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Senior Backend Engineer (Python)

Remote · Full-time · Senior

Why does MWDN rock?

MWDN connects exceptional tech talent with leading companies across Israel, the USA, Great Britain, and Western Europe. We aim to ensure our employees enjoy a rewarding and secure experience while collaborating with prestigious international clients.

Here’s what you can expect when you get employed by MWDN:

  • Security first. We vet our clients to eliminate risks, ensuring reliability and timely payments for your hard work—no fraud or unforeseen events here!
  • Career support. If a match isn't right, we're here for you. We actively assist our employees in finding new opportunities that fit their skills and aspirations.
  • Legal assistance. We provide guidance on legal matters (e.g., opening and administering your private entrepreneur account, taxes, etc.).
  • Professional development. We offer English courses and other engaging activities, including team-building events.

Why choose us? MWDN is ranked among the top 5 IT employers in our region by DOU, and we pride ourselves on our transparency and commitment to our team. Curious to learn more? Discover what our employees say about us in their DOU reviews: MWDN reviews.

What is your new project?

  • Domain: AdTech
  • Location: Israel
  • Company size: up to 50 employees
  • Founded in: 2021

What makes you a great fit

  • 5+ years building production backend systems in Python
  • Strong AWS experience running scalable, reliable services
  • Proven track record optimizing servers for high load/low latency
  • Deep hands-on with Celery (or similar queues), task orchestration, and distributed systems fundamentals
  • Comfortable with Bash, Linux networking, and performance debugging (perf, eBPF, flame graphs)
  • Solid JavaScript/Web fundamentals (HTTP, TLS, CORS, cookies, caching, CDNs)
  • SQL/NoSQL experience; data modeling for large-scale reads/writes
  • Great communication, team player, fast learner, proactive, and willing to work hard to hit goals
  • At least an upper-intermediate level of English

Will be a plus:

  • RTB/OpenRTB, VAST/VMAP, header bidding, DSP/SSP integrations
  • Redis/DragonflyDB tuning, Kafka/Kinesis, ClickHouse/Redshift, Airflow
  • Docker/K8s, GitHub Actions, ArgoCD; zero-downtime deploys & canary/blue-green
  • Security/compliance in ad systems (PII, consent/TCF)
  • Elasticsearch/Kibana experience

Your day-to-day in this position

  • Design, build, and operate high-throughput, low-latency backend services for ad delivery and analytics
  • Own queue-driven workloads (Celery/Redis/DragonflyDB): throughput, retries, back-pressure, idempotency
  • Optimize performance end-to-end: CPU/memory, networking, asyncio/concurrency, caching, schema/indexing
  • Productionize on AWS (EC2/EKS/Lambda, S3, RDS, ALB/NLB, IAM, elasticsearch)
  • Implement robust observability: metrics, tracing, structured logs, SLOs/alerts
  • Collaborate with product/analytics to ship features fast; run load tests and capacity plans for peak QPS
  • Harden systems for resiliency, cost, and security (least-privilege IAM, secrets, threat modeling)

Why work with us?

  • People-oriented management without bureaucracy
  • The friendly climate inside the company is confirmed by the frequent comeback of previous employees
  • Flexible working schedule
  • 29 paid time off (18 working days per year, plus 11 days — all national holidays)
  • 9 sick leave days
  • Full financial and legal support for private entrepreneurs
  • Free English classes with native speakers or with Ukrainian teachers (for your choice)
  • Dedicated HR

Our next steps

✅ Intro call with a Recruiter — ✅ Intro tech interview — ✅ Technical assessment — ✅ Final client interview — ✅ Offer