Sr Software Engineer

ABOUT SINCH
Sinch is pioneering the way the world communicates. More than 150,000 businesses
— including Google, Uber, Paypal, Visa, Tinder, and many others — rely on Sinch’s
Customer Communications Cloud to power engaging customer experiences through
mobile messaging, voice, and email.
Whether you need to verify users or craft omnichannel campaigns, Sinch makes it
easy. Our AI-infused Super Network, APIs, and applications ensure you can connect
with your customers reliably and securely, at every step of their journey.
At Sinch we “Dream Big”, “Win Together”, “Keep it simple”, and “Make it Happen”.
These values are our foundation!
DESCRIPTION
About the Team
Chatlayer Product is made up of two teams — Platform & Integration and Flow Engine
& Intelligence Integration — sharing a single product roadmap and backlog under
Engineering Manager JR Reynolds. Together the organization includes around 10
engineers, two tech leads, a product manager, and a UX designer. The teams value
honesty, growth, knowledge sharing, collaboration, ownership, and “being pirates” —
a bias toward bold, resourceful action. Communication happens primarily through
Slack and Teams, and we have a strong culture of transparent decision-making and
discoverable collaboration.
Where We’re Heading
Chatlayer is building toward a future of conversations with control — where AI
agents and deterministic workflows work in harmony to solve our customers’
problems. This means evolving from a traditional chatbot platform into an agentic
orchestration system where intelligent automation is grounded by reliable,
predictable flow execution. We’re looking for the right people to help us get there.
About the Role
We are looking for a Senior Software Engineer to help design, build, and scale
Chatlayer’s conversational AI platform. You will work across a real-time, distributed
system that handles text and voice interactions at scale — including WebSocket
infrastructure, bot engine integrations, and platform services. This role requires
someone who is comfortable operating in ambiguity, can drive technical decisions,
and thrives in a team that ships with urgency while investing in system health.
Candidates should bring a knowledgeable and skilled approach to the use of AI in the
software development process itself — we value a balanced, curious, and quality-
driven use of AI tooling. We’re not looking for engineers who blindly generate code or
who refuse to adopt new tools; we want people who apply AI judiciously, maintaining
deep comprehension of what they build while leveraging these tools to move faster
and think bigger. Key Responsibilities
• Design and build backend services supporting Chatlayer’s text and voice
channels, including WebSocket servers and real-time communication
infrastructure
• Work on platform integrations and app-integration frameworks
• Contribute to architectural evolution — decoupling legacy dependencies and
building more modular, vendor-agnostic systems
• Participate in technical decisions around identity management (SinchID),
distributed events and data processing (MongoDB Atlas, Kafka, Temporal), and
new platform capabilities
• Lead code reviews, technical discussions, and knowledge-sharing sessions
within the team
• Mentor and be mentored by other engineers and contribute to a strong
engineering culture rooted in the team’s values
• Support production systems through on-call rotations and incident response
• Invest in system health — improving test coverage, addressing technical debt,
and continuously improving operational processes (Kaizen)
REQUIREMENTS
Required Skills & Experience
• 5+ years of professional software engineering experience
• Strong proficiency in Node.js/TypeScript and/or Go
• Experience with real-time systems — WebSocket, event-driven architectures,
or similar
• Solid understanding and hands-on experience with complex cloud
infrastructure, ideally GCP and/or AWS
• Experience with microservices architecture and distributed systems, including
state management across replicas (e.g., ETCD, Redis)
• Working knowledge of MongoDB or similar document databases
• Experience building and maintaining RESTful APIs and event-driven
architectures (ideally Kafka specifically)
• Strong system design fundamentals — can reason about scalability, latