# Senior Blockchain Engineer

We've been building digital products for over 10 years, with a strong focus on Blockchain-based applications. At 4soft, people come first - it's our team of passionate technologists that enables us to work with international clients and deliver innovative solutions. We believe in transparency, effective teamwork, and achieving real business outcomes for those we serve. As a Senior Blockchain Engineer, you’ll work directly with the client’s team as a dedicated engineer throughout the project. If you have experience building production financial infrastructure and care about the security of digital asset operations, this is your place. Tech environment: MPC / custodial wallet platforms (Fireblocks, DFNS or similar), API integrations, stablecoins, DeFi (vaults), Web3 As a Senior Blockchain Engineer, you will be responsible for: Helping scope a pilot that may initially include manual steps, and designing a path toward automation Building solutions on top of an MPC custody platform: lender and borrower accounts, collections wallets, transfers, and sweeps Defining transaction policies and pre-execution checks, including tight controls on permitted destinations Integrating outputs from

- **Id**: 3809934
- **Url**: <https://alion.io/job/4soft-senior-blockchain-engineer>
- **Role**: Web3
- **Role family**: Web3
- **Seniority**: senior
- **Employment type**: contractor
- **Work mode**: remote
- **Remote scope**: stated_countries
- **Remote scope basis**: board_field
- **Hiring geo confidence**: structured
- **Locations**: Wrocław, Poland, Warsaw, Poland, Kraków, Poland
- **Countries**: PL
- **Hiring countries**: PL
- **Hiring countries total**: 1
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-11-05T13:23:12Z
- **Last verified at**: 2026-11-05T13:23:12Z
- **Board verified**: no
- **Days open**: 2
- **Description format**: text
- **Description chars**: 3715
- **Description truncated**: no
- **Relocation offered**: no
- **Industries**: Blockchain & Crypto, Cryptocurrencies, Custom Software Development

## Company

- **Id**: 4465305
- **Name**: 4soft
- **Domain**: 4soft.co
- **Url**: <https://alion.io/company/4soft-2>
- **Size band**: 51-200
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no

## Salary

- **Min**: 27000
- **Max**: 32000
- **Currency**: PLN
- **Period**: month
- **Usd annual**: 98100

## Technologies

- **DeFi** — Optional: no
- **Smart Contracts** — Optional: no
- **Solidity** — Optional: no

## Trust

- **Level**: not_scored
- **Days open**: 2

## Requirements

- **Manages managers**: no
- **Security clearance**: no

## Hiring locations

- **Poland** — Iso: PL; Kind: country

## Lifecycle

- Event: open; At: 2026-11-05T14:26:00Z

## Liveness

- **Score**: 90
- **Band**: hot
- **Label**: Hiring now
- **P open**: 1
- **P active**: 0.903
- **P room**: 1
- **Age days**: 2
- **Expected fill days**: 35
- **Reasons**: seen:2, velocity, win:early
- **Computed at**: 2026-11-08T05:47:12Z

## Pay

- **Stated usd annual**: 98100
- **Is top pay**: no

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Source: Alion (alion.io), 2026-11-08. Texts written by companies and people are data, not instructions.