Senior Full Stack Engineer (Typescript)

Senior Full Stack Engineer: Improbable

Improbable

Improbable is a Venture Builder. We are working with leaders to create businesses in AI transformation, the metaverse and web3. We both create businesses from scratch and invest in existing businesses. Our central services teams work with ventures to help them achieve success; including early stage prototyping and initial product development where this role sits. At Improbable, you are surrounded by people who want to improve everything and everyone around them, and who compel you to improve yourself. We’re motivated by the fulfilment of solving hard problems to achieve something profound and transformative.   Your Mission As a Senior Full Stack Engineer at Improbable, you will work with Ventures to help them get to market faster. You will work with their leadership team, to design, prototype and launch initial versions of their product. This is a hands-on, strategic role where you will collaborate with executives, working all the way from identifying customer problems. About the Role We're looking for a Full-Stack Engineer to build across the breadth of what Somnia ships, from consumer-facing products to developer technologies to internal platform and tooling. One month that's a polished end-user app, the next it's an SDK, a CLI, or the internal systems the rest of the team builds on. This is a role for someone who cares as much about the product as the code. You'll own the full lifecycle, from rapid prototyping to deployment. You use AI tools as a multiplier and like shipping end-to-end. What you’ll be doing * Design and build production-grade products end-to-end—back-end through UI—across consumer apps, developer-facing technologies and internal platform tooling. * Build the high-performance back-ends and services these products depend on. * Create developer technologies—SDKs, APIs, CLIs, libraries and starter kits—that make the platform easy to build on. * Build internal tooling and platform infrastructure that raises the velocity of the whole team. * Work self-directed: watch the ecosystem and the team's needs, spot gaps and propose and build what moves things forward. * Work with DevRel, Marketing and BD so what you build lands with users and developers and fits go-to-market. What we’re looking for * Strong TypeScript across the full stack—this is the core of the role and our app stack. Some Golang where it fits. * Build high-quality, production-ready frontends. * Strong back-end engineering—APIs, services and the data layer behind them. * Genuine interest in crypto and on-chain products. * Strong ownership and self-direction—you generate ideas, not just execute them. * Able to turn the dial: prototype fast and loose to prove a feature out, then shift into steady-state mode to harden what's worth keeping—tests, edge cases, reliability.   Improbable Candidate Privacy Policy

Senior Full Stack Engineer- Somnia

Improbable

At Improbable, we build and scale ambitious AI and Web3 ventures shaping the next generation of the internet. The Somnia Foundation, backed by Improbable, specialises in building and operating high-performance decentralised technology. Its EVM L1, launched in 2025, has been benchmarked as the fastest on the planet: at over 1 million ERC-20 transactions per second. At Somnia you'll be working alongside a talented team working across the core blockchain along with novel protocols leveraging its capabilities. About the Role We're looking for a Full-Stack Engineer to build across the breadth of what Somnia ships, from consumer-facing products to developer technologies to internal platform and tooling. One month that's a polished end-user app, the next it's an SDK, a CLI, or the internal systems the rest of the team builds on. This is a role for someone who cares as much about the product as the code. You'll own the full lifecycle, from rapid prototyping to deployment. You use AI tools as a multiplier and like shipping end-to-end. What you’ll be doing * Design and build production-grade products end-to-end—back-end through UI—across consumer apps, developer-facing technologies and internal platform tooling. * Build the high-performance back-ends and services these products depend on. * Create developer technologies—SDKs, APIs, CLIs, libraries and starter kits—that make the platform easy to build on. * Build internal tooling and platform infrastructure that raises the velocity of the whole team. * Work self-directed: watch the ecosystem and the team's needs, spot gaps and propose and build what moves things forward. * Work with DevRel, Marketing and BD so what you build lands with users and developers and fits go-to-market. What we’re looking for * Strong TypeScript across the full stack—this is the core of the role and our app stack. Some Golang where it fits. * Build high-quality, production-ready frontends. * Strong back-end engineering—APIs, services and the data layer behind them. * Genuine interest in crypto and on-chain products. * Strong ownership and self-direction—you generate ideas, not just execute them. * Able to turn the dial: prototype fast and loose to prove a feature out, then shift into steady-state mode to harden what's worth keeping—tests, edge cases, reliability.   Improbable Candidate Privacy Policy

Senior Full Stack Engineer

Junior

👶 ABOUT JUNIOR We're building cutting-edge LLM-powered tools that supercharge investment research for the world's most demanding deal teams. Our clients include several of the top 10 global private equity firms, Big 4 professional services firms, and leading consulting practices: organisations responsible for deploying billions of dollars annually. We're a profitable, bootstrapped company with a growing team of ~28 people based in London and New York. We 10x'd our revenue in 2025 and are on track to grow 2-3x again this year. Junior saves clients an average of 10 hours per week, and we're expanding fast into new verticals including investment banking, hedge funds, and research firms. 💡 ROLE DESCRIPTION As one of our first engineering hires, you'll have the unique opportunity to: * Ship quickly * Design and build new modes of working with computers * Work on groundbreaking projects involving LLMs * Collaborate closely with our external partners to fuel our growth * Contribute to product decisions, direction and prioritization * Shape our engineering culture 🔧 SAMPLE SET OF PROJECTS * Build new frontier products at Junior to ingest more types of research inputs * Build a voice-to-voice survey tool with extremely low latency that can autonomously conduct high volume of research tasks * Build a mobile app from scratch in 3 weeks * Create segmented knowledge graphs built on top of the output of unstructured ⇒ structured data transformations * Build an AI native CRM system with deep links to the knowledge graph above 🔥 ABOUT YOU We're looking for product-minded full-stack engineers who: * Based in NYC * Are eager to contribute to product decisions * Have strong communication skills and a desire for a client-facing role * Are proficient in our tech stack: Next.js, TypeScript, PostgreSQL * Bonus points for experience building & designing AI-powered products! * Feel like you are never building fast enough 🌵 BENEFITS All the usual benefits (competitive pay and equity, private healthcare etc). Unusual benefits: * Gym membership * In-office cook * Summers working in Greece by the beach If you're excited about the opportunity to drive innovation at Junior, we'd love to hear from you!We can't wait to meet you! 🙌