Backend Software Engineer, (Mid-Level)

Digital Global Systems Inc; McLean (VA); On-site; USD 90,000 - 120,000; Full time

Job summary

A technology solutions provider in McLean, VA is seeking a Backend Software Engineer to manage the Target Tracker service within the platform. The role requires 3+ years in backend development, especially with Python and FastAPI, as well as experience in building low-latency REST APIs. Candidates should also be familiar with data migration strategies. This position thrives on innovation and continuous improvement, supporting a collaborative development environment. Ideal for those passionate about wireless solutions.

Qualifications

• 3+ years backend development experience (Python, FastAPI).
• Experience building low-latency REST APIs.
• Familiarity with data migration strategies.

Responsibilities

• Design and implement the Target Tracker Service.
• Build and maintain REST APIs with strict latency SLOs.
• Integrate tracking services with signal processors and decoders.

Skills

Backend development experience (Python, FastAPI)

Building low-latency REST APIs

Data migration strategies

Testing practices (pytest)

Tools

MySQL

ClickHouse

Job description

Digital Global Systems is seeking a Backend Software Engineer to own and evolve the Target Tracker service within the CLEARSITE™ platform. This role is responsible for persistent target identity, association logic, decoder integration, and migration of legacy tracking systems to a modern, scalable backend architecture.

The engineer will build low-latency services that maintain continuous target tracking across sessions, protocols, and observation gaps using decoded identifiers and RF fingerprint matching.

Key Responsibilities

• Design and implement the Target Tracker Service, including:
  • Dual-path association using decoded identifiers (Wi‑Fi MAC, BLE) and RF fingerprint similarity
  • Track lifecycle management (candidate, active, timeout, split/merge)
• Build and maintain REST APIs with strict latency SLOs (sub‑20ms update paths)
• Implement persistent storage using MySQL and long‑term archival in ClickHouse
• Develop composite fingerprint matching algorithms with policy‑weighted similarity scoring
• Lead legacy system migration efforts, including dual‑write, backfill, cutover, and rollback
• Integrate tracking services with signal processors, decoders, and image‑based detectors
• Support onboarding of new protocol decoders (Wi‑Fi, BLE, LoRa, LTE)
• Maintain high‑quality test coverage and performance validation

Required Qualifications

• 3+ years backend development experience (Python, FastAPI)
• Experience building low‑latency REST APIs
• Familiarity with data migration strategies and real‑time pipelines
• Solid testing practices (pytest, integration, performance)

Preferred Qualifications

• Experience with ClickHouse or columnar databases
• Background in entity resolution, tracking systems, or identity matching
• Familiarity with RF signal metadata or protocol decoding
• Experience with production legacy system migrations

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Digital Global Systems is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, disability, or protected veteran status. We are committed to providing reasonable accommodations to individuals with disabilities. If you need an accommodation during the application or interview process, please contact DGS.

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