Fullstack Engineer (AI, Distributed Systems, Automation)

About the Position

At Web Impact, we’re more than just an email marketing agency and digital solutions provider. We build cutting-edge, socially impactful products that redefine how businesses operate in the digital world.

We’re looking for a Fullstack Engineer who enjoys building complex systems, integrating external services, and leveraging AI tools to speed up development and automate workflows.

If you’re excited about combining modern frontend development with AI-driven workflows and automation tools like Claude Code, Cursor, and LLM frameworks, this one is for you.

Responsibilities

• Develop and contribute to end-to-end features across SaaS products and internal tools, collaborating with senior engineers on architecture and implementation decisions.
• Build modern, high-performance frontends using Next.js and React.js.
• Develop scalable backend services using Node.js / NestJS.
• Design and integrate APIs (REST, WebSockets, external services).
• Build and maintain automation workflows and background jobs.
• Work with async systems, queues, and event-driven architectures.
• Integrate third-party services with real-world constraints (rate limits, retries, auth flows).
• Use AI tools to improve development speed, testing, and automation.
• Collaborate directly with product, data, and leadership teams.
• Build MVPs, proof-of-concepts, and new product ideas from scratch.
• Rapidly validate business ideas through experimentation and iteration.
• Help evolve successful prototypes into production-ready systems.

Requirements

• 2,5+ years of professional full-stack experience.
• Strong frontend skills in React.js / Next.js.
• Backend experience with Node.js (NestJS preferred).
• Experience integrating external APIs (auth, pagination, retries, rate limits).
• Hands-on experience with modern AI tools (OpenAI, Claude, Cursor, etc.).
• Good SQL skills (PostgreSQL preferred).
• Experience working with async processing, queues, and background jobs.
• Understanding of building reliable systems (error handling, retries, observability).
• Strong communication skills and ability to work cross-functionally.
• Fluent in English and Polish.

Nice to Have

• Experience with Rust (async, Tokio, Axum).
• Experience with Elixir (Phoenix LiveView, GenServer).
• Understanding of distributed systems and architectures.
• Experience with multi-region deployments and geo-distributed infrastructure.
• Experience building systems with high parallelism (a large number of workers processing jobs concurrently).
• Familiarity with distributed databases and data consistency trade-offs.
• Experience with multi-tenancy architectures (tenant isolation, scaling strategies).
• Experience working with high-throughput event pipelines.

We Offer

• Work on high-scale SaaS systems processing hundreds of millions of events daily, with real-time pipelines and data-heavy workloads.
• Ownership from day one - influence architecture, technology choices, and product direction.
• Collaborate with world-class engineers, AI specialists, and PMs.
• Innovation-first culture - explore cutting-edge frameworks and architectures.
• Fast execution, minimal bureaucracy, no unnecessary meetings.
• Opportunity to work with modern AI tooling in production.
• Competitive senior-level compensation and career growth.
• Social impact - contribute to automation products that empower businesses and communities.

Our Tech Stack

• Frontend: Next.js, React.js
• Backend: Node.js, NestJS, Golang, Elixir, Rust
• Data: PostgreSQL, BigQuery, ClickHouse
• Infra: AWS, Fly.io, Google Cloud, DigitalOcean
• Queues & Workers: LavinMQ, BullMQ, Kafka
• CI/CD: GitLab CI
• AI/ML & Automation: Proprietary GenAI models, OpenAI, Claude, internal tooling
• Integrations: REST, gRPC, WebSockets, external APIs with rate limits

About the Company

Web Impact is a dynamic company operating in the digital solutions and email marketing industry. The company is dedicated to creating cutting-edge, socially impactful products that transform business operations in the digital realm. Web Impact emphasizes a product philosophy that focuses on building seamless, user-friendly applications that integrate into existing platforms like Slack, email, and spreadsheets, minimizing friction and maximizing immediate value. The company is characterized by its innovative approach, leveraging AI and automation to streamline workflows and eliminate manual tasks. Web Impact boasts a global, multicultural team with operations in the U.S. and Europe, and offers a modern tech stack with a focus on automation. The company values full ownership, independence, and flexibility, providing a remote-friendly work environment with a Warsaw office available for those who prefer an in-office setting. Web Impact is committed to quick feedback and fast execution, offering direct access to leadership for efficient decision-making.