Senior Blockchain Developer — Launch Custom L2 Network

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We're looking for an experienced Senior Blockchain Developer to join us at an early stage and help build a custom Layer-2 blockchain network based on Arbitrum Orbit, Avalanche Subnets, or other modern frameworks.

This is a high-impact role with strong technical ownership — you'll shape core architecture and work hands-on with network infrastructure from the ground up.

 Responsibilities:

  • Contribute to choosing and shaping the chain architecture (optimistic rollup, subnet, etc.).

  • Set up foundational infrastructure (testnet / DevNet / MVP).

  • Deploy and manage core components — nodes, sequencers, bridges, etc.

  • Ensure EVM compatibility and customize gas/token models as needed.

  • Help maintain DevOps, monitoring, and security processes.

Requirements:

  • Solid experience with blockchain infrastructure (beyond smart contracts).

  • Strong understanding of Ethereum and EVM internals.

  • Hands-on exposure to one or more frameworks such as:

    • Arbitrum Orbit

    • Avalanche Subnets

    • Others (L2 frameworks)

  • Proficient in Solidity, plus at least one of: Go, Rust, TypeScript.

  • Familiarity with infrastructure tooling: CI/CD, observability, cloud environments.

Nice to have:

  • Knowledge of rollup architectures (optimistic, zk).

  • Experience working on or launching custom networks.

  • Background in zero-knowledge systems, cryptography, or custom VMs.

What we offer:

  • Remote + full-time in EU timezone. Working with the founder and the business team..

  • Direct collaboration with founders and technical decision-makers.

  • High-impact role with real influence on architecture and strategy.

  • Competitive compensation


Posted on: 9/28/2025

Upsilon IT

Upsilon IT

Upsilon is a product studio working as a marriage of two businesses: we build our own B2B SaaS products and act as a tech partner for fast-growing companies.

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