System Architect

Tango

Warszawa

On-site

PLN 360,000 - 600,000

Full time

Just now

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Benefits offered by this job

Stock options

Competitive salary

Medical insurance

On-site with WFH 1 day

Lunch budget

Parking

Multisport card

Team spirit

Job summary

Tango is a market-leading live-streaming platform with 450+ million registered users. We seek a senior backend architect to own architecture, define API standards, and integrate AI-powered tooling across services. You will mentor engineers and partner with mobile, data, and cloud teams to scale our backend for real-time, high-throughput operations.

Join a growth-focused culture with opportunities to lead design decisions and drive global-scale improvements in a fast-paced environment.

Qualifications

8–10+ years in backend engineering with architect experience.

Responsibilities

Own backend architecture, data flows, and service boundaries.
Set API design standards and inter-service integration.
Define backend conventions, testing, error handling and docs.
Design for throughput, latency, and failure, fixing bottlenecks.
Choose storage solutions and data ownership between services.
Define how LLMs fit into backend including tool-calling patterns.
Establish coding agent usage, repo context, and guardrails.
Track architectural risks and technical debt with actionable plans.
Evaluate frameworks and third-party services for adoption.
Collaborate with mobile, data, cloud, and product teams to fit backend needs.
Review designs and mentor engineers.

Skills

Java & Spring

Microservices

API design

Cloud & CI/CD

Docker & Kubernetes

Distributed systems

AI coding agents

English communication

Education

Bachelor's in CS

Tools

Kafka

Redis

SQL/NoSQL

Spring Boot

Job description

Description

Tango is a successful, market leader, a live-streaming Platform with 450+ Million registered users, in an industry projected to reach $240 BILLION in the next couple of years. The B2C platform, based on the best-quality global video technology, allows millions of talented people around the world to create their own live content, engage with their fans, and monetize their talents. Tango live stream was founded in 2018 and is powered by 500+ global employees operating in a culture of growth, learning, and success! The Tango team is a vigorous cocktail of hard workers, creative brains, energizers, geeks, overachievers, athletes, and more. We push the limits to bring our app from “one of the top” to “the leader”. The best way to describe Tango's work style is not to use the word “impossible”. We believe that success is a thorny path that runs on sleepless nights, corporate parties, tough releases, and of course our users' smiles (and as we are a LIVE app, we truly get to see our users all around the world smiling right in front of us in real-time!).

Do you want to join the party?

Responsibilities

Own the backend architecture — service boundaries, data flows, and how services communicate.
Set standards for API design, versioning, and integration between our services and external partners.
Define backend conventions: project structure, testing, error handling, documentation, and how architecture decisions get made and recorded.
Design for throughput, latency, and failure — and fix bottlenecks and single points of failure before they cause incidents.
Choose the right storage for each use case, design schemas, and define which service owns which data.
Design how LLMs fit into our backend: agent and tool-calling patterns, MCP servers over our internal systems, context handling, evaluation, and fallbacks when the model gets it wrong.
Set the standard for AI-assisted development — how the team uses coding agents, what belongs in the repo (context files, custom commands, review workflows), and where the guardrails are.
Keep track of architectural risks and technical debt, and turn them into a plan the teams can actually execute.
Evaluate frameworks and third-party services, and decide what we adopt.
Work with mobile, data, cloud, and product teams so the backend fits what they need.
Review designs and mentor engineers.

Requirements

8–10+ years in backend engineering, with recent experience in an architect role.
Deep hands-on experience with Java and Spring (Spring Boot, Spring Cloud).
Strong understanding of microservices and distributed systems, including how they fail.
Solid API design experience (REST, gRPC) and event-driven, asynchronous architectures.
Experience with SQL and NoSQL databases: data modeling, indexing, query optimization.
Practical knowledge of caching (Redis or similar) and tuning systems under load.
Understanding of application security — authentication and authorization, secrets management, data protection.
Working knowledge of Docker and Kubernetes — enough to design systems that run well on them.
Experience with CI/CD, monitoring, and logging.
Daily use of AI coding agents (Claude Code, Cursor, Copilot, or similar) — and a clear view of where they help and where they don't.
Good communication skills and English (Intermediate+).

Would Be a Plus

Experience with high-scale consumer products and real-time systems.
Experience breaking up a monolith or running a large migration.
Hands-on experience with Kafka — topic design, partitioning, consumer groups, delivery guarantees.
JVM performance tuning and profiling.
Hands-on experience with an agent framework (LangGraph, LangChain, or similar) — multi-step flows, state, retries, human-in-the-loop.
Experience building or operating MCP servers for internal tooling.
Familiarity with RAG, vector stores, and embedding-based retrieval.
Experience shipping LLM features to production: prompt and context design, tool calling, MCP, streaming, cost and latency control.
Experience evaluating LLM output — test sets, regression checks, tracing.
Experience with mobile–backend integration.

What we offer: