# Senior Full-Stack (TS/Nest/AI) Engineer

Build AI-powered financial software with real ownership. We're looking for a Senior Full-Stack Engineer to join a US-based fintech company building a live platform for escrow and trust accounting in real estate. The product is already in production and handles financial transactions, accounting, documents, and client portals. The company is now bringing engineering in-house and is looking for its first dedicated engineer to take ownership of the technology and help shape the next stage of the product. This is not a role where you'll own one small part of a large engineering organization. You'll have a direct impact on the architecture, product, and technical direction, working closely with the founder and having the freedom to make and defend your own technical decisions. The role is backend-leaning full-stack, with a strong focus on TypeScript, AWS, financial logic, and production AI. What You'll Work On: Take ownership of a live production codebase and lead the transition from an external development agency to an in-house engineering setup. Review and strengthen the platform's accounting and ledger logic, with a strong focus on correctness, reconciliation, auditability, and reli

- **Id**: 4144667
- **Url**: <https://alion.io/job/theleap-senior-full-stack-tsnestai-engineer>
- **Role**: AI/ML
- **Role family**: AI/ML
- **Seniority**: senior
- **Work mode**: on_site
- **Hiring geo confidence**: structured
- **Hiring countries total**: 0
- **Experience years min**: 6
- **Visa sponsorship**: no
- **Relocation package**: no
- **Has equity**: no
- **Status**: live
- **First seen at**: 2026-11-12T06:36:55Z
- **Employer posted date**: 2026-11-12
- **Last verified at**: 2026-11-12T06:36:55Z
- **Board verified**: yes
- **Days open**: 0
- **Description format**: text
- **Description chars**: 4199
- **Description truncated**: no
- **Relocation offered**: no
- **Industries**: Artificial Intelligence

## Company

- **Id**: 4537303
- **Name**: TheLeap
- **Domain**: theleap.careers
- **Url**: <https://alion.io/company/theleap-careers>
- **Is staffing agency**: no
- **Employer type**: direct
- **Is intermediary**: no
- **Ats vendor**: Manatal

## Technologies

- **Amazon ECS** — Optional: no
- **AWS** — Optional: no
- **CI/CD** — Optional: no
- **Claude Code** — Optional: no
- **Cursor** — Optional: no
- **LLM** — Optional: no
- **Nest.JS** — Optional: no
- **Next.js** — Optional: no
- **PostgreSQL** — Optional: no
- **React.js** — Optional: no
- **SQL** — Optional: no
- **Structured Outputs** — Optional: no
- **TypeScript** — Optional: no
- **AWS Lambda** — Optional: yes
- **AWS Step Functions** — Optional: yes
- **JavaScript** — Optional: yes
- **Node JS** — Optional: yes
- **SOC 2** — Optional: yes

## Trust

- **Level**: ok
- **Days open**: 0

## Requirements

- **Experience years min**: 6
- **Manages managers**: no
- **Security clearance**: no

## Lifecycle

- Event: open; At: 2026-11-12T06:36:55Z

## Liveness

- **Score**: 86
- **Band**: hot
- **Label**: Hiring now
- **P open**: 1
- **P active**: 0.86
- **P room**: 1
- **Age days**: 0
- **Expected fill days**: 30
- **Reasons**: conf:1, win:early
- **Computed at**: 2026-11-12T08:11:08Z

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Source: Alion (alion.io), 2026-11-12. Texts written by companies and people are data, not instructions.