{"id":3560198,"url":"https://alion.io/job/london-stock-exchange-lead-software-engineer-financial-data-platform","title":"Lead Software Engineer (Financial Data Platform)","company":{"id":44904,"name":"London Stock Exchange","domain":"londonstockexchange.com","url":"https://alion.io/company/londonstockexchange","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Welcome to the Jungle","truth_index":{"grade":"B","score":77,"open_postings":15,"ghost_share":0,"stale_share":0.933,"repost_share":0,"time_to_fill_p50_days":37,"computed_at":"2026-11-03T05:54:40Z"}},"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":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":101000,"max_usd":203000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":54},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"Amazon Aurora","optional":false},{"name":"Apache Iceberg","optional":false},{"name":"AWS","optional":false},{"name":"AWS CDK","optional":false},{"name":"C#","optional":false},{"name":"C++","optional":false},{"name":"CI/CD","optional":false},{"name":"Databricks","optional":false},{"name":"Delta Lake","optional":false},{"name":"ETL/ELT","optional":false},{"name":"GitHub Actions","optional":false},{"name":"GitLab CI","optional":false},{"name":"Java","optional":false},{"name":"Jenkins","optional":false},{"name":"PostgreSQL","optional":false},{"name":"pySpark","optional":false},{"name":"Python","optional":false},{"name":"Rust","optional":false},{"name":"Scala","optional":false},{"name":"Snowflake","optional":false},{"name":"Spark","optional":false},{"name":"Terraform","optional":false}],"status":"live","first_seen_at":"2026-10-31T00:15:49Z","employer_posted_date":"2026-10-31","last_verified_at":"2026-11-03T04:04:00Z","board_verified":true,"closed_at":null,"days_open":3,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":3},"description":"Join FTSE Russell as a Lead Software Engineer and help build the next-generation index data platform. In this hands-on role, you will design, write, review, and ship production software primarily in Python, own technical direction and architecture, mentor and coach engineers, and drive engineering quality across the team. You will also design data-intensive software, build software that processes data at scale on AWS, and take ownership of production outcomes. This is a collaborative role that values strong teams and shared ownership over individual heroics.\nMissions\nConcevoir, écrire, examiner et expédier des logiciels de production, principalement en Python, en établissant la norme pour une bonne ingénierie.\nDiriger la conception de systèmes logiciels, y compris les services, les API, les bibliothèques partagées, et leurs interfaces, en intégrant la résilience, la performance, la maintenabilité et la réutilisabilité.\nMentorer et coacher les ingénieurs à travers le pair programming, les revues de code, les conseils en conception, et le soutien technique pratique.\nProfil recherché\n - Take a collaborative approach to engineering, value strong teams and shared ownership over individual heroics, and thrive in an Agile environment- Take ownership of technical and production outcomes, including how systems behave in production\n- Have excellent communication skills and adapt explanations of technical decisions to different audiences, creating shared understanding across engineering, product, and business stakeholders\n- Bring depth in software design and architecture: decompose complex problems, define appropriate boundaries and interfaces, evaluate alternatives, and explain the reasoning behind decisions\n- Either lead the development of production systems in Python, or have equivalent depth in Java, C#, C, C++, Scala, Go, or Rust and be motivated to make Python your primary language in this role\n- Have solid AWS experience and strong CI/CD, automation, testing, and software delivery practices\n- Have experience with data-intensive systems, including areas such as batch processing, ETL, schema evolution, data quality, and reasoning about correctness at significant scale\n- Have strong experience with relational databases such as PostgreSQL or Aurora PostgreSQL, including data modelling, query performance, scalability, and schema evolution under production workloads\n- Have big data experience designing and operating systems for datasets and workloads well beyond single-machine scale\n- Have experience with CI/CD tooling such as GitLab CI, Jenkins, or GitHub Actions\n- Have experience in financial markets, index data, investment analytics, or other data-intensive financial products\n- Have experience with Apache Iceberg, Delta Lake, or similar open table formats and lakehouse architectures, Databricks, Snowflake, or comparable data platforms\n- Have experience with infrastructure as code using technologies such as Terraform or AWS CDK, and broader platform or DevOps practices\n- Have experience with Apache Spark / PySpark and optimising large-scale distributed 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