Senior Python Backend Developer

Wissen; Bengaluru; Hybrid; INR 1,800,000 - 2,400,000; Full time

Job summary

Wissen Technology in Bengaluru is seeking a Senior Python Backend Developer to own the core processing engine and related services responsible for turning financial events into journal lines within a fixed batch window. You will be the most performance- and correctness-critical seat on the team.

Responsibilities include batch orchestration end-to-end, data-quality gates, currency translation, reconciliation, and robust REST APIs.

Qualifications

• 5-10 years professional Python experience, including asynchronous programming.
• Experience with FastAPI, Django or Flask in production.
• Expertise in PostgreSQL with set-based design, upserts, and high-volume data processing.

Responsibilities

• Own the processing engine: set-based SQL inside Python services and concurrent processing.
• Own batch orchestration end to end: data-quality gate, currency translation, revaluation, snapshots, period close, idempotent stages.
• Own performance and concurrency: transaction boundaries, chunk sizing, deadlock handling with backoff.
• Design services, inter-service contracts, retry semantics and API versioning.
• Design and implement REST APIs for processing, configuration and reporting.
• Build accounting capability: manual journals, unposting, approval workflow, maker/checker lifecycle.
• Integrate message queues with duplicate controls, dead-lettering and replay.

Skills

Python

Asynchronous programming

FastAPI/Django/Flask

PostgreSQL

SQL optimization

REST API design

Batch processing

Concurrency

Education

MCA/B.E/B.Tech/MTech

Job description

Bangalore South, India | Posted on 09/04/2026

Wissen Technology is hiring for Senior Python Backend Developer

At Wissen Technology, we deliver niche, custom-built products that solve complex business challenges across industries worldwide. Founded in 2015, our core philosophy is built around a strong product engineering mindset-ensuring every solution is architected and delivered right the first time. Today, Wissen Technology has a global footprint with 2000+ employees across offices in the US, UK, UAE, India, and Australia. Our commitment to excellence translates into delivering 2X impact compared to traditional service providers. How do we achieve this? Through a combination of deep domain knowledge, cutting-edge technology expertise, and a relentless focus on quality. We don't just meet expectations-we exceed them by ensuring faster time-to-market, reduced rework, and greater alignment with client objectives. We have a proven track record of building mission-critical systems across industries, including financial services, healthcare, retail, manufacturing, and more. Wissen stands apart through its unique delivery models. Our outcome-based projects ensure predictable costs and timelines, while our agile pods provide clients with the flexibility to adapt to their evolving business needs. Wissen leverages its thought leadership and technology prowess to drive superior business outcomes. Our success is powered by top-tier talent. Our mission is clear: to be the partner of choice for building world-class custom products that deliver exceptional impact-the first time, every time.

Job Summary:

Own the core processing engine and the services around it, the code that turns a day of financial events into millions of journal lines inside a fixed batch window. The most performance and correctness critical seat on the team.

• Experience: 5 - 10Years
  
• Mode of Work: Hybrid
  
• Education Qualification: MCA/B.E/B.Tech/MTech
  

Key Responsibilities & Duties:

• Own the processing engine: set-based SQL inside Python services, concurrent processing, dynamic work partitioning, dimension keys, ledger fan-out
• Own batch orchestration end to end: data-quality gate, currency translation, revaluation, snapshots, period close, every stage idempotent and resumable
• Own performance and concurrency: transaction boundaries, chunk sizing, deadlock handling with backoff, connection usage
• Design services, inter-service contracts, retry semantics and API versioning
• Design and implement REST APIs for processing, configuration and reporting
• Build accounting capability: manual journals, unposting, approval workflow, maker/checker rule lifecycle, suspense, year-end roll, GL export
• Integrate message queues with duplicate controls, dead-lettering and replay

Skills Preferred:

• 5-10 years professional Python, including asynchronous programming
• Production depth in FastAPI, Django or Flask
• Expert SQL and strong PostgreSQL: set-based design, plan awareness, upserts, isolation levels, locking
• REST API design at scale and microservice architecture in practice
• Demonstrated high-volume batch engineering, has taken a workload from hours to minutes and can explain why it worked
• Correctness engineering: idempotency, exactly-once under retry, reconciliation, financial precision