Senior Backend Engineer (Python/Go)

Description

MWDN is a global IT outstaffing company with 23+ years of experience that connects exceptional tech talent with leading companies across Israel, the USA, Great Britain, and Western Europe. We offer opportunities to work on international products in a stable and professional environment.

Why does MWDN rock?

Here’s what you can expect when you join MWDN:

• Security: We carefully vet our clients to minimize risks and ensure reliability and timely payments—no fraud or unpleasant surprises.
• Career support: If a project isn’t the right fit, we support you and actively help find new opportunities that match your skills and career goals.
• Legal assistance: We provide guidance on legal matters, including opening and managing your independent contractor or sole proprietorship status, taxes, and related processes.
• Professional development: We offer English courses and professional growth opportunities, as well as team-building events.

Why choose us? MWDN is ranked among the top 5 IT employers in our region according to DOU. We take pride in our transparency and strong commitment to our team. Curious to learn more? See what our employees say about working with us on DOU.

What is your new project?

• Domain: AdTech
• Location: Israel
• Company size: up to 10 employees
• Founded in: 2021

What makes this project exciting?

The domain involves cutting-edge digital advertising solutions such as real-time bidding, programmatic integrations, audience targeting, and performance optimization. 

What makes you a great fit

• 5+ years building production backend systems in Python (Go is optional)
• 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 cloud (EC2, S3, RDS, Clickhouse, 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-first management with minimal bureaucracy
• A friendly company culture, proven by employees who choose to return
• Flexible working hours
• 29 days of PTO (18 working days per year, plus all national holidays)
• 9 paid recovery days
• Full financial and legal support for independent contractors
• Free English classes, with native speakers or Ukrainian teachers
• Dedicated HR support

Our next steps

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