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Senior Fullstack Engineer (f/m/d)

Upvest GmbH· Engineering
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Hybrid (Berlin), Hybrid (Tallinn)Full-timePosted 4w ago

About the role

Senior Fullstack Engineer focused on building value for clients across React/TypeScript frontend and Go backend services, with emphasis on quality, security, auditable actions, and AI-enabled tooling within Upvest’s Upfront/Clients Tribe.

Responsibilities

  • Take operational problems from concept to production, working across our React/TypeScript frontend and Go backend services.
  • Own modern interface security. Upfront is where external users act on real end-user data, so you will tackle per-client isolated environments, least-privilege access, and Auth0 integrations in a regulated space.
  • Expand the operational surface across Upvest's internal domains and develop a deep understanding of how our core systems piece together.
  • Help define how software delivery works in an AI-enabled company by pushing AI tooling to its limits to maximize quality and speed while staying compliant.
  • Build agentic operations as we move toward exposing Upfront over MCP. Every action requires a strict audit trail, so you will solve real design problems around what an agent can do autonomously versus what requires human intervention.
  • Work in weekly cycles with bi-weekly retrospectives to prioritize high-quality, high-frequency shipping.

Qualifications

  • A strong product engineering mindset where you care about the 'why' just as much as the 'how' and proactively bring ideas to the table.
  • Solid backend experience in Go, Java, or Kotlin (we build in Go but will give you time to ramp up).
  • Practical experience building modern client-facing interfaces using React and TypeScript.
  • Experience building products that require per-customer configuration without devolving into a custom fork per client.
  • Deep knowledge of authentication, authorization, and security best practices.
  • A strong focus on quality, extensibility, and automated testing.
  • True end-to-end ownership across containers, CI/CD pipelines, and relational data modeling.
  • A working understanding of event-driven architectures.
  • A pragmatic approach to engineering and the ability to make smart tradeoffs under constraints.
  • Real-world experience using AI tools to drive software engineering workflows, not only writing code snippets .
  • The ability to navigate undefined problems and align other teams without needing formal authority.

Skills

Required:Frontend developmentBackend developmentSecurity and authenticationSecurity auditing / complianceAI tooling in software engineering

Benefits

  • Best-in-class AI tools: Every Upvenger has €20,000 per year to spend on the best AI tools available
  • Impact-driven work: Build infrastructure powering the future of investing in Europe
  • Wellbeing: 30 days of annual leave, sports benefits, confidential professional coaching, remote work abroad up to 183 days/year, UpRest sabbatical after every 4 years
  • Development: Personal development budget
  • Flexible work environment: Hybrid/remote options across Europe, hubs in Berlin, London, Tallinn
  • Compensation and equity: Competitive salary and equity program
  • Team celebrations: Company-wide events and celebrations
  • Inclusion: Employee Resource Groups such as Upfem and UpVergent
Last updated Sep 23, 2026. Interested? Apply on the company site.

About Upvest GmbH

One Investment API, to build any investment experience.

Upvest GmbH is supported by the Pro FIT-Program of Investitionsbank Berlin with the goal to research and develop a prediction tool for blockchain transaction fees. This project was co-financed by the European Fund for Regional Development (EFRE).

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