermint)P2P networking and distributed systemsBlockchain security and cryptographyExperience with Bitcoin, Ethereum, or other major blockchain platformsStrong algorithmic problem-solving skillsExcellent communication skills and ability to work in a research-oriented environmentPreferred Requirements:Experience with Zero-Knowledge Proof systems and ZK-VM implementationContributions to open-source blockchain projectsAcademic research experience or publications in relevant fieldsExperience with Layer 2 scaling solutions (Rollups, State Channels)Knowledge of advanced cryptographic protocols (SNARKs, STARKs)




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  • Chief Marketing Officer (Web3) - External  

    - Waltham Cross
    Chief Marketing Officer (Web3) - ExternalWere enabling global builders... Read More

    Chief Marketing Officer (Web3) - External

    Were enabling global builders, fintechs and integrators to launch and connect programmable digital dollars in an interoperable, composable networkproviding liquidity, on-chain governance and institutional-grade safeguards for a new era of finance. If youre driven by redefining money, infrastructure, and scale-driven marketing, this is the opportunity to shape not just a brand, but a foundational movement.
    As Chief Marketing Officer, you will be the architect of a global brand narrative that bridges innovation, trust, and impact. Youll lead a multidisciplinary team to craft and execute data-driven marketing strategies that elevate awareness, drive adoption, and position the organization as the category leader in digital asset infrastructure. This role demands a visionary marketersomeone equally fluent in strategy and storytelling, who can translate complex technology into human-centered messages that resonate across enterprises, developers, regulators, and institutional partners.Key Responsibilities:Marketing Strategy & Vision: Develop and execute a comprehensive marketing strategy spanning community, content, events, and partnerships to drive network growth and user adoption. Align marketing initiatives with our business objectives and bold vision for decentralization. Brand Narrative & Positioning: Craft and champion the brand narrative and positioning, creating a clear, compelling story that resonates with users, partners, and the broader Web3 community. Elevate the identity with a bold voice that stands out in the decentralized tech space. Community Building: Lead community growth and engagement across Discord, Twitter (X), Telegram, and other platforms building a vibrant community from the ground up. Nurture advocates and ambassadors who champios the mission and expand our reach. Foster an environment of trust, engagement, and excitement among early adopters. Content & Campaigns: Drive creative marketing campaigns and content initiatives that boost user engagement and retention. Oversee content creation (social media, blogs, videos, etc.) and educational resources to keep our community informed and excited all while ensuring every message reflects their bold and provocative voice. Public Relations & Communications: Manage all PR and communications efforts to position them as a thought leader in Web3. Secure strategic media coverage and speaking opportunities at industry events. Serve as the confident public face of the company at conferences, AMAs, and in the press, articulating our vision for decentralization and DePIN with clarity and conviction. Partnerships & Ecosystem Growth: Forge strategic partnerships across the Web3 and DePIN ecosystem to amplify our reach and utility. Work closely with other projects, protocols, and influencers on co-marketing initiatives that drive network effects and grow their user base. Expand their presence by collaborating within the community and industry to catalyze adoption. Team Leadership: Build and mentor a high-performing marketing team, fostering a culture of creativity and data-driven experimentation. Inspire and empower team members to execute bold ideas with excellence, and lead by example as a hands-on marketer and mentor. Metrics & Optimization: Establish clear KPIs and success metrics for all marketing efforts, and continuously analyze performance data to inform decisions. Iterate quickly on campaigns based on insights, ensuring our marketing is solution-oriented and delivering tangible growth in users and engagement.Key Requirements:Experience: 10+ years of marketing experience with a strong track record in leadership roles, including significant exposure to high-growth tech or Web3 startups. You have scaled marketing organizations and delivered results in fast-paced environments. Web3 Launch Expertise: Proven success in launching major blockchain products or networks (including token launches) and growing communities from inception to scale. Youve taken projects from zero to one and beyond and can point to communities or user bases youve built from the ground up. Blockchain & DePIN Knowledge: Deep expertise in blockchain technology, decentralization principles, and emerging Web3 trends like DePIN (Decentralized Physical Infrastructure Networks). Fluent in crypto culture and communities, you understand what resonates with developers, node operators, degens and enthusiasts alike. Strategic & Innovative Mindset: Visionary strategist who can see the big picture but also get hands-on. You arent afraid to challenge conventional marketing tactics willing to throw out the old playbook and experiment with novel, even provocative, approaches to spark growth. Communication & Public Presence: Exceptional communication, storytelling, and writing skills. A bold communicator who can inspire action through clear messaging. Confident public speaker comfortable representing the company on stage, in webinars, and on social channels. Leadership & Team Building: Proven ability to lead and inspire teams. You have built and managed high-performing marketing or community teams, and you know how to mentor talent and foster a collaborative, results-driven culture. Data-Driven Approach: Metrics-focused mindset with proficiency in analytics tools (e.g. Google Analytics) to measure campaign performance. You make decisions based on data and user insights, and you iterate quickly to optimize outcomes. Network & Relationships: Extensive network and credibility in the Web3/crypto space, with relationships across media, key opinion leaders (KOLs), and community influencers. Able to leverage your connections to boost visibility and partnership opportunities.




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  • Open Application  

    - Ayr
    Open ApplicationWho is SerotoninSerotonin is the top go to market firm... Read More

    Open Application

    Who is SerotoninSerotonin is the top go to market firm for transformative technologies, specializing in marketing, strategy, recruiting, and legal services. With a global team of 90 across 15 countries, Serotonin has supported over 300 clients in consumer tech, web3 infrastructure, digital assets, venture capital, and AI since its launch in 2020. Delivering end-to-end go-to-market solutions across all major marketing channelsincluding public relations, growth marketing, on-chain analytics, content, research, social, and designSerotonin accelerates global innovation. At the core of our business is the Serotonin Platform, serving as a central nucleus for the web3 ecosystem, connecting builders and founders with essential resources to drive business growth.
    Open ApplicationWe're always on the lookout for talented, passionate individuals who want to make an impact. If you dont see a role that matches your background but believe youd be a great fit for our team, wed still love to hear from you. Submit your resume and a brief note about the kind of work you're interested in.
    We're actively reviewing these applications and will reach out if an opportunity opens up that aligns with your skills and interests.




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Astrid-Lindgren-Weg 12 38229 Salzgitter Germany