{"id":3352995,"url":"https://alion.io/job/xflow-software-development-engineer-in-test-back-end","title":"Software Development Engineer in Test (Back-End)","company":{"id":4431640,"name":"Xflow","domain":"xflow.com","url":"https://alion.io/company/xflow-com","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"BambooHR","truth_index":null},"role":"QA","role_family":"QA","seniority":null,"employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":37000,"max_usd":76000,"period":"year","method":"role_country_seniority_unknown","sample_n":307},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Docker","optional":false},{"name":"GitLab CI","optional":false},{"name":"Go","optional":false},{"name":"gRPC","optional":false},{"name":"JavaScript","optional":false},{"name":"Kubernetes","optional":false},{"name":"Python","optional":false},{"name":"Rest API","optional":false},{"name":"Swagger","optional":false}],"status":"closed","first_seen_at":"2026-10-23T00:00:00Z","employer_posted_date":"2026-10-23","last_verified_at":"2026-10-29T14:58:58Z","board_verified":false,"closed_at":"2026-10-29T14:58:58Z","days_open":6,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":6},"description":"X-FLOW is a mobile game development company established in 2018. We gained recognition after the release of Happy Color, the most popular digital coloring book and one of the most successful ad-driven mobile apps in the world.\nWe are looking for a Software Development Engineer in Test (Back-End)to join our team. We need a skilled Engineer who can design, develop, and maintain reliable automated testing solutions, improve test coverage, and help ensure the quality and stability of our products.\nWe are looking for someone who is particularly strong at developing automation frameworks, creating and maintaining automated test scripts, identifying potential issues, and integrating automated tests into CI/CD pipelines. At the same time, we expect a solid understanding of software testing principles, programming fundamentals, and the entire quality assurance lifecycle, along with the ability to collaborate closely with developers and QA engineers to continuously improve our testing processes.\nKey Responsibilities:\nDesign, develop and maintain test frameworks (backend, load and chaos testing), including setting standards and best practices.\nIntegrate testing and static analysis into CI/CD pipelines (linters, code style and security checks, dependency scanning) and maintain stable quality gates.\nReview development code and apply white-box testing to improve code quality and testability.\nDesign, develop and maintain observability standards and shared libraries (logging, tracing, metrics, profiling), including setting best practices and onboarding guidelines for product teams.\nWork closely with development and DevOps/SRE teams to reduce test and quality debt, improve testability of services, and enhance developer experience (DX) through fast feedback loops\nRequirements:\n5+ years in QA Automation, including 5+ years of backend development or testing with Go, Python or JavaScript.\nExperience building test frameworks from scratch using best practices, with a solid understanding of layered architecture for both backend services and test frameworks.\nExperience with REST/gRPC API testing, working with schemas (OpenAPI/Swagger, Protobuf) and client generation.\nHands-on experience with log analysis, load test result analysis, profiling and troubleshooting performance issues using observability tools (logs, metrics, tracing).\nExperience with GitLab CI, artifact management, sharding/parallelism, retries and pipeline containerization.\nExperience with Docker and Kubernetes (k8s); familiarity with basic AWS services for test environments.\nExperience using AI tools in development and testing, including creating skills and workflows for AI agents.\nRussian - C1 level.\nWhat We Offer:\nCompetitive salary and benefits package.\nOpportunity to work with a talented and passionate team in a creative and dynamic environment.\nFlexible working hours and remote/office work options.\nCareer growth and professional development opportunities.\nA fun and inclusive company culture that celebrates diversity and creativity.\nJoin us and let’s create great content together!\nWhen you apply for this role, we process your personal data in accordance with our Candidate Privacy Notice( https://xflowgames.com/candidate-privacy-notice).","description_format":"text","description_chars":3239,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"Russian","level":"Advanced (C1)","optional":false}]},"benefits":["Flexible schedule","Professional development"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-27T19:11:41Z"},{"event":"close","at":"2026-10-29T14:58:58Z"}],"visa":[],"liveness":null,"pay":null,"html_url":"https://alion.io/job/xflow-software-development-engineer-in-test-back-end","json_url":"https://alion.io/job/xflow-software-development-engineer-in-test-back-end.json","meta":{"generated_at":"2026-10-31T20:31:00Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":32274,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-01T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":4431640},"rest":"https://alion.io/mcp/rest/get_company?id=4431640"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fxflow-software-development-engineer-in-test-back-end"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fxflow-software-development-engineer-in-test-back-end"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fxflow-software-development-engineer-in-test-back-end"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/xflow-software-development-engineer-in-test-back-end\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fxflow-software-development-engineer-in-test-back-end"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3352995}},{"tool":"search_jobs","arguments":{"company":"xflow.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3352995},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); 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