Join the globally distributed Elasticsearch Search Relevance team to lead design and implementation of search features and relevance improvements (including contributions to Lucene and vector search). The role requires strong Java skills, experience with search/vector databases and algorithms (HNSW, IVF), working in distributed teams, open source collaboration, and improving search performance and reliability. Listed salary range: 791,300–1,251,700 NOK per year.

Join the globally distributed Elasticsearch Search Relevance team to lead development of search features, improve Lucene, and work on vector search capabilities. Responsibilities include designing and implementing algorithms and data structures, fixing complex bugs, collaborating across a distributed team, and writing idiomatic modern Java. Required experience includes search or vector databases and familiarity with algorithms such as HNSW or IVF; experience with data storage technologies (Elasticsearch, Solr, PostgreSQL, MongoDB, Cassandra) and using AI tools to aid development is highlighted.

Work as a senior engineer on Elasticsearch's Search Relevance team to design and implement search features and algorithms (including vector search and work with HNSW/IVF), contribute to Lucene, fix bugs, and collaborate with a distributed, open-source-focused team. Role emphasizes modern Java development, system-level and algorithmic work, and collaboration across distributed teams. Compensation includes a listed CAD annual salary range, benefits, and participation in stock program.

Senior staff engineering role on the Growth Engineering team building and maintaining full-stack systems (GraphQL APIs, Python backend, React/React Native frontends) that power eligibility processing, identity/access, and client configuration. Requires ownership of large cross-team projects, technical spec/RFC writing, mentoring, on-call participation, and maintaining security and compliance (HIPAA/GDPR).

Kraken seeks an Engineering Manager to grow and lead a team of 8–10 engineers responsible for core trading backend services (matching engine, market data gateways, order entry). The role requires technical engagement in low-latency, high-concurrency, and high-volume transaction systems on Linux, proficiency in Rust and/or C++, familiarity with messaging (Aeron) and multicast market data, and experience with trading systems and order types. The team works across C++, Rust, Go, and Python and is distributed across multiple countries listed in the posting.

Join GitLab’s Plan: Spec-Driven Development team to design and implement backend flows, APIs, data models, and evaluation systems for agentic workflows that turn intent into implementation. Work primarily with Ruby on Rails and Python, PostgreSQL, GraphQL/REST, LLM APIs and the GitLab Duo Agent Platform; lead features end-to-end, mentor engineers, and collaborate in an async remote environment. Poland base salary range: 272,000–408,000 PLN/year.

Join the Gitaly team to design and implement Git data storage and repository-serving systems used by GitLab.com and self-managed customers. Responsibilities include leading technical design for distributed storage and scalability, owning complex projects end-to-end, operating production systems (including on-call and incident response), and mentoring peers. Strong experience with Go or another backend/systems language, distributed/high-availability systems, performance and observability is expected; experience with Ruby, Git internals, or gRPC is desirable.

Work on backend systems and microservices powering ClassPass (Playlist). Partner with Product, Design, and QA to design, build, and operate reliable, scalable backend services and APIs. Requirements include 8+ years building large-scale SaaS backend systems, strong OOP skills (Java, Kotlin, C#, etc.), SQL/relational database expertise, familiarity with monitoring tools (New Relic, Kibana), and engineering best practices such as automated testing and code reviews. Base salary range in the United States is $151,000 to $200,000.

Work on backend architecture and APIs powering capture, editing, and publishing of video and image content. Collaborate cross-functionally to design, implement, test, and launch scalable media processing pipelines and services; mentor junior engineers and contribute to developer workflows.

Role owns voice channel end-to-end (telephony/CPaaS, streaming speech-to-text/text-to-speech, realtime model orchestration) and builds full-stack product features across React/TypeScript front ends, Scala and Python services, and cloud infrastructure (GCP/AWS). Requires ~6+ years experience, realtime/voice systems familiarity, backend and frontend depth, and operational responsibilities (observability, SLAs, on-call).

