{"id":2827048,"url":"https://alion.io/job/london-stock-exchange-group-principal-engineer-aws-java","title":"Principal Engineer (AWS & Java)","company":{"id":5734,"name":"London Stock Exchange Group","domain":"lseg.com","url":"https://alion.io/company/lseg","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":80,"open_postings":157,"ghost_share":0,"stale_share":0.987,"repost_share":0,"time_to_fill_p50_days":13,"computed_at":"2026-10-20T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"lead","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":["Nottingham, United Kingdom","London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":86000,"max_usd":173000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":49},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Incident Management","optional":false},{"name":"Java","optional":false}],"status":"live","first_seen_at":"2026-06-09T00:00:00Z","employer_posted_date":"2026-06-09","last_verified_at":"2026-10-20T10:42:22Z","board_verified":true,"closed_at":null,"days_open":133,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":133},"description":"About Us:\nLSEG (London Stock Exchange Group) is more than a diversified global financial markets infrastructure and data business. We are dedicated, open-access partners with a dedication to excellence in delivering the services our customers expect from us. With extensive experience, deep knowledge and worldwide presence across financial markets, we enable businesses and economies around the world to fund innovation, manage risk and create jobs. It’s how we’ve contributed to supporting the financial stability and growth of communities and economies globally for more than 300 years. Through a comprehensive suite of trusted financial market infrastructure services - and our open-access model - we provide the flexibility, stability and trust that enable our customers to pursue their ambitions with confidence and clarity.\nLSEG is headquartered in the United Kingdom, with significant operations in 70 countries across EMEA, North America, Latin America and Asia Pacific. We employ 25,000 people globally, more than half located in Asia Pacific. LSEG’s ticker symbol is LSEG.\nOur People:\nPeople are at the heart of what we do and drive the success of our business. Our culture of connecting, creating opportunity and delivering excellence shape how we think, how we do things and how we help our people fulfil their potential. We embrace diversity and actively seek to attract individuals with unique backgrounds and perspectives. We break down barriers and encourage teamwork, enabling innovation and rapid development of solutions that make a difference. Our workplace generates an enriching and rewarding experience for our people and customers alike. Our vision is to build an inclusive culture in which everyone feels encouraged to fulfil their potential.\nWe know that real personal growth cannot be achieved by simply climbing a career ladder - which is why we encourage and enable a wealth of avenues and interesting opportunities for everyone to broaden and deepen their skills and expertise. As a global organisation spanning 70 countries and one rooted in a culture of growth, opportunity, diversity and innovation, LSEG is a place where everyone can grow, develop and fulfil your potential with meaningful careers.\nRole Description\nWe are seeking a Principal Engineer to act as the most senior hands-on technical expert for our leading Risk Screening platform. This role partners closely with architecture, service, product, and engineering teams to ensure that agreed designs are implemented to the highest technical and operational standards.\nA core focus of the role is ownership of the system’s non-functional characteristics, including end-to-end latency, cloud scalability, resilience, and the effective handling of large and growing data sets.\nThe Principal Engineer ensures these qualities are deliberately designed for, correctly implemented, and continuously validated in production.\nRather than owning architecture in isolation, the Principal Engineer is the expert implementor and problem solver: translating architectural intent into robust, performant, and secure production systems. You will use your knowledge of AWS Services and Java development to tackle the hardest technical challenges, proactively identify operational risks, and provide deep technical guidance that sets the highest standard across all engineering teams working on the product.\nThis is the most senior individual contributor role with broad influence, focused on technical excellence, delivery confidence, and long-term sustainability.\nTechnical Leadership & Implementation Excellence\nAct as the senior-most technical authority for implementation within the Risk Screening platform, ensuring designs are realised accurately and pragmatically.