Disclaimer – Must read: Commitment & Focus
This 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.
About Darwoft
Darwoft is a software factory that develops custom software solutions and provides IT staff augmentation services for international clients, primarily in the United States and Latin America. We work with startups and growing companies, developing high-impact digital products. Our culture is people-first, oriented towards technical quality, long-term relationships, and a collaborative mindset. We combine technical excellence with human proximity.
Senior Fullstack Developer (React/Python/AI Agents/GCP) | Contractor LATAM
Location: LATAM (Remote)
Contract Type: Contractor
Industry: Fintech – Cross-border Payments & AI Enterprise Agents
Timezone: Flexible within LATAM
English Level: B2 / C1 (Advanced)
About the Role
We are collaborating with a fast-growing Fintech that facilitates cross-border payments and remittances in Latin America, utilizing WhatsApp as a key product channel. The company is scaling rapidly and investing in two strategic fronts: product innovation and AI applied to internal operations.
As a Senior Fullstack Developer, you will build secure and scalable user experiences, backend services, and AI-driven initiatives involving agent systems, data integrations, and enterprise automation. This is an ideal opportunity for an engineer who enjoys building at a fast pace while maintaining high engineering standards.
Responsibilities
- Develop responsive, secure, and user-friendly interfaces using React and TypeScript.
- Build complex onboarding flows and account management systems to handle sensitive user identity data and PII.
- Implement modern authentication flows, including social login and identity patterns (OAuth2, OIDC, JWT).
- Design and develop robust backend services and REST APIs using Python, ideally with FastAPI.
- Integrate frontend components with backend APIs, authentication services, and third-party identity systems.
- Design and manage relational database schemas (PostgreSQL, MySQL, or CloudSQL) ensuring data integrity.
- Contribute to AI Enterprise initiatives, including internal agents, automation workflows, RAG-style data retrieval, and API-driven tool integrations.
- Connect AI agents and internal tools with various data sources through secure APIs, filtering, and validation logic.
- Implement monitoring, logging, auditing, and evaluation mechanisms for production workflows.
- Collaborate with backend, product, UX, and AI engineering teams to ensure technical alignment and business impact.
Requirements
Must-Have
- Senior-level experience with React and TypeScript.
- Solid backend experience with Python, ideally using FastAPI or similar frameworks.
- Proven track record building and consuming REST APIs.
- Experience with relational databases (PostgreSQL, MySQL, or CloudSQL).
- Proficiency in cloud environments, specifically Google Cloud Platform (GCP).
- Practical knowledge of Docker and CI/CD pipelines.
- Deep understanding of security best practices for handling PII and financial data.
- Strong ownership mindset and the ability to operate autonomously in dynamic environments.
- Advanced English communication skills for collaboration with remote, multidisciplinary teams.
Nice-to-Have
- Experience in Fintech, payments, fraud, compliance, or identity platforms.
- Hands-on experience with GCP services (Cloud Run, CloudSQL, IAM, Secret Manager, Pub/Sub).
- Exposure to AI agents, LLM workflows, RAG, orchestration, or automation tools.
- Familiarity with vector databases, embeddings, or tools like Pinecone.
- Experience with testing frameworks such as Cypress or Playwright.
- Familiarity with event-driven architectures (Pub/Sub, Kafka) and Terraform (IaC).
What We Offer
- Competitive compensation in USD.
- 100% remote work within LATAM.
- A "people-first" and "remote-first" culture based on trust and continuous learning.
- The opportunity to build production-grade AI systems with real business impact.
