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.