\nWork in close partnership with enterprise and solution architects to validate designs, challenge assumptions, and guide effective development approaches by the engineering teams.\nLead the implementation of the most complex and business-critical changes, setting the standard for quality, performance, and maintainability.\nProvide hands-on expertise in Java-based systems, including concurrency, performance tuning, memory management, and API design.\nNon-Functional Ownership & System Performance\nTake a leading role in defining, implementing, and validating non-functional requirements, including system latency, throughput, scalability, and reliability.\nDrive solutions for cloud scaling and capacity management, ensuring the platform performs predictably under variable and peak loads.\nProvide deep expertise in working with large databases and data stores, including performance optimisation, data access patterns, and operational scaling.\nProblem Solving & Technical Decision Support\nSolve the most complex and ambiguous technical problems, particularly those spanning multiple components or teams.\nAct as a point of escalation for deep technical issues that require system-level understanding and experience.\nSupport engineering teams in making sound technical decisions, helping them understand trade-offs and long-term consequences.\nCloud & Platform Expertise (AWS)\nServe as a deep AWS expert, guiding teams on best-practice use of AWS services with a strong focus on elastic cloud scaling and performance under load.\nEnsure implementations support horizontal and vertical scaling, efficient resource utilisation, and predictable behaviour as demand grows.\nGuide and review approaches to autoscaling, and workload management, aligned with agreed architectures.\nReview cloud implementations to confirm they meet expectations for availability, scalability, cost-efficiency, and compliance.\nOperational Excellence & Risk Management\nProactively identify operational risks, scaling limits, and reliability concerns within existing and planned implementations.\nDrive improvements in resilience, monitoring, alerting, and incident prevention, informed by production behaviour.\nPartner with Site Reliability Engineers, platform, and operations teams to improve system operability and reduce customer impact.\nEngineering Standards & Quality\nChampion engineering standards across coding, testing, deployment, and operational readiness.\nConduct deep technical reviews of critical changes, focusing on non-functional requirements such as performance, security, and reliability.\nHelp teams reduce technical debt through pragmatic, incremental improvements aligned to product priorities.\nCoaching, Mentorship & Influence\nAct as a technical mentor and coach to senior engineers and technical leads across the organisation.\nSupport engineers in developing stronger implementation skills and deeper system-level thinking.\nInfluence engineering culture through example, constructive challenge, and a focus on practical excellence.\nRequired Skills & Experience\nExtensive experience as a Principal Engineer, or equivalent senior technical role on large-scale, production systems.\nDeep, hands-on expertise in Java (Java 11+ preferred), including JVM behaviour, concurrency, and performance optimisation.\nStrong, practical experience building and running systems on AWS, with a focus on real-world operational trade-offs.\nProven ability to implement and operate distributed systems at scale, with particular emphasis on performance and scalability.\nStrong experience working with large databases or data platforms, including performance tuning and operational management.\nStrong understanding of production operations, including incident management, observability, and reliability engineering.\nAbility to influence and guide teams through technical credibility rather than formal authority.\nCareer Stage:\nManagerLondon Stock Exchange Group (LSEG) Information:\nJoin us and be part of a team that values innovation, quality, and continuous improvement. If you're ready to take your career to the next level and make a significant impact, we'd love to hear from you.\nLSEG is a leading global financial markets infrastructure and data provider. Our purpose is driving financial stability, empowering economies and enabling customers to create sustainable growth.\nOur purpose is the foundation on which our culture is built. Our values of Integrity, Partnership, Excellence and Change underpin our purpose and set the standard for everything we do, every day. They go to the heart of who we are and guide our decision making and everyday actions.