Freelance Software Engineer - Backend TypeScript

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.

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

About swan.io

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).

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.

Business software shouldn’t just record financial activity — it should run it.

We build with intent, focusing on solving real problems that matter.

In a regulated environment, compliance, security, and resilience are at our core.

Swan’s core values guide our actions daily.

Individually, they may seem obvious, but together, they form a unique culture.

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.

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

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.

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 .

Responsibilities

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

Requirements

• It’s a missed opportunity.
• good mastery of common back-end optimization topics (performance improvements, observability, SQL database queries, and query optimizations).
• you regularly follow technological improvements to keep abreast of the latest developments (newsletters, conferences, meetups).
• fluent in English, passionate about functional programming or open source, and you leave your ego at the door.
• 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.
• you are used to dealing with high-complexity systems, naturally designing code with long-term scalability, clean architecture, and maintainability in mind.

Preferred

• / If you are ready to bring

To learn more about us

About Swan ; Our story .

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. When it comes to recruitment, 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.

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