{"id":3973247,"url":"https://alion.io/job/optiveum-senior-c-software-engineer-fix-client-connectivity","title":"Senior C++ Software Engineer (FIX, Client Connectivity)","company":{"id":685848,"name":"Optiveum","domain":"optiveum.com","url":"https://alion.io/company/optiveum","size_band":null,"is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"Teamtailor","truth_index":{"grade":"A","score":100,"open_postings":3,"ghost_share":0,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":22,"computed_at":"2026-11-09T06:03:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Kraków, Poland"],"countries":["PL"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":120,"max":130,"currency":"PLN","period":"hour","gross":null,"usd_annual":66000},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"CI/CD","optional":false},{"name":"Configuration Management","optional":false},{"name":"Linux","optional":false},{"name":"STL","optional":false},{"name":"Unix","optional":false},{"name":"Java","optional":true}],"status":"live","first_seen_at":"2026-11-09T11:29:55Z","employer_posted_date":"2026-11-09","last_verified_at":"2026-11-09T17:02:13Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"Senior C++ Software Engineer (FIX, Client Connectivity)\nAbout the Offer\nWe are currently looking for a Senior C++ Software Engineer to join the team of one of the world's leading global investment banks. The project is delivered together with a large international IT services company. For this role, Optiveum is the recruitment and contracting party, which means you will sign the cooperation agreement directly with us.\nYou will work on the bank's global client connectivity and equity trading systems, as part of a multi-year initiative to modernise its connectivity platforms. The role is strongly hands-on: about 80-90% of your time goes to development work.\nKey Details:\nRate: 120-130 PLN/h (B2B), depending on experience\n\nWork Model: Hybrid, 3 days per week from the client's office (non-negotiable), full-time\n\nLocation: Kraków (candidates must live in or within commuting distance of Kraków)\n\nStart: December 2026\n\nResponsibilities:\nWork in a global team to define architectural solutions and solve complex technical challenges\n\nContribute to the modernisation of existing client connectivity platforms, improving their scalability, reliability and maintainability\n\nDeliver technical enhancements: performance improvements, client-specific functionality and compliance with changing market regulations\n\nHelp transform the team's delivery ecosystem by adopting DevOps practices and advancing CI/CD\n\nCollaborate with business analysts, developers and business stakeholders across regions\n\nHands-on development: coding, technical design, configuration management, release execution and post-implementation support\n\nRequirements:\n5-7 years of hands-on C++ experience: multi-threading, data structures, STL, casting, templates, pointers, socket programming and algorithms\n\nProgramming in Linux/Unix environments\n\nDevelopment experience in a financial environment on order management systems, the FIX protocol and order-state handling (essential)\n\nExperience building high-performance, high-availability, high-throughput, low-latency, transaction-oriented distributed systems\n\nStrong knowledge of the equity trading environment, ideally in a multi-regional setting\n\nExcellent English communication skills (business and technical)\n\nPolish or EU citizenship, or a permanent residence / work permit valid for at least 12 months\n\nNice to Have:\nPrior experience working on a client connectivity system\n\nJava experience: Core Java, Collections and Reflection\n\nLevel 3 (development) support in a pressurised production environment\n\nRecruitment Process:\nTechnical tasks are done live: please have your environment, tools and language/framework versions set up and tested beforehand. The use of AI tools, coding assistants or code generators during interviews is not allowed\n\nThe selected candidate will go through a background check, so the dates and employers in your CV must be accurate\n\nYour name in the application and CV must match your official ID document exactly (Polish citizens: please include all first names)\n\nCandidates who took part in a recruitment process for this IT services partner or this bank in the last 12 months cannot be considered","description_format":"text","description_chars":3151,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"Polish","level":"All levels","optional":false},{"language":"English","level":"Upper-Intermediate (B2)","optional":false}]},"benefits":["Equity"],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-11-09T17:02:13Z"}],"visa":[],"liveness":{"score":52,"band":"ok","label":"Likely open","p_open":1,"p_active":0.516,"p_room":1,"age_days":0,"expected_fill_days":22,"reasons":["conf:3","agency","win:early"],"computed_at":"2026-11-09T20:02:23Z"},"pay":{"stated_usd_annual":66000,"is_top_pay":false},"html_url":"https://alion.io/job/optiveum-senior-c-software-engineer-fix-client-connectivity","json_url":"https://alion.io/job/optiveum-senior-c-software-engineer-fix-client-connectivity.json","meta":{"generated_at":"2026-11-09T20:02:23Z","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":6741,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-10T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"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":685848},"rest":"https://alion.io/mcp/rest/get_company?id=685848"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Foptiveum-senior-c-software-engineer-fix-client-connectivity"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"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%2Foptiveum-senior-c-software-engineer-fix-client-connectivity"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"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%2Foptiveum-senior-c-software-engineer-fix-client-connectivity"},{"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/optiveum-senior-c-software-engineer-fix-client-connectivity\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Foptiveum-senior-c-software-engineer-fix-client-connectivity"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3973247}},{"tool":"search_jobs","arguments":{"company":"optiveum.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3973247},"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); https://alion.io/mcp with an Alion account has everything. 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