Back End Developer

HartleyCo; Berlin; Vor Ort; EUR 78.000 - 110.000; Vollzeit

Zusammenfassung

HartleyCo is seeking a senior backend engineer in Berlin to own core services and drive scalable infrastructure. You will design APIs, shape data models, and improve performance in a production environment with a focus on reliability.

The role involves building asynchronous systems and owning AI infrastructure, data pipelines, and integrations with external platforms. You will collaborate with vendors, design for failure, and implement robust monitoring and observability.

Qualifikationen

• You have built and run backend systems in production.
• You design for failure and eventual consistency with retries, idempotency, reconciliation, and recovery.
• You have integrated with APIs and platforms you don't control.
• You are comfortable working with external vendors and partners.
• You use AI coding agents and ensure production quality.

Aufgaben

• Take ownership of the backend: Design APIs, shape data models, improve query performance, and make architectural decisions.
• Build and maintain asynchronous systems: Work across queues, background processes, scheduled jobs, retries, and failure handling.
• Own the AI infrastructure and pipelines: Support AI workflows, prompt versioning, monitoring costs and latency, and handling model-provider failures.
• Build reliable data pipelines: Move and transform data for reporting and analytics.
• Integrate with customer systems: Connect with POS, scheduling, payroll, and other third-party platforms.
• Design for reliability: Implement idempotency, reconciliation, monitoring, and data discrepancy handling.
• Work directly with technical partners: Sandbox environments, API reviews, and partner integrations.
• Create internal tools: Build tooling for the CS team to investigate integrations.

Kenntnisse

Backend systems

Distributed systems

APIs integration

External vendors

AI coding agents

TypeScript

Node.js

Postgres

Prisma

Kubernetes

Tools

Cloud platforms

Jobbeschreibung

• Take ownership of the backend: Design APIs, shape data models, improve query performance, and make the architectural decisions that become increasingly difficult to change over time.
• Build and maintain asynchronous systems: Work across queues, background processes, scheduled jobs, retries, and failure handling to make sure temporary issues don't turn into prolonged outages.
• Own the AI infrastructure and pipelines: Support existing AI workflows and help build the next generation of features, including prompt versioning, evaluation, monitoring costs and latency, and handling model-provider failures effectively.
• Build reliable data pipelines: Move and transform data for reporting and analytics, giving operators a consistent and accurate view across multiple locations.
• Integrate with customer systems: Connect Bounti with POS, scheduling, payroll, and other third-party platforms. Build reusable integration infrastructure rather than maintaining separate solutions for every partner.
• Design for reliability: Implement idempotency, reconciliation, customer-level monitoring, and mechanisms for identifying discrepancies when external systems provide incorrect or unexpected data.
• Work directly with technical partners: Handle sandbox environments, certification requirements, API reviews, and other technical aspects of partner integrations.
• Create internal tools: Build tooling that helps the CS team investigate integration issues, troubleshoot failed synchronisations, and activate new integrations.

Your profile

• You have built and run backend systems in production and understand the long-term impact of the technical decisions you make.
• You naturally design for failure and eventual consistency. Retries, idempotency, reconciliation, and recovery are fundamental parts of how you approach distributed systems.
• You have integrated with APIs and platforms you don't control, and can talk through real examples of challenges you've encountered.
• You are comfortable working with external vendors and partners, whether that's a POS provider, workforce platform, or AI model provider, and understand that not everything moves at your preferred pace.
• You use AI coding agents while taking responsibility for the final result. We use Claude Code and Cursor every day. Writing code is only part of the job — you need to be able to assess generated code critically and ensure what reaches production is maintainable, consistent, and well designed.
• You are practical about architecture and scope, knowing when it's worth investing in a reusable abstraction and when it's better to keep things simple.
• Experience with our stack is a plus: TypeScript, Node.js, Postgres, Prisma, Kubernetes.

Bonus points if you have:

• Experience running LLM-powered features in production, including evaluation, monitoring, and cost management
• Built observability and monitoring for systems involving third-party dependencies
• Taken an integration through a partner certification or app review process from start to finish
• Experience working in hospitality, retail, workforce management, or similar operational software