# Reins - Fullstack Engineer at deCircle

> Remote · United States · Unspecified · Full-stack · open. Source: https://alderhq.app/jobs/recruitee%3Adecircletalentpartner%3A2460970 (read 2026-11-08).

## Facts (observed)

- Company: [deCircle](https://alderhq.app/companies/decircle)
- Location text: San Francisco, California, United States
- Where it can be done from (inferred): Remote · United States (evidence: "Remote role open worldwide")
- Posted: 2026-02-05 (276 days ago)
- First seen by alder: 2026-11-04 · last verified: 2026-11-04
- Reposted: 0 times · edited: 0 times
- Apply on the employer's site: https://talent.makerdao.network/o/reins-fullstack-engineer
- Skills listed (inferred): Ruby/Rails, Flutter

## Pay and sponsorship

- Posted pay: not posted
- Market band for similar posted roles (SF Bay Area, n 112): p25 $168k, median $200k, p75 $254k

## Description (the employer's text)

Reins is building an enterprise stablecoin account that looks and feels like a first-class business bank account, while giving companies the benefits of stablecoin rails and self-custody. Reins makes stablecoins operationally simple for businesses, providing familiar banking features such as ACH, wires (and global equivalents like SEPA), cards, multi-level permissions, approvals, and AML/compliance workflows—combined with stablecoin-native advantages like instant 24/7 global settlement, better control via self-custody, and access to lending, insurance, and exchange markets as DeFi infrastructure matures.

### Role Overview

You’ll work directly with founder and CEO Sebastian Delgado (co-founder of Fei Labs), taking ownership of meaningful chunks of backend, full-stack, and security work. The role is flexible:

Full-stack engineer (preferred)

### Backend engineer

Product/frontend contributor (optional)

Focus areas are prioritized as follows: security & smart contracts, full-stack, backend, and product/frontend. Infrastructure/devops is not a current priority.

### Backend & Integrations

Design and build backend services connecting custody, fiat rails, policies, and operational workflows

Implement and maintain APIs and services for ACH, wires, cards, permissions, AML/compliance workflows, and reporting

### Smart Contracts & Security

Implement and review Solidity smart contracts, focusing on correctness, safety, and upgradeability

Contribute to threat modeling, security reviews, and audit/vendor management

### Product & Full-Stack Work

Collaborate on the design and implementation of customer-facing applications (currently Dart/Flutter)

Translate user and operational needs into product and UX decisions, especially around permissions, approvals, and money flows

### Security & Audit Participation

Own parts of audit/security review processes for your areas of the stack

Coordinate with external security firms

Build internal systems and processes with a security-first mindset appropriate for handling customer funds

### Requirements

Strong background as a backend or full-stack engineer, ideally in early-stage fintech (Plaid, Brex, Ramp, modern neobanks)

Experience with crypto infrastructure, wallets, or stablecoin projects

Proficiency in Solidity smart contracts or a willingness to contribute to security-critical logic

Familiarity with APIs, integrations, and operational workflows (ACH, wires, cards, permissions, AML/compliance)

Ability to collaborate on frontend/product work is a plus (Dart/Flutter experience beneficial)

Strong understanding of security best practices for handling customer funds

Excellent problem-solving, attention to detail, and autonomy in early-stage environments

### Preferred Backgrounds

Early engineers at crypto infra/wallet/stablecoin companies

Strong backend/full-stack engineers from top fintechs who are crypto-native

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Data: alder (https://alderhq.app). Cite https://alderhq.app/jobs/recruitee%3Adecircletalentpartner%3A2460970 and the date you read it. Observed facts come from the employer's own listing; location reach, level, family and skills are inferences.