Freelance Software Engineer - Backend TypeScript

swan.io; United States; Remote; USD 83,000 - 165,000; Full time

Job summary

Swan is looking for a Freelance Software Engineer to join our Banking Experience team. The Engineering group is the largest at Swan, building payments and customer-facing applications while prioritizing compliance, security, and resilience.

You will design with the product team the bank-by-API, own project work, and tackle performance challenges in a high-load environment. Fluency in English and strong TS/backend skills are essential.

Qualifications

• > At least 5 years as a Software Developer with a strong grasp of back-end systems and proficiency in TypeScript.
• > Backend optimization, observability, SQL queries, and query optimization.
• > CI/CD and automated testing; experience with distributed/microservice architectures.
• > Continuous learning and keeping up with the latest development trends.
• > Fluent in English and enthusiastic about open source and functional programming.

Responsibilities

• Be technically responsible for one or more projects.
• Solve problems in a demanding IT domain with a reactive architecture.
• Design the bank-by-API with the product team.
• Improve system performance under growing load.
• Ensure adherence to architecture rules and automated tests.

Skills

5+ years experience

TypeScript

Backend engineering

DevOps & architecture

English fluency

Tools

NodeJS

GraphQL

PostgreSQL

Kafka

Docker

Kubernetes

AWS

Job description

About

Swan is Europe’s embedded banking specialist. We empower software companies to embed banking features like accounts, cards, and payments directly into their products, under their own brand.Swan processes over €1.5 billion in monthly transactions for more than 150 companies—like Pennylane, Indy, Agicap, Libeo, and Lucca. Founded in 2019, the company has received growth capital from leading investors such as Lakestar, Accel, Creandum, Bpifrance and Eight Roads. Swan is a principal member of Mastercard and a licensed financial institution, regulated by the French banking authority (ACPR).

Our mission

Banking belongs in business software

Many software companies already serve small businesses incredibly well: helping them send invoices, run payroll, manage inventory, and more. They’re on a mission to become the central hub for managing every aspect of business life.

But when it comes to financial workflows, there’s still a gap. Too many critical tasks like managing cash flow, tracking payments, or reconciling accounts happen outside the software, across spreadsheets, email threads, banking portals.

It’s a missed opportunity. Business software shouldn’t just record financial activity - it should run it.

To learn more about us: About Swan ; Our story .

Job description

Swan is looking for a Freelance Software Engineer to join our Banking Experience team.

The Engineering team is by far the largest at Swan (70+ people). This team includes Software developers, who build payments and end-customer applications, as well as Infrastructure, DevOps, QA, and Security.

We build with intent, focusing on solving real problems that matter. In a regulated environment, compliance, security, and resilience are at our core. We value ownership, open collaboration, and a shared vocabulary to keep complexity manageable. Simplicity is key, clean, maintainable code wins over clever tricks. We ship fast, learn continuously, and always strive for excellence.

Your mission

• You will be technically responsible for one or more projects.

• You will have the opportunity to solve problems in one of the most demanding IT domains with a reactive architecture.

• You will design with the product team the bank by API.

• You will improve the performance of a system with a rapidly growing load.

• You will ensure the respect of the architecture rules and of the automated tests

Our technical environment

• NodeJS ;TypeScript ;GraphQL ;PostgreSQL ;Kafka ;Docker ;K8S ;AWS
  

Preferred experience

You're a great match if:

• Experience: at least 5 years as a Software Developer with a strong grasp of back-end systems and proficiency in TypeScript.

• Backend Engineering: good mastery of common back-end optimization topics (performance improvements, observability, SQL database queries, and query optimizations).

• DevOps & Architecture: hands‑on experience with automated testing, CI/CD, and exposure to distributed systems or micro-service architectures.

• Continuous Learning: you regularly follow technological improvements to keep abreast of the latest developments (newsletters, conferences, meetups).

• Mindset: fluent in English, passionate about functional programming or open source, and you leave your ego at the door.

Bonus points / If you are ready to bring Senior ownership:

• Product & Project Leadership: you have a proven track record of driving impactful projects from A to Z alongside Product teams, and you have the communication skills to confidently argue and advocate for your technical choices.

• Architecture & Scale: you are used to dealing with high‑complexity systems, naturally designing code with long‑term scalability, clean architecture, and maintainability in mind.

It's okay if you don’t tick all the boxes — don’t let imposter syndrome prevent you from applying!

Swan is committed to providing a caring work environment for all employees, regardless of age, sex, disability, sexual orientation, race, religion, or belief.

We're interested in your work experience, skills, and overall personality. Because diversity makes the workplace stronger and is necessary for Swan’s success, we are intensifying efforts to incorporate concrete actions to help us improve in this area.

About Swan

Our values:

Swan’s core values guide our actions daily. Individually, they may seem obvious, but together, they form a unique culture.

Simplicity: Leonardo Da Vinci said: "simplicity is the ultimate sophistication." If something's convoluted or confusing, we work extra hard to break it down. - Making complex things simple is what we do.

Long Term: We always play the long game, whether it's to support our partners in their growth journey, or make tangible commitments to climate action.

Excellence: We are a team of experts who consistently go all out to create pixel‑perfect banking services and exceed our partners' expectations - whatever it takes.

Be Human: We believe in the power of kindness and the importance of acting with integrity. But embracing our humanity extends beyond interpersonal interactions, it means caring about greater issues that affect our planet.

You can find out more about our culture .

Recruitment process

• 30-min video call with our Talent Acquisition Manager, to get to know you, understand your career expectations and answer your questions

• Live coding interview with two Software Engineers

• Hiring manager interview with an Engineering Manager

• Interview with our VP Engineer