Senior Backend Engineer, Customer Data Platform

Piano

Senior Backend Engineer owning Piano’s customer data platform services in Warsaw. Operating Node.js/TypeScript pipelines, Elasticsearch, Kafka, Kubernetes, and AI-first development workflows.

Posted 8/17/2026full-timeWarsaw • 🇵🇱 PolandSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in Node.js and TypeScript development, with a strong focus on Elasticsearch and Kafka for high-performance data handling. Proven ability to manage production environments, coordinate cross-team integrations, and communicate effectively with technical and business stakeholders.

Highest-signal resume keywords

Node.js DevelopmentTypeScript ProficiencyElasticsearch 8.x ExpertiseKafka-at-Scale ExperienceProduction Ownership

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Claude Code PracticePostgreSQL with ORMKubernetes ManagementGitOps with HelmDatadog InstrumentationDependency and CVE TriageBackpressure ManagementTransaction SemanticsReindexingConsumer Concurrency

Soft Skills

Clear Technical EnglishCross-Team CollaborationStakeholder Communication

Tools & Technologies

HelmGitLab CIFluxCDJestMocha

Industry Keywords

Event-Pipeline ServicesLoad SheddingDead LetteringHigh-Volume Multi-Tenant Data PlatformsToggle-Gated Rollouts

Tech Stack

Tools & technologies

ElasticSearchGRPCJavaJavaScriptJestKafkaKubernetesMochaNode.jsPostgresRedisTypeScript

About the role

Key responsibilities & impact

Deliver through Claude Code and improve context, agent tooling, and evaluation of agent output
Own event-pipeline services under load spikes and pathological traffic, including backpressure, load shedding, circuit breakers, retries, and dead lettering
Own the Elasticsearch query and search layer, including deep pagination and behavior under memory and rate limits
Own sandboxed execution of customer logic and integrations with Piano products and third-party systems
Drive integration work across team boundaries and coordinate cross-service rollouts
Scope epics and technical trade-offs with technical, product, and business counterparts
Create decision records for other teams to build against
Review teammates’ work with depth scaled to risk and test determinism
Run production changes end to end through Helm and FluxCD GitOps
Participate in on-duty rotation covering alerts, P1/P2 triage, hotfixes, and root-cause communication to enterprise customers

Requirements

What you’ll need

Daily, fluent Claude Code practice on production code
Strong Node.js and TypeScript, including ESM, strict tsconfig, and Jest/Mocha
Deep Elasticsearch 8.x knowledge, including mappings, reindexing, sort and range semantics, deep pagination, and backpressure
Kafka-at-scale experience, including partitioning, consumer concurrency and lag, dead-letter handling, and topic lifecycle
Production ownership experience with on-call, evidence-backed root cause analysis, Datadog instrumentation, toggle-gated rollouts, and profiling-driven performance work
PostgreSQL experience with an ORM, including migrations, indexing, and transaction semantics
Willingness to own Kubernetes, Helm, GitOps, and GitLab CI
Experience with dependency and CVE triage
Clear technical English
Ability to hold a technical position with product and business stakeholders
Nice-to-have: MCP servers, agent skills, V8 isolates, ClickHouse, Aerospike, ArangoDB, Redis, gRPC, Testcontainers, WireMock, Rush, pnpm workspaces, high-volume multi-tenant data platforms, and maintenance-level Java

Benefits

Comp & perks

Flexible working hours
Competitive compensation and benefits
Laptop of your choice
Generous token usage budgets
Freedom to choose your tools
Real ownership of systems from design through production