Full-stack engineers at HASH implement user-facing features, working on both frontend and backend while optimizing data structures and performance. They collaborate with UX/UI designers and company leadership.
About HASH
About the role
Requirements
What you'll work on
Benefits
HASH's open-source platform helps firms integrate both structured and unstructured information into knowledge graphs that support simulating, optimizing and automating processes. Our mission is to solve information failure, and help everybody make the right decisions. To that end, we're unapologetically excited. Actions speak louder than words, and we measure performance by output. We prioritize speed, and measure product delivery timelines in hours and days, not months and years. We value high-energy, high-expectations people who do what they say and say what they mean. We're committed to building a high-commitment, high-trust environment, and believe that the best teams are most productive together, in-person. We're therefore currently hiring exclusively in both London (UK) and Berlin (Germany) to join the firm.
Full-stack engineers implement the majority of HASH's user-facing features. They write code on the frontend and backend, unblocking themselves, and ensuring HASH responds to user needs and ships new functionality fast. We are hiring new engineers based in London, UK as well as Berlin, Germany to join our team in-person.
- You must possess expert-level proficiency in TypeScript and React. Additional experience with Rust is nice-to-have but not required.
- Experience working with Effect and HTML Canvas, as well as frontend graphics and animation libraries are also beneficial, as is familiarity using and customizing component libraries such as Material UI, Base UI or Ariakit, and working with type-safe styling systems like Panda.
- You should be interested in not only moving fast, but also in building performant solutions.
- In this full-stack role, you should be as comfortable optimizing data structures and storage systems as you are in pushing front-end web frameworks to their limits. If you are more interested in frontend engineering only, see our separate FE Engineer opening(s).
- You'll work on both the frontend and backend of new features at HASH, touching most parts of the HASH codebase.
- The vast majority of your work will be open-source, and many of the components you build should be designed modularly, supporting their use in third-applications, as well.
- You'll collaborate directly with experienced, organized, and technical UX/UI designers in addition to company leadership (both the CEO and CTO).
We offer leading equity-weighted total compensation, including competitive salaries and tax-advantaged options. We also offer:
- Employer pension contributions
- At least 30 days holiday annually
- Quarterly in-person team retreats around the world
HASH's founders have previously founded and sold companies like Stack Overflow and Trello for hundreds of millions and billions of dollars.
This role pays £70,000-£120,000 base/bonus + meaningful equity.
Similar Jobs
Information Technology • Software • Consulting
Design and deliver end-to-end features across Java Spring Boot APIs and TypeScript/React frontends. Contribute to AWS cloud-native infrastructure, EKS/Kubernetes migration, CI/CD pipelines, security scans, and integrations with third-party financial platforms. Participate in design, code review, mentoring, and AI-augmented development within a small cross-functional banking engineering team.
Top Skills:
Aws Ec2Aws Rds Aurora (Mysql)Ci/CdClaudeContainer Security ToolingCopilotCursorDockerDynamics 365DynamoDBEksGithub ActionsJavaJenkinsKubernetesMambuMicroservicesOpenapi/SwaggerReactRestSast/DastSonarcloudSpring BootTrivyTypescript
Artificial Intelligence • Machine Learning • Music • Generative AI
Integrate a partner client application with internal services, migrate users and data to cloud infrastructure, update frontend UI/UX for migration workflows, modify Node.js/TypeScript backend for correct data mapping, and rapidly troubleshoot integration issues during testing and rollout.
Top Skills:
Cloud InfrastructureExpressJwtNestjsNode.jsOauthReactRest ApisTypescriptVueWebsockets
Information Technology • Consulting
Backend-leaning senior full-stack engineer for B2B SaaS: design and build secure, scalable Java (OpenJDK)/Spring Boot services on Azure, architect PostgreSQL and Elasticsearch, implement Kafka messaging, develop Angular frontends, containerize with Docker/Docker Compose, maintain CI/CD and SonarQube quality, and collaborate with the Chief Architect.
Top Skills:
AngularApache KafkaCi/CdDockerDocker ComposeElasticsearchJava (Openjdk)AzurePostgresRestful ApisSonarqubeSpring Boot
What you need to know about the London Tech Scene
London isn't just a hub for established businesses; it's also a nursery for innovation. Boasting one of the most recognized fintech ecosystems in Europe, attracting billions in investments each year, London's success has made it a go-to destination for startups looking to make their mark. Top U.K. companies like Hoptin, Moneybox and Marshmallow have already made the city their base — yet fintech is just the beginning. From healthtech to renewable energy to cybersecurity and beyond, the city's startups are breaking new ground across a range of industries.
