Fullstack Engineer
Spiich Labs AB · Stockholm · Tills vidare · Deadline 2026-12-31
Spiich Labs AB is recruiting a **Fullstack Engineer** to join its engineering team in Stockholm. Working **fully on-site**, the role involves owning and shipping features end-to-end, ranging from backend infrastructure and database schemas to user interfaces for sales representatives. Key responsibilities include designing robust integrations with third-party systems such as CRMs, calendars, and email providers, reducing latency through query optimisation and caching, and maintaining horizontal system scalability to achieve response times under 200 milliseconds. The role comes with qualified employee stock options (QESO) from day one. Candidates must be comfortable working across the entire stack using **TypeScript and React**, with demonstrated experience handling API integrations, webhooks, and OAuth flows. Applicants should be adept at navigating early-stage environments, fast-paced iteration, and performance optimization, alongside an interest in emerging technologies like large language models and knowledge graphs. The selection process includes an introductory call, a technical interview, a take-home assignment, and a mandatory two-day **on-site trial work period** with the team.
TL;DR
We're looking for a Fullstack Engineer to ship features end-to-end — from database to UI. You'll build rock-solid systems that connect to CRMs, email providers, calendars, and sales tools, plus the interfaces reps use every day, while keeping latency low and reliability high. Must be obsessed with clean architecture, fast systems, and extreme ownership.
Why join
We’re a small, talent-dense team of engineers building a generation-defining company from Stockholm. We value speed, rigour, and extreme ownership. If you're obsessed with product, thrive in ambiguity, and want to push the edge of what agents can do, you’ll feel at home.
You'll work on hard problems across the stack - building resilient integrations with enterprise systems, optimizing database queries, reducing API latency, and shipping the interfaces sales reps live in every day. Not another CRUD app.
We're backed by founders and operators behind Lovable, OpenAI, Tandem Health, and Neo4j. Our customers across 10 countries report 90% less prospecting time, 3x market coverage, and 2x customer meetings.
What you'll do (responsibilities)
In one sentence: Ship features end-to-end — from the infrastructure that makes AI agents reliable, fast, and scalable to the interfaces reps use daily.
- Own features across the stack: Build complete slices — database schema, API, and React UI — and ship them to customers
- Own integrations end-to-end: Design and build integrations with CRMs, email, calendars, and sales tools
- Reduce latency relentlessly: Optimize database queries, implement caching strategies, and eliminate bottlenecks
- Scale the system: Design for horizontal scaling, handle increased load, and maintain <200ms response times
- Ship fast: Test ideas, run experiments, iterate daily on real customer feedback
- Shape the architecture: Make foundational decisions on database structure, API design, and system patterns
Who you are
- Cracked engineer obsessed with building great software
- Comfortable with ambiguity, early-stage chaos, and fast iteration
- Thrive on new tech - LLMs, knowledge graphs, agents, you name it
- Experience with API integrations, webhooks, OAuth flows, and third-party systems
- Comfortable across the stack: TypeScript on both sides, React on the front
- Care deeply about performance, observability, and operational excellence
- Care more about solving problems than polishing abstractions
- Fully committed to the mission: not "just a job"
What we offer
- A team of obsessed engineers, full of speed, rigour, and grit
- Mission-driven, no-BS culture: experiment, ship, learn
- Meaningful equity through qualified employee stock options (QESO) from day one
- Fully on-site in Stockholm - we believe in working together
- Top-tier compensation package
Our stack
- Frontend: React
- Backend: Typescript, Neo4j, PostgreSQL, Node.js, Express
- Infrastructure: Docker, Google Cloud
- Agent: Typescript, LLMs (Claude, OpenAI, Gemini), Mastra
About Spiich Labs
Spiich is the agentic platform for sales teams. Reps focus on the human work — building relationships, building trust, and closing deals — while Spiich agents handle everything else: prospecting, lead generation, CRM updates, meeting prep, follow-ups, and everything in between. The system integrates knowledge graphs, memory, and agentic workflows to deliver real help - not just summarisation or search. We're backed by founders and operators behind Lovable, OpenAI, Tandem Health, and Neo4j.
How we hire
1. Submit your application
2. Intro call with the team
3. Technical interview
4. Take-home exercise
5. Join us for trial work lasting 2 days on-site. We'll see how you tick and you get to meet the team and explore whether joining Spiich feels right for you.
We move fast — the full process typically takes under two weeks.
How to Apply
Drop us a line at filip@spiich.ai with your GitHub/LinkedIn, a note on why this excites you, and your proudest achievement. No CV needed.