Senior Software Engineer (C++)

Senior Software Engineer (C++) Hybrid working model Blis is an award-winning, global leader in big data analytics and advertising. We help brands like McDonald’s, Samsung, and Mercedes-Benz reach the right audiences, ethically and responsibly. We’re champions of privacy-first, people-controlled data, with offices across four continents and our HQ in the UK. We’re looking for experienced C++ software engineers to join our Real-Time Applications team , building high-throughput, low-latency trading and measurement systems. Our platforms handle hundreds of thousands of requests per second , powered by multi-level machine learning models, with 98th percentile latency under 20ms . You’ll work on systems that trade across global marketplaces and process massive data volumes, as well as projects spanning proprietary location data algorithms and third-party integrations. As a tech-first product company, the work you do will be visible, meaningful, and directly impactful. At Blis, engineers are builders and problem-solvers. You’ll help design, build, and evolve products, collaborating closely with engineers, data scientists, and product managers. We value strong design principles, lean thinking, and understanding the why behind what we build. You’ll also be part of a supportive, collaborative team that values mentoring, pairing, and tackling ambitious challenges together. Location : Edinburgh The Role: Innovate, implement, support, and iterate on our real-time application systems, infrastructure, and code Write and improve high-performance, highly efficient, and highly maintainable C++ Ensure our designs and systems are highly available, resilient, and secure Support and mentor other members of the team Commitment to Blis' Inclusion initiatives & 5 step sustainability plan Required Knowledge: C++, including Boost Networking topics from asynchronous connection handling to TCP/IP parameters Concurrency RESTful APIs and web-serving concepts Big Data structures and high-frequency data processing algorithms at scale Relational and non-relational databases and concepts Server-side Linux use and administration Cloud infrastructure concepts and utilisation Engineering design principles and when to go fast and when to go slow Desired Knowledge: DevOps topics including CI/CD, Jenkins, Docker, Kubernetes, Prometheus & Grafana Machine learning algorithms and how to implement them Prior work with algorithmic trading systems Understanding of compiler output (assembly) Expected Background: 5+ years experience as a systems engineer or architect for complex, high-performance systems Degree in Computer Science, Software Engineering, or similar Key Technologies We Use (not necessarily required for the role) : Google Cloud, Google Cloud Composer, BigQuery, Spark, Solr, Elasticsearch, Druid, PostgreSQL, ScyllaDB, Redis, Kafka, Flink, Docker, Kubernetes, Kibana, Jenkins, Prometheus, Grafana, Github, C++, Python, Scala, Compiler Explorer What Blis Can Offer: We want you to be well and thrive and we care about your growth as a person and in your career. Our benefits include: Comprehensive private healthcare Matched pension scheme Paid time off and one extra day off for your birthday Enhanced paternity and maternity leave Career coaching and development paths Hybrid working… and more! We are an equal opportunity employer and strongly believe that diversity makes us a better company. Role Title Synonyms: C++ Engineer, C++ Developer, C++ Systems Engineer About us Blis is the only omnichannel DSP that unites telco data, real-world movement patterns, and transactions to deliver a complete view of the consumer. Powered by T-Mobile and built for precision at scale, Blis' omnichannel platform helps marketers map the full purchase journey – from impression to transaction – and expand their audience reach, driving incremental results across every screen. Founded in the UK in 2004, Blis employs over 300 global employees across 14 offices in 11 countries. Our values Brave We're leaders not followers An innovation and growth mindset helps us solve everyday challenges and achieve breakthroughs. Our passion drives us to innovate. We don’t see barriers, just possibilities. We take ownership and hold ourselves accountable for outcomes, good and bad – and we don’t pass the buck. Love our clients We're client obsessed We do what we say and build trusted relationships with our partners for the long term. We act with integrity. We put our clients at the centre of our business. We obsess over the best insights, ideas and solutions to deliver WOW and work with honesty and accountability to get it done. Inclusive We're one team We are empathetic and embrace diversity. Everyone has a voice and can bring their authentic self to work. We care about and support each other – with humility and good humour. Mutual respect and wellbeing are key. We strive to eliminate bias and be open and transparent. Solutions driven We're action oriented Speed matters in business, so we're solution-driven and action-oriented. We value simplification and calculated risk taking. We are lean, agile and resourceful self-starters. We collaborate and break silos, working thoughtfully and with urgency to solve problems, while learning from mistakes and celebrating wins.