Senior Fullstack Engineer - Next.js / React / Node.js

Hi there,

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

We’re looking for a Senior Fullstack Engineer - a seasoned developer who thrives on building complex SaaS products, internal platforms, and automation-driven applications. You’ll work across the stack: from elegant frontends to scalable backends, from API integrations to deployment pipelines.

If you’re the kind of engineer who can see the whole system, challenge architecture decisions, and still deliver production-ready code, you’ll feel right at home here.

What You’ll Do

• Own and deliver end-to-end features for SaaS products and internal applications.

• Build and scale frontends (Next.js) and backends (Node.js, Nest.js).

• Design and integrate APIs (REST, gRPC, WebSockets), handling real-world complexity (rate limits, retries, auth flows).

• Collaborate with Product Managers and engineers on architecture and technical direction.

• Shape automation features that reduce manual work across the company.

• Work with databases (PostgreSQL, Clickhouse) for data modeling, analytics, and performance tuning.

• Ensure quality through code reviews, automated testing, CI/CD pipelines, and observability.

• Act as a senior reference point in the team - share knowledge, support less experienced developers, and help maintain high engineering standards. You’ll report directly to the Head of Frontend Engineering.

What We’re Looking For

• 5+ years of professional full-stack development experience (preferably in SaaS).

• Strong expertise in Next.js and React.js - production-grade apps, design systems, performance optimization.

• Solid backend engineering skills with Node.js (Nest.js a plus).

• Track record of building and maintaining scalable SaaS platforms or internal tools.

• Deep understanding of API integrations and distributed system patterns.

• Good knowledge of PostgreSQL / SQL.

• Familiarity with CI/CD pipelines and cloud environments (AWS, Vercel, DigitalOcean).

• Nice to have: event-driven architecture (RabbitMQ, Kafka, Redis Streams), and experience with Supabase

• Strong communication skills - able to explain technical trade-offs to engineers and Product Managers.

• Fluent in English and Polish.

Our Tech Stack

• Frontend: React.js, Next.js

• Backend: Node.js, NestJS, Golang, Elixir

• Messaging & Queues: RabbitMQ (LavinMQ), Redis Streams, Kafka

• Data: PostgreSQL, BigQuery, Clickhouse

• Infrastructure: AWS, Vercel, DigitalOcean, Fly.io, Google Cloud

• CI/CD / Git: Gitlab with Gitlab CI

• AI/ML & Automation: Proprietary GenAI models, integrated ML pipelines, orchestration tools

• Integrations: REST, gRPC, WebSockets, external APIs with rate limits

Why Join Us?

• Work on complex, high-scale SaaS applications that few companies dare to build.

• 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.

• Competitive senior-level compensation and career growth.

• Social impact - contribute to automation products that empower businesses and communities.

Our Streamlined Hiring Process

1. Initial call with one of our team members.

2. Technical deep-dive with our Head of Frontend Engineering and the CTO.

3. Welcome aboard!

📩 Apply now and help us shape the future of SaaS automation at Web Impact!