Summary: Seeking a Senior Backend Developer with expertise in Python and FastAPI to design, build, and iterate backend systems for a rapidly scaling fintech company. Highlights: 1. Design and evolve REST APIs with Python and FastAPI 2. Contribute to architectural decisions with a pragmatic mindset 3. Build backend services that manage identity data and onboarding flows ##### **Disclaimer – Must read:** **Commitment \& FocusThis role requires full\-time dedication, with clear priority given to Darwoft projects during the established working hours.It is not compatible with other full\-time professional engagements.Any additional professional activities must be disclosed in advance and must not interfere with the responsibilities or working hours of this role.\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_** **Backend Developer (Python/FastAPI/PostgreSQL) · Senior · LATAM** ------------------------------------------------------------------ **Location:** Anywhere in LATAM **Job Type:** Remote **Project:** Fintech · Cross\-border payments **Time Zone:** Flexible within LATAM **English Level:** B2 / C1 ### **Get to Know Us — Darwoft** At Darwoft, we build digital products with heart. Were a Latin American tech company partnering with fast\-growing companies around the world to create impactful, human\-centered software. Our remote\-first culture is built on trust, ownership, and continuous learning. We value people who adapt quickly, take responsibility for their work, and feel comfortable navigating evolving contexts. Change is part of how we grow — and we support our teams as they grow with it. If youre looking for a place where your technical decisions matter and your contribution has real impact, welcome to Darwoft. ### **About the Role** Were partnering with a rapidly scaling fintech focused on **cross\-border payments and remittances**, enabling users across Latin America to operate directly through WhatsApp. The product is growing fast and entering a new stage, with a strong focus on **identity, onboarding, and account management** at scale. Were looking for a **Senior Backend Developer** with deep hands\-on experience in **Python and FastAPI**, someone highly execution\-oriented who enjoys solving concrete problems, making technical decisions, and owning backend services end to end. This is a very practical role: youll be designing, building, iterating, and improving backend systems that handle sensitive data, high volumes, and real\-world complexity. ### **What Youll Be Doing** * Design, implement, and evolve REST APIs using **Python and FastAPI**, with a strong focus on clarity, performance, and security. * Build backend services that manage identity data such as users, emails, phone numbers, beneficiaries, and onboarding flows. * Design and work hands\-on with **PostgreSQL**, ensuring solid schemas, data integrity, and efficient queries. * Integrate with third\-party services related to authentication, identity verification, and communications (email/SMS). * Collaborate closely with frontend engineers to define API contracts and data models. * Contribute to architectural decisions with a pragmatic, problem\-solving mindset. * Deploy and operate services on **GCP**, using tools like Cloud Run, CloudSQL, IAM/Service Accounts, Secret Manager, and Pub/Sub. * Implement logging, monitoring, and auditing to ensure traceability and reliability. * Apply best practices for handling **PII and sensitive financial data**. ### **What You Bring** * Strong, hands\-on experience building production systems with **Python and FastAPI**. * Solid background designing and working with **PostgreSQL** (schema design, migrations, performance). * Experience building APIs that handle sensitive data in secure, scalable environments. * Practical experience with **Google Cloud Platform** (Cloud Run, CloudSQL, IAM, Secret Manager, Pub/Sub). * Good understanding of authentication and authorization mechanisms (JWT, OAuth2, OpenID Connect). * Experience working with Docker, CI/CD pipelines, and modern deployment workflows. * Comfortable working autonomously, taking ownership, and driving solutions forward. * Clear communication skills in English within a fully remote setup. ### **Nice to Have** * Experience with **React.js** from a backend integration perspective (API design, data contracts). * Exposure to **NestJS** or Node.js\-based backends. * Experience in fintech, payments, remittances, or high\-volume transactional systems. * Familiarity with event\-driven architectures and messaging systems. * Experience with Terraform or other Infrastructure as Code tools. ### **What Darwoft Offers — Contractor** * Contractor agreement with payment in USD * 100% remote work * Argentinas public holidays * English classes * Referral program * Access to learning platforms **Explore this and other opportunities at:** **www.darwoft.com/careers**