{"id":2774679,"url":"https://alion.io/job/ig-senior-javafix-engineer-ig-prime","title":"Senior Java/FIX Engineer - IG Prime","company":{"id":38407,"name":"IG","domain":"ig.com","url":"https://alion.io/company/ig","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":null},"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":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":84000,"max_usd":165000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":130},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Java","optional":false},{"name":"Linux","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false},{"name":"Spring Framework","optional":false}],"status":"live","first_seen_at":"2026-10-16T00:00:00Z","employer_posted_date":"2026-10-16","last_verified_at":"2026-10-19T23:05:49Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"description":"Job Title\nSenior Java/FIX Engineer - IG PrimeJob Description\nPrime Java/FIX Engineer\nSo, who are we?\nIG Group is a FTSE 100 fintech operating across five continents, serving over 1.4m customers and handling billions of dollars in transactions - built on scale, trust, and proof. We didn't pivot to innovation; it's how we've always operated. What that means for the people who work here is real: genuinely complex problems to solve, the technology and resources to tackle them properly, and the kind of scope that's rare in established businesses.\nThe bar is high - bring a curious and forward-thinking mindset and we'll give you the platform to define what comes next.\nJoin us at IG - the future gets built here.\nYour Team:\nJoin IG's public-facing API team, who own open spec trading APIs and FIX protocol using cutting edgetechfor IG intuitional clients. Delivering secure, high-performance, low-latency solutions.\nYour role in the Team’s Success:\nOur team sits within the IG Prime division, building the institutional side of IG's business. The Prime API team owns the APIs that connect IG to institutional clients, brokers and partners across global markets - the trading and market-data plumbing that our largest clients depend on every trading day. Maintaining and modernising our FIX-based APIs is one of the team's core functions, and it's the area this role would lead on.\nThat means real-time price distribution, order and execution flow, and reference data, running continuously through the trading day. When these systems degrade, clients notice immediately - so resilience, correctness and latency aren't aspirations here, they're the job.\nYou'll join at a genuinely interesting point: we're building a new suite of cloud-native trading APIs alongside modernising our existing FIX estate. There's greenfield work and there's hard, high-stakes work on live systems, and you'd get both.\nWhat you’ll do:\nDesign and build new trading and market-data APIs - REST, streaming and FIX - used directly by institutional clients\nModernise IG's FIX offering: bringing our session handling, market-data distribution and order flow up to the standard of the best venues in the industry\nSolve the problems that come with real-time distributed systems in a trading environment - resilience under load, recovery from failure, and correctness in flows where getting it wrong has direct client impact\nOwn your services end to end: architecture, implementation, testing, deployment and production behaviour\nUse observability data to understand and improve latency, throughput and reliability - and to find the problems clients haven't reported yet\nWork directly with FIX Support, dealing desks and client-facing teams to diagnose live issues. Client-facing technical support is a real part of the role, and some of the most valuable work we do\nHelp shape how the team works, including our move towards spec-driven, AI-assisted development - we're early enough that you'd be influencing the approach rather than inheriting it\nRaise the bar for engineering standards on the team: testing, documentation, and challenging designs that won't hold up\nWhat You'll Need:\nSubstantial commercial experience building backend systems in Java - enough that you've owned services in production, made the architectural calls, and lived with the consequences\nStrong command of concurrency and multi-threading - not just the APIs, but the failure modes, and how to reason about correctness under load\nReal experience with asynchronous and event-driven systems - streaming, messaging or queueing\nSpring Framework in anger, including Spring Boot\nExperience designing and operating externally-facing APIs, where you don't control the client and can't break the contract\nCloud experience, ideally AWS\nLinux proficiency, including shell scripting\nThe analytical instinct to work a hard production problem from symptom to root cause using logs, metrics and traces - and the patience to do it properly rather than guess\nClear communication with non-engineers. You'll be explaining technical constraints to client-facing teams and business stakeholders regularly\nThe perks:\nIt really is more than a job. We think like a start-up, but we deliver like a FTSE 100 - so the bar is high, and we won't pretend otherwise. We work hybrid, which means three days in the office. We’ll recognise your talent and make sure that you can still have a life - at work, and outside of it. Networks, committees, awards, sports and social clubs, mentorships, volunteering opportunities, extra time off… the list goes on.\nCompetitive salary\nFlexible Benefits Package on top of your salary (12%)\nPrivate medical cover for you and your family\nLife insurance\nContribution to gym memberships\n25 Days holiday, with 1 additional day off to celebrate your Birthday & 2 additional days off a year for voluntary work (28 in total)\nThe option to buy or sell holiday days\nA comprehensive global and local onboarding process\nEnhanced primary (maternity), secondary (paternity), and shared parental pay and leave, as well as a range of support and benefits for parents\nNumber of openings\n1","description_format":"text","description_chars":5124,"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":[]},"benefits":["Gym membership","Life insurance"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Online Brokerage & Trading Platforms","Forex & CFD Brokers"],"lifecycle":[{"event":"open","at":"2026-10-17T07:58:21Z"}],"visa":[],"liveness":{"score":82,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.868,"p_room":0.945,"age_days":4,"expected_fill_days":12,"reasons":["conf:6","velocity","win:mid"],"computed_at":"2026-10-20T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/ig-senior-javafix-engineer-ig-prime","json_url":"https://alion.io/job/ig-senior-javafix-engineer-ig-prime.json","meta":{"generated_at":"2026-10-20T09:45:25Z","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":10683,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-21T00:00:00Z"}},"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":38407},"rest":"https://alion.io/mcp/rest/get_company?id=38407"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fig-senior-javafix-engineer-ig-prime"},{"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%2Fig-senior-javafix-engineer-ig-prime"},{"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%2Fig-senior-javafix-engineer-ig-prime"},{"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/ig-senior-javafix-engineer-ig-prime\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fig-senior-javafix-engineer-ig-prime"}]}