Senior Backend Engineer, AI Product

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Gismart

WebsiteLinkedInAll Job Openings

201 - 500 employees

👥 B2C

🧘 Wellness

📱 Media

B2C • Wellness • Media

Gismart is a mobile app developer that creates award-winning consumer apps across health, wellness, utilities, and music. The company reports more than 1 billion downloads worldwide and 30+ million monthly active users, and states a mission to make personal wellness more accessible through easy-to-use interactive technology. Gismart focuses on B2C mobile experiences that encourage healthy habits and provide music and utility apps for a broad consumer audience.

📋 Description

• Build the orchestration core as a unified layer over multiple AI providers • Implement failover, retries, rate limiting, and rapid onboarding of new AI models • Own stable, versioned API contracts consumed by the Flutter client • Build a media pipeline for storing and delivering generated assets through S3/CDN with cost control • Maintain reliability during paid-traffic spikes through metrics, tracing, and per-provider alerting • Implement usage accounting, per-generation cost tracking, billing integration, and idempotent charging • Design asynchronous generation pipelines with long-running job queues, provider webhooks, delivery guarantees, and failure recovery • Shape the product’s technical foundation, make architectural decisions, and own backend development end-to-end • Drive solutions as the first Product Engineer across the full development lifecycle

🎯 Requirements

• 4+ years of commercial backend development experience • Strong experience with Go, or solid backend expertise in Java, Kotlin, C#, Rust, or TypeScript with willingness to transition to Go from day one • Experience designing and building backend services under real production load • Understanding of architectural trade-offs and decision-making • Strong REST and gRPC API design skills • Focus on maintainability, backward compatibility, and APIs consumed by mobile applications • Experience integrating third-party APIs, including retries, idempotency, rate limiting, and graceful recovery from partial failures • Strong PostgreSQL knowledge, including transactions, isolation levels, indexing, and data consistency • Experience with asynchronous processing and messaging systems such as SQS, Redis, Kafka, or Temporal • Experience with AWS or GCP, Docker, and modern CI/CD pipelines • Practical observability experience with metrics, logging, tracing, and independently debugging production issues • Ability to ramp up on an existing codebase and build on it rather than rewrite it • Comfortable working in a fast-paced, iterative pre-PMF environment • Ready to take ownership as the first Product Engineer • Experience with VictoriaMetrics, Grafana, and Sentry is a plus • Production experience with generative models, billing systems, media pipelines, B2C products, streaming protocols, Kubernetes, Kafka, early-stage startups, or shipped personal projects are nice to have

🏖️ Benefits

• Flexible working schedule • Work anywhere in the world, either remotely or in one of the corporate hubs • 100% compensation for coworking spaces in Ukraine, except Kyiv • 50% compensation for coworking spaces worldwide • Free office lunches for employees working from hubs • 6 fixed public holidays per year plus 5 flexible additional holidays • 100% sick leave compensation • Partial coverage of medical insurance, sports activities, and therapy costs • Equipment provision or maintenance cost coverage for personal tools • 70% coverage of professional development courses • 100% coverage of corporate English courses • 18 working days of paid vacation and 3 personal days per year • An extra vacation day for each year at Gismart • Corporate events and team-building activities across Gismart hubs