Lead backend engineering work on APIs, services, event-driven workflows, queues, background jobs, and data performance. Requires deep production Node and TypeScript experience, strong SQL and database judgment, systems thinking connecting application architecture with platform/infrastructure/data/security, and experience improving reliability, observability, and performance at scale. Remote role hiring permanent US residents only.

Netguru is hiring a remote Staff Node.js Developer - Architecture (freelance, full-time) to provide deep system design and architecture judgment across multi-product systems. The role involves code and design assessments, writing/reviewing RFCs/ADRs, designing incremental migration paths, and addressing constraints including PCI DSS, multi-currency payments and high traffic spikes; start in September 2026, duration until 31.12.2026, rate up to 42 EUR/h (B2B).

Responsible for end-to-end design, implementation, and operation of authentication and authorization capabilities (OAuth, sessions, tokens, 2FA, passkeys, account recovery) using Go and gRPC. Work includes designing secure APIs, running distributed low-latency services with strong observability and SLOs, partnering across product/security/infrastructure, and mentoring engineers. Requires 5+ years backend experience. Annual base salary range listed.

Work on GitLab's Vulnerability Management team to develop and maintain backend features (primarily Ruby on Rails) for security dashboards, vulnerability reports, and ingestion pipelines. Collaborate with frontend engineers, product, and design; participate in code reviews and on-call rotations; and help improve performance, reliability, and scalability of security data systems.

Join the Institutional Markets team to design, build, and own real-time market data infrastructure used by trading systems, including feed handlers, normalization, distribution, and venue connectivity. Requires 5+ years of backend engineering experience, hands-on experience with market data systems, proficiency in low-latency Java or C++ and high-throughput messaging (e.g., Aeron, SBE), and familiarity with market data protocols (FIX, ITCH/OUCH, multicast). Remote-first (USA) role with quarterly in-person sessions; stated base salary range $207,485–$244,100 USD.

Join Coinbase's CB Node team to optimize performance and reliability of blockchain nodes spanning ~55 protocols. Responsibilities include performance analysis and optimization, building observability/health-check/automated-failover systems, right-sizing node fleet, defining SLOs/SLIs, and supporting protocol upgrades. Requires 2+ years of software engineering experience with systems-level performance work, distributed systems familiarity, and backend programming (Go preferred). Familiarity with profiling and observability tooling (pprof, Datadog, Prometheus, Grafana) is expected.

Work on Gitaly to build GitLab's Git data storage tier, focusing on distributed storage, repository management, performance, reliability, and observability. Own technical initiatives end-to-end, participate in on-call and incident response, collaborate across teams, and mentor peers. Professional experience with Go or another backend/systems language is required; experience with Ruby, Git internals, gRPC, or Git server infrastructure is highly desirable.

Join GitLab's Agent Foundations stage to develop, ship and maintain backend features (primarily in Python) for the Duo Agent Platform, Duo Workflow Service and AI Gateway. Work with LangChain/LangGraph and design/implement APIs (GraphQL/REST), improve automated tests (pytest), troubleshoot production issues on on-call rotations, and collaborate async across cross-functional teams. Role is remote and open to candidates in Canada, Poland, and the United Kingdom.

Object First seeks an AWS Backend Developer in Poland with 3+ years' software engineering experience. The role focuses on Node.js backend development for autoscaling microservices, DynamoDB design, telemetry collection/processing/visualization, message broker integration, and deploying/managing containerized applications and AWS infrastructure (EC2, LightSail, ECS, load balancers) using monitoring/observability tools such as Prometheus, Grafana, and AWS Timestream.

Maropost is hiring a Senior Scala Backend Engineer to design, implement, refactor and test backend services. The role requires 6+ years of Scala backend development, experience mapping business domains into SQL schemas, working with message-based architectures (Pulsar), API design (REST or GraphQL), and deploying to cloud-native infrastructure (Kubernetes). Responsibilities include contributing to technical and product specs, code review, improving processes and CI/CD (CircleCI, GitOps with ArgoCD), and collaborating with cross-functional teams.