Job Url: https://www.linkedin.com/jobs/search/?currentJobId=4330502927&f_AL=true&f_TPR=r86400&f_WT=2&keywords=software%20engineer&origin=JOB_SEARCH_PAGE_JOB_FILTER&start=50 Job Description: Backend Developer Robyn 🪺 · San Francisco Bay Area (Remote) Easy Apply Save Save Backend Developer at Robyn 🪺 Show more options Your profile is missing required qualifications Show match details Help me update my profile BETA Is this information helpful? Get personalized tips to stand out to hirers Find jobs where you’re a top applicant and tailor your resume with the help of AI. Try Premium for PKR0 About the job About Robyn We're building the world’s first emotionally intelligent AI that powers connection. We're building a deeply human company that will make billions of people come alive. You’ll be building the backend infrastructure that powers all of it: Conversations, memory, and real-time personalization Scalable infra for emotional intelligence Secure and fast APIs for our iOS app You’ll be the technical backbone of Robyn — designing and shipping fast, scalable, emotionally aware systems while collaborating closely with iOS, product, and AI teams. Responsibilities 1. Backend & Infra Ownership You'll work and add to our C# / .NET / ASP.NET backend api layer (have experience in this or something similar like Java/Spring and can learn quickly) and progressively add many Python microservices (FastAPI or AWS Lambda) with modular, AI-native architecture in mind to build our intelligence layer. Deploy models and setup some ml training pipelines. Understand dependency injection, Strategy Pattern, inversion of control, and other best practices for code maintainability Own the full backend surface area — auth, APIs, infra, orchestration — and design all of your features for scale and velocity. Build and maintain REST and GraphQL APIs consumed by our iOS client; low-latency, resilient, and well-instrumented. Architect a microservice-style ML model serving backend deployed via Docker containers or AWS Lambda (SnapStart), backed by async eventing and pub/sub where needed. Own CI/CD, rollback strategies, logging, error handling — the backend is your domain, end-to-end. 2. AI & ML Systems Integration Architect and manage existing vector DB (PgVector) and potentially add more to power retrieval-augmented generation, evolving memory, and personalization. Build tools and add to our custom memory pipelines tied to user context, embeddings, and interaction history. Integrate and scale inference with OpenAI, Claude, Llama, or other models. Build wrappers, manage caching, fallbacks, and prompt routing logic. Own emotion and sentiment tagging workflows; plug in APIs or run lightweight classifiers in-line. Maintain API orchestration layer with 3rd party model providers (OpenAI, ElevenLabs, etc.). 3. Cloud Infra, DevOps, and Data Stack Manage our AWS infrastructure and add to our current stack with new innovate technologies: Lambda, ECS, S3, RDS (Postgres), CloudFront, IAM, Route53 — you’ll be the one making the call on architecture and trade-offs. Be able to use search databases like OpenSearch Infra-as-code with Terraform. Pipelines through GitHub Actions. Full observability: metrics, structured logging, tracing, alerting — Open Telemetry, Sentry, Grafana, Cloudwatch, etc. Optimize latency across API surface, tune Postgres indexes, add Redis caching layers to many of your services and pub/sub or streaming for near-instantaneous data sync. Set up and secure infra for SOC-2 readiness: access controls, data lifecycle policies, encrypted storage. 4. Personalization & Emotional Intelligence Layer Design and ship emotion-aware backend systems that update in real time based on user behavior. Implement custom memory engines — user embeddings, experience graphs, emotional scores — and build APIs that adapt over time. Work with product and AI to tune behavior of Robyn based on user feedback, emotion logs, memory history, and interaction loops. All personalization logic 4. Frontend Support You can spin up a React webapp and maintain the webapp You’ll Own This Stack Core Backend Languages: C# / .NET / ASP.NET (CRUD database and application layer), Python (ML Intelligence Microservices) Protocols: REST, WebSockets, SignalR, SSE, GraphQL Datastores: PostgreSQL, Redis/ValKey (cache + pub/sub), Graph Databases Neo4j/Neptune (Graph Rag), S3 Datalake CDC: Debezium and Kinesis streaming Product Analytics: Posthog Infra + DevOps Auth: AWS Cognito Cloud: AWS (RDS Aurora, ECS, Lambda, S3, Route 53, CloudFront, IAM, SQS, SNS, SES, etc) IaC: Terraform Containers: Docker, Kubernetes (EKS) CI/CD: GitHub Actions Monitoring: Sentry for APM, Grafana/Datadog/NewRelic/CloudWatch AI/ML Layer LLMs: OpenAI, Claude, Llama, Gemini, etc. Libraries: HuggingFace, PyTorch/TensorFlow/Keras/H2O (for lightweight classifiers/fine-tuning) RAG / Memory: PgVector, Redis Vector, FAISS, Pinecone Voice Stack: AWS Transcribe (STT), ElevenLabs (TTS) Emotion/Personality Engine: custom classifiers, prompt chains, and embedding-based user profiles You’re NOT the right if if you: Want a 9 -5 Used to others owning pieces of the backend Copy-paste vibe code The ONLY right fit: You have a track record of owning the backend end-to-end and taking the codebase personally. You ship with rigor and velocity You are proud to put your name on the codebase Why Join Robyn Build the most emotionally intelligent AI product on Earth — at a moment of hypergrowth. Work directly with a visionary founder (Harvard-trained surgeon turned CEO). Backed by elite investors (Google Maps co-founder, x.ai founder, and more). Early team = massive ownership, creative control, and impact. Remote-first, async-friendly culture with deep focus and emotional clarity. ***TO APPLY*** Complete the typeform application -- applicants MUST complete the typeform to be considered