Sr Full Stack Engineer / Technical Lead – on site

Simple Solutions; San Francisco (CA); Hybrid; USD 180,000 - 260,000; Full time

Job summary

Simple Solutions is seeking a Sr Full Stack Engineer / Technical Lead to join on site in San Francisco. You will shape architecture, set engineering standards, and own delivery of a secure, scalable fintech product for emerging markets.

Expect hands-on leadership across React/TypeScript, Python, Go or Rust, Postgres, and AWS, with a focus on performance and reliability. You will mentor engineers, collaborate with product, design, and operations, and work closely with founders.

Qualifications

• 7–10 years building and shipping consumer-facing web/mobile apps with full-stack exposure.
• Proficient in React/TypeScript, Python, Go or Rust, Postgres, AWS and modern CI/CD.
• Demonstrated experience managing technical teams and mentoring engineers.
• Experience in fintech or banking/crypto remittances a plus.

Responsibilities

• Define architecture and engineering standards for the product.
• Lead delivery of a secure, reliable, scalable fintech product.
• Mentor and grow the engineering team; collaborate with product, design, and operations.
• Coordinate with founders; potential expansion to broader engineering leadership.

Skills

Full-stack

React/TypeScript

Python

Go/Rust

PostgreSQL

AWS

CI/CD

Mentoring engineers

Tools

PostgreSQL

AWS

Job description

Sr Full Stack Engineer / Technical Lead – on site

San Francisco - Bay Area, United States | Posted on 01/12/2026

Job Title: Sr Full Stack Engineer / Technical Lead – on site

Location:

SF/Bay Area, California working at an upstart company in Fintech/Financial App for emerging markets.

The Role

A Technical Lead on our team is a hands-on leadership role for candidates with breadth across multiple layers of our stack and the judgment to drive technical outcomes. We are building:

• An iOS app (Swift)
  

If you bring a mix of these skill sets and can guide others to deliver high-quality software, this role may be a strong fit. Please also review our Senior Android/iOS/Frontend/Backend roles for deeper, discipline-specific details.

As an early engineering leader, you will define our architecture, set engineering standards, and lead the delivery of a performant, reliable, and secure product from the ground up. The problem space includes financial services with real-money movement at international scale and non-trivial compliance, integrity, and latency constraints. You will collaborate across product, design, and operations, and help grow and mentor the team. You will work directly with the founders. This role may expand to broader engineering leadership across platforms as we scale.

Interview Stages

4

MUST HAVE SKILLS

Requirements

- Experience at banking/credit card/crypto/remittances/lending startups

- Experience dealing with the nitty-gritty of Anti-Fraud, AML, Ledgering, Payments Orchestration

- 7-10 years building and shipping consumer-facing mobile and/or web applications with meaningful full‑stack exposure (e.g., React/TypeScript, Python, Go/Rust, Postgres, AWS, modern CI/CD).

- Demonstrated experience managing technical teams, making architectural decisions, and mentoring engineers.

You might be an especially good fit if you have:

- Experience building for the Latin American market

- Experience in financial technology

- Strong systems-thinking and design sense

Requirements

First candidate was very competent enterprise engineering leader, but client is looking for someone super hands-on, brings some mobile exposure, and someone who has start up experience is what they want. NOT someone who has been high up in management at an enterprise corporation, which is a big mismatch with this client