Full‑Stack Engineer

Blue is building the trust layer the AI economy has been waiting for — a protocol for structured, verifiable, multi-party agreements that execute deterministically, leave an audit trail, and work across any system. Think smart contracts, minus the blockchain overhead.

Our products are already being built and tested with real integrations:

PayNotes

Programmable payments with conditional capture, milestone releases, refunds, vouchers, and partner settlement.

MyOS

SaaS orchestration layer for merchants and agents. Cross-platform trust, without writing a line of Blue Language yourself.

• 7+ years building and shipping production systems as a full-stack engineer
• Backend expertise: Node.js, TypeScript — design systems correct under load and failure
• Frontend: React; build polished, production-ready interfaces
• Distributed systems knowledge: consistency, state transitions, concurrency, retries, failure handling
• Proven in stateful, event-driven systems where correctness matters
• AWS production: Lambda, API Gateway, SQS/SNS, EventBridge, IAM, CloudWatch, RDS
• IaC: AWS SAM, CloudFormation
• PostgreSQL: schema design, transactions, indexing, migrations, performance tuning
• Design for idempotency, auditability, deterministic execution
• Observability: monitoring, logging, alerting, incident response
• Own features end-to-end: product shaping through post-release accountability
• Comfortable using LLMs, coding agents, modern AI tooling
• Fluent English and Polish, written and spoken

Nice to have:

• Payments/fintech, ledgering, settlement, transactional systems
• Document workflows, approvals, multi-party business processes
• Systems of record with strict audit/compliance requirements
• Early-stage startup or small, high-talent engineering team experience
• Products where reliability and correctness outweigh surface-level shipping

• 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, 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