Senior / Staff Full-Stack Engineer (Node.js + AWS)

Technologies we use

About the project

Your responsibilities

• Design and ship full-stack features across payments, document workflows, and agent orchestration
• Build and maintain stateful systems that demand idempotency, auditability, and safe retry logic
• Own AWS infrastructure — architecture decisions, serverless systems, IaC (SAM / CloudFormation), monitoring, cost, and security
• Work with PostgreSQL-backed services and event-driven components
• Use modern AI tooling (LLMs and coding agents) to accelerate development and experimentation

Our requirements

• 7+ years of experience building and shipping production systems as a full-stack engineer
• Strong backend expertise in Node.js and TypeScript — not just building APIs, but designing systems that stay correct under load and failure
• Strong frontend skills with React, including the ability to build polished, production-ready product interfaces without depending on a separate frontend team
• Solid understanding of distributed systems: consistency, state transitions, concurrency, retries, failure handling, and eventual consistency trade-offs
• Proven experience building stateful, event-driven systems where correctness matters
• Hands-on experience with AWS in production, especially Lambda, API Gateway, SQS/SNS, EventBridge, IAM, CloudWatch, RDS, and serverless architecture patterns
• Strong experience with Infrastructure as Code, ideally AWS SAM and CloudFormation
• Strong PostgreSQL skills, including schema design, transactions, indexing, migrations, and performance tuning
• Experience designing systems with idempotency, auditability, and deterministic execution built in from the start
• Ability to debug and stabilize production systems end-to-end — across application code, infrastructure, data, and runtime behavior
• Strong grasp of observability, monitoring, logging, alerting, and incident response
• Good judgment around security, reliability, and cloud cost, with the ability to make pragmatic architectural trade-offs
• Ability and willingness to own features end-to-end — from product shaping to implementation, deployment, and post-release accountability
• Comfortable operating in a high-trust, high-autonomy environment with very little hand-holding
• Strong product and engineering judgment — you ask the right questions early, and you do not need heavy process to move fast responsibly
• Comfortable using LLMs, coding agents, and modern AI tooling as part of your development workflow
• Fluent English and Polish, written and spoken

Optional

• Experience in payments, fintech, ledgering, settlement, or transactional systems
• Experience with document workflows, approvals, or multi-party business processes
• Experience working on systems of record or products with strict audit/compliance expectations
• Experience at an early-stage startup or in a small, high-talent engineering team
• Experience building products where reliability and system correctness matter more than shipping surface-level features

This is how we organize our work

This is how we work

What we offer

• Competitive B2B compensation based on experience
• Equity — own a piece of what you build
• Fully remote work in an async-first environment
• Direct collaboration with the founding team
• High autonomy and fast decision-making
• Small team, outsized impact
• Work on technology that is genuinely novel
• End-to-end ownership across product, systems, and production
• Protocols don’t get built by committees. They get built by small teams who understood the problem before anyone else did