Senior Backend Engineer (AI Project) at opn – Bangkok | Jobyssey

At Omise, we believe the digitalization of the economy has opened up the world and offers endless opportunities to grow and make meaningful connections with one another. Omise is powered by its payment infrastructure sister company, Omise Payment Holdings, which provides one-stop online payment solutions.

Omise connects people, businesses and society in innovative ways to provide fair and open access to a growing economic ecosystem under its vision of enabling access to the digital economy for everyone. We are on a mission to make digital finance seamless and borderless for people and businesses. Our solutions are used by thousands of companies worldwide including Toyota, ByteDance, ICBC, SCB, True, Allianz Ayudhya, McDonald’s, BMW, King Power and Pomelo.

We are obsessed with solving financial coordination problems and developing new business models and technology that enable businesses to grow. We focus on addressing financial complexities and chokepoints by offering seamless and borderless solutions for our customers because we want them to focus on their core business and value proposition.

As a value-driven organization, we are dedicated to selecting and retaining the sharpest minds across all functions. Help us make digital finance seamless and borderless for people and businesses.

Role Overview

We are building a production-grade GenAI platform focused on privacy, security, and
enterprise use cases.

As a Senior Backend Engineer, you will design and build high-performance backend systems
that power LLM inference, retrieval-augmented generation (RAG), and agent-based workflows all with strong guarantees around data protection and compliance.

This role sits at the intersection of backend engineering, distributed systems, and applied
AI infrastructure.

What you will be working on

A next-generation AI platform used in real-world enterprise scenarios.
Systems that balance performance, safety, and privacy.
A fast-moving environment where research meets production engineering.

Responsibilities

Design and build scalable backend services and APIs (REST/gRPC) for AI-powered applications.
Develop systems for LLM inference orchestration, including:
○ Query processing pipelines
○ Context enrichment (e.g., retrieval, memory, tools)
Implement runtime safety and validation layers:
○ Input/output filtering
○ Policy enforcement
○ Abuse and injection detection
Build and optimize model serving integrations for high-throughput, low-latency inference.
Develop data pipelines and storage systems for logs, metadata, and auditability.
Work closely with ML engineers to productionize research into reliable services.
Contribute to system reliability, observability, and performance optimization

You

Core Engineering

5–10+ years of experience in backend or distributed systems engineering.
Strong proficiency in Python, Go, or similar backend languages.
Experience designing scalable APIs and microservices.

Systems & Infrastructure

Experience with cloud platforms (AWS/GCP/Azure).
Familiarity with Kubernetes and containerized workloads.
Strong understanding of system design, reliability, and performance trade-offs.

AI / Data Systems (Preferred) Experience working with:

LLM-based systems
RAG pipelines or search systems
High-throughput inference services

Security & Reliability

Experience designing secure systems (auth, access control, data protection).
Understanding of multi-tenant systems and isolation.

Nice to Have

Experience with LLM serving frameworks.
Familiarity with real-time or event-driven architectures.
Exposure to privacy-preserving or compliance-driven systems.
Experience building developer platforms or APIs.

How to apply

If you liked what you read and believe to be up for the challenge, we'd be pleased to welcome you to the recruitment process for this position. Simply click on apply and submit your contact info. Afterward, this will happen next:

The hiring team will review your application
2-3 Interviews with the hiring team, People Operations team and all stakeholders involved in the process

Why you’ll love it here

Work with other talented, ambitious international colleagues who love their craft
A modern and well-equipped work environment
Flexible working hours
A medical healthcare plan and annual health check-up
A friendly bunch of colleagues

What we believe in

We cultivate teamwork and a trust-based working culture
We celebrate diversity and continuous improvement
Giving our employees the opportunity and create for their own success

About Omise

Founded in 2013, 500 people
Headquartered in Japan, with operational headquarters in Bangkok and offices in Singapore, Indonesia, and Malaysia.
Raised over $236M of funding to date from institutional investors including SCB10X, SPARX Group Co. Ltd., Toyota Financial Services Corporation, JIC Venture Growth Investments, MUFG Bank, Mars Growth Capital, Ascend Venture Group, and more
Won Digital Startup of the Year at Digital Thailand Big Bang 2017
Won Forbes Japan Startup of the Year 2018
Won 3 awards from International Business Magazine Award 2020
- Most Innovative Electronic Payment Platform for Singapore
- Most Innovative Seamless Transactions Provider for Singapore
- Best Payment Solutions Provider in Singapore
Won Mizuho Innovation Award 2022 (Q2)

Life at Omise

Nearly 500 employees work from our six office locations as well as remotely from home or co-working spaces. While we are a global company, a lot of our thinking goes into how to solve payment problems at the hyper-local level to help businesses scale and reach their customers.

Our core values — simple, real, and beautiful serve as our North Star and are integrated into how we work and the results of our work.

At Omise, we empower people to embrace project-ownership and take initiative. We love to see our employees act as the owner of the outcome and confidently provide solutions to each challenge, taking a collaborative teamwork approach. Our fellow employees are encouraged to discuss and share ideas, and are given the freedom to explore all areas of their work, in order to achieve the expected results.

People at Omise are from different backgrounds and together, we contribute to creating an inclusive, friendly, and safe working environment. As a company, we embrace diversity and value open discussions, a learning mindset, professionalism, and respect. “Growing with us” means to celebrate the challenges and to always look for opportunities to learn, develop your skills, and move one step forward each day. If this is the work environment you are looking for, then get in touch with us.

We look forward to hearing from you. Omise embraces diversity and nourishes an open and inclusive work environment. We are home to over 35 nationalities and all decisions to hire, promote or discharge are based on merit, competence, performance, and business needs.

We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, genetic information, gender, sexual orientation, gender identity or expression, veteran status, or any other applicable legally protected characteristics.

* Discover how Omise prioritizes and protects your privacy and data by clicking HERE to explore our Human Resources privacy policy before you embark on your journey with us.

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