Senior FullStack Developer Product Team

SimpleSign - Stockholm (Karlavägen 20) Hybrid

Were building a tight product-led engineering team that ships fast learns fast and has real impact across the company. SimpleSign gives you the ownership and velocity of a startup with 14 years of profitable bootstrapped stability behind it. If you enjoy owning customer-facing features end-to-end working with modern tools and experimenting responsibly with AI and agentic workflows come join us.

About the team

This is a small highly-collaborative team based in Stockholm. Engineers here have direct access to strategic product decisions and leadership. Youll work closely with product design sales and customer success to take SimpleSign to the next level.

The role what youll do

Youll own product areas end-to-end and have a visible impact on customers and company outcomes. Typical responsibilities:

• Design build and operate customer-facing features from discovery to production and monitoring.

• Work day-to-day with founder and CPTO to translate product strategy into shipped outcomes.

• Lead API frontend and architecture decisions and introduce patterns that keep the codebase healthy.

• Mentor teammates and raise engineering standards in the team

• Build safe measurable AI and agentic workflows that add clear user value and improve our internal workflows.

• Support demos integrations and occasional technical sales conversations.

Broad tech overview (high level)

Were pragmatic and TypeScript-first TypeScript experience is a plus but not mandatory.

• Frontend: React (v19) Vite modern routing and server-state patterns.

• Backend: NestJS on Node Prisma PostgreSQL Redis queues for background processing.

• Realtime & Collaboration: Build low-latency collaborative experiences (multi-user editing presence sync).

• AI & Data: Customer-facing AI with LLMs embeddings/vector stores and safe orchestration patterns.

• Cloud & Tooling: GCP terraform OpenAPI/Swagger for contracts Docker/CI observability and automated testing.

About you

• Several years building production web applications (full-stack or strong single-stack with willingness to work across the stack).

• Comfortable owning features end-to-end: API design frontend UX data models and production monitoring.

• Product-minded: you prioritise user outcomes and measurable impact over vanity metrics.

• Strong communicator: youll work directly with founder CPTO and cross-functionally across teams.

• Curious about AI and agentic workflows hands-on LLM/vector DB experience is a plus but eagerness to learn matters most.

• TypeScript experience is a plus but not mandatory.

• English is the working language; Swedish is a bonus.

How we work & how youll grow

Helping SimpleSign win helps you win. Practically that looks like:

• Care about your work your team and our users - that perspective guides our priorities engineering trade-offs and roadmap choices.

• Ship fast toward team and company objectives.

• Give and receive direct feedback; learn quickly and iterate.

• Fix problems when you see them - early course corrections are expected.

Our product team is small and highly visible: your work will be directly tied to company outcomes and expansion.

Why SimpleSign

• Real ownership on customer-facing product areas.

• Stability autonomy: 12 years bootstrapped and cash-positive yet still nimble.

• Direct collaboration with management - strong product influence for engineers.

• Modern learning culture that experiments responsibly with AI and new tooling.

• Hybrid office in Stockholm (Karlavägen 20) friendly team and competitive compensation.

Practical note

Were unable to provide relocation assistance or sponsor work permits at this time. Please apply only if you already have the right to work in Sweden (a valid Swedish work permit).

In the application message (or cover note) please include a short note about a technical or product project youre proud of links to GitHub a portfolio or a live demo are welcome. Also tell us which parts of the stack you enjoy owning and any AI/agent experiments youve worked on or explored.