Company: Fraud Deflect Role: Senior Software Engineer Language: Native/fluent English. Resumes in English. About the role Own and evolve critical payments/back-office services end-to-end: design, build, ship, and operate API-first Python systems that automate disputes/chargebacks and related workflows. You’ll partner directly with clients and internal teams to translate business rules into reliable integrations, services, and data models— leveraging Linux, with a pragmatic DevOps mindset. Responsibilities Lead project execution: technical design, implementation plans, code reviews, and delivery coordination. Build and operate REST APIs in Python (versioning, idempotency, auth, webhooks, integrations). Own API integrations with external partners/processors: onboarding, validation, retries, error handling, and SLAs. Implement complex payments/chargeback business logic from requirements and client workflows; ensure correctness and auditability. Model API/domain data with strong data-structure fundamentals (schemas, invariants, normalization/denormalization tradeoffs). Develop and maintain client-facing device intelligence instrumentation in JavaScript where needed (collection, privacy controls, performance). Meet and maintain contact directly with clients. Operate services on Linux: deployments, debugging, performance tuning, incident response, and reliability improvements. Contribute to DevOps practices: CI/CD pipelines, safe rollouts, observability (logs/metrics/traces), and operational automation. Required Expert Python backend engineer (3.12+ preferred): strong typing, testing, concurrency fundamentals, and performance debugging. Proven REST API development experience (design + production operations), including integrations and webhooks. Strong data structures and API data modeling skills (clear contracts, backward compatibility, validations). Experience implementing business logic for payments/fintech workflows, especially disputes/chargebacks and reconciliations. Comfortable on Linux servers with a DevOps mindset (deploy/run/debug production services; automate operational work). Client-facing technical communication: can interface with external stakeholders to clarify requirements, diagnose issues, and drive resolutions. Ownership mentality and interest in leadership: drive the full lifecycle from discovery → design → build → operate. Nice to have JavaScript experience beyond basics (instrumentation, performance, privacy-aware collection) for client integrations. Containerization/orchestration (Docker/Kubernetes), IaC (Terraform), and cloud-native operations on Amazon Web Services. Event-driven/workflow systems (SQS/Kafka/Kinesis; Airflow/Prefect/Dagster). Security/compliance exposure (PCI, SOC 2) and observability tooling at scale. How to apply Send an English resume and links to relevant work (repos, API docs, architectural notes, or write-ups) showing: Python backend API development + real-world API integrations Payments/disputes/chargebacks or similarly complex workflow automation Linux/DevOps experience running production services Any JavaScript instrumentation work and client-facing delivery experience