Senior Staff Full-Stack TypeScript Engineer / Tech Lead

Kozak Agency · Custom Software Development · JavaScript · TypeScript · Node JS · 5 days ago
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Location
Remote (Poland)
Seniority
Staff
Employment
Full-Time

First seen by Alion on Nov 6, 2026.

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Kozak Agency

100+ products shipped across web, mobile, and AI since 2015. 40+ engineers, 8 industries, one team. Book a free discovery call and get a scoping estimate.
kozak-ag.com · Kraków · Kyiv · Custom Software Development · Est. 2015
Tech stack of Kozak Agency

Location: Poland (Kraków preferred)
Work format: Full-time
Project: International fintech payments platform combining traditional payment systems with crypto infrastructure.

Responsibilities:
Build and scale a modern fintech payments platform.
Develop real-time processing, settlement, reconciliation, and wallet services.
Provide technical leadership for teams of 5–15 engineers.
Drive architectural decisions, conduct code reviews, and mentor engineers.
Stay hands-on with daily coding and end-to-end technical ownership.

Requirements:
8+ years of production experience with TypeScript/JavaScript (frontend & backend).
Strong expertise in React, Node.js, and GraphQL/Apollo.
Hands-on experience with AWS Serverless architecture.
Strong knowledge of DynamoDB/NoSQL and PostgreSQL.
Proven experience leading technical teams of 5–15 engineers.
Experience with AI-assisted development tools, including 1+ year with Anthropic Claude.
Tech stack: TypeScript, React 19, Node.js, GraphQL/Apollo, AWS, DynamoDB, PostgreSQL, Playwright, CDK.

Nice to have:
Experience in fintech/payments, settlement systems, PCI compliance, ledger systems, or fee models.

Important: Candidates must be physically located in Poland. Kraków is preferred, but other Polish cities are also considered !!!!

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