\nWorking with us means that you will be part of a dynamic organisation of 25,000 people across 65 countries. However, we will value your individuality and enable you to bring your true self to work so you can help enrich our diverse workforce.\nWe are proud to be an equal opportunities employer. This means that we do not discriminate on the basis of anyone’s race, religion, colour, national origin, gender, sexual orientation, gender identity, gender expression, age, marital status, veteran status, pregnancy or disability, or any other basis protected under applicable law. Conforming with applicable law, we can reasonably accommodate applicants' and employees' religious practices and beliefs, as well as mental health or physical disability needs.\nYou will be part of a collaborative and creative culture where we encourage new ideas. We are committed to sustainability across our global business and we are proud to partner with our customers to help them meet their sustainability objectives. Our charity, the LSEG Foundation provides charitable grants to community groups that help people access economic opportunities and build a secure future with financial independence. Colleagues can get involved through fundraising and volunteering.\nLSEG offers a range of tailored benefits and support, including healthcare, retirement planning, paid volunteering days and wellbeing initiatives.\nPlease take a moment to read this privacy notice carefully, as it describes what personal information London Stock Exchange Group (LSEG) (we) may hold about you, what it’s used for, and how it’s obtained, your rights and how to contact us as a data subject.\nIf you are submitting as a Recruitment Agency Partner, it is essential and your responsibility to ensure that candidates applying to LSEG are aware of this privacy notice.","description_format":"text","description_chars":10203,"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":["Paid volunteering days","Retirement plans"],"hiring_locations":[{"name":"China","iso":"CN","kind":"region"},{"name":"India","iso":"IN","kind":"region"},{"name":"Japan","iso":"JP","kind":"region"},{"name":"Australia","iso":"AU","kind":"region"},{"name":"Indonesia","iso":"ID","kind":"region"},{"name":"Malaysia","iso":"MY","kind":"region"},{"name":"New Zealand","iso":"NZ","kind":"region"},{"name":"Pakistan","iso":"PK","kind":"region"},{"name":"Philippines","iso":"PH","kind":"region"},{"name":"South Korea","iso":"KR","kind":"region"},{"name":"Taiwan","iso":"TW","kind":"region"},{"name":"Thailand","iso":"TH","kind":"region"},{"name":"Vietnam","iso":"VN","kind":"region"},{"name":"American Samoa","iso":"AS","kind":"region"},{"name":"Bangladesh","iso":"BD","kind":"region"},{"name":"Bhutan","iso":"BT","kind":"region"},{"name":"Brunei Darussalam","iso":"BN","kind":"region"},{"name":"Cambodia","iso":"KH","kind":"region"},{"name":"Cook Islands","iso":"CK","kind":"region"},{"name":"East Timor","iso":"TL","kind":"region"},{"name":"Fiji","iso":"FJ","kind":"region"},{"name":"French Polynesia","iso":"PF","kind":"region"},{"name":"Guam","iso":"GU","kind":"region"},{"name":"Kiribati","iso":"KI","kind":"region"},{"name":"Laos","iso":"LA","kind":"region"},{"name":"Maldives","iso":"MV","kind":"region"},{"name":"Marshall Islands","iso":"MH","kind":"region"},{"name":"Micronesia","iso":"FM","kind":"region"},{"name":"Mongolia","iso":"MN","kind":"region"},{"name":"Nauru","iso":"NR","kind":"region"},{"name":"Nepal","iso":"NP","kind":"region"},{"name":"New Caledonia","iso":"NC","kind":"region"},{"name":"Niue","iso":"NU","kind":"region"},{"name":"Norfolk Island","iso":"NF","kind":"region"},{"name":"Northern Mariana Islands","iso":"MP","kind":"region"},{"name":"Palau","iso":"PW","kind":"region"},{"name":"Papua New Guinea","iso":"PG","kind":"region"},{"name":"Pitcairn Islands","iso":"PN","kind":"region"},{"name":"Samoa","iso":"WS","kind":"region"},{"name":"Solomon Islands","iso":"SB","kind":"region"},{"name":"Sri Lanka","iso":"LK","kind":"region"},{"name":"Tokelau","iso":"TK","kind":"region"},{"name":"Tonga","iso":"TO","kind":"region"},{"name":"Tuvalu","iso":"TV","kind":"region"},{"name":"Vanuatu","iso":"VU","kind":"region"},{"name":"Wallis and Futuna","iso":"WF","kind":"region"},{"name":"Hong Kong","iso":"HK","kind":"region"},{"name":"Singapore","iso":"SG","kind":"region"},{"name":"Macau","iso":"MO","kind":"region"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Data Providers & Datasets","Stock Exchanges & Market Infrastructure","Financial Data & Market Intelligence"],"lifecycle":[{"event":"open","at":"2026-10-18T23:39:09Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Senior or Specialist Worker, Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Global Business Mobility: Senior or Specialist Worker; 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