Senior Developer (Go / Python)

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P&P SolutionsNetwork telemetry

100% zdalnieContractSenior

Salary165 - 195 PLN per hour

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Job Details

Required Skills: DockerPythonKafkaGoLinuxNetworking

Requirements

Have very good knowledge of Go, including concurrency, TCP/UDP servers, efficient decoding, and profiling with pprof.
Have advanced asyncio knowledge, including event loops, tasks, cancellation, backpressure, and asynchronous HTTP communication.
Have experience with multiprocessing and worker pools.
Know L2/L3/L4 protocols, Ethernet, VLAN, MAC/IP, TCP flags, MTU, fragmentation, and IPv4/IPv6.
Have practical experience with IPFIX, NetFlow v5/v9, and sFlow v5, including template-based decoding, sampling, and handling data loss.
Be able to analyze traffic using PCAP and create network packets.
Have experience automating Cisco, Arista, Juniper, or Palo Alto devices through SSH/CLI and APIs, including configuration drift detection.
Have practical experience with application profiling, GC optimization, lock contention analysis, zero-copy, and data structure selection.
Know Linux at the level of sockets, epoll, sysctl tuning, and cgroups.
Have Kafka experience, including partitioning, acks, batching, SASL/Kerberos, and diagnosing consumer lag.
Know Protocol Buffers and columnar or time-series databases, such as ClickHouse.
Have experience with Docker, Kubernetes, IPC such as ZeroMQ, and distributing standalone binaries, including deb/rpm packages, updates, and rollbacks.
Understand distributed systems concepts including eventual consistency, state and cache synchronization, idempotent replay, and resynchronization after disconnection.
Be familiar with code quality and security practices and tools including mypy, golangci-lint, pre-commit, asynchronous tests, snapshot tests, and CI load tests.

Responsibilities

Design and develop high-performance concurrent services in Go and asynchronous systems in Python.
Implement TCP/UDP servers and mechanisms for decoding and processing large volumes of packets.
Develop systems for collecting and analyzing network telemetry, including IPFIX, NetFlow, and sFlow.
Analyze network traffic and debug using PCAP files, packet headers, and network protocols.
Profile applications, identify bottlenecks, and optimize CPU and memory usage.
Integrate with network devices and automate configuration and infrastructure change detection.
Develop data pipelines using Kafka, Protocol Buffers, and columnar or time-series databases.
Design state synchronization, caching, data replay, and resilience mechanisms for prolonged disconnections.
Prepare and deliver software for client environments, including standalone binaries and installation packages.
Maintain code quality, automated tests, dependency security, and deployment reliability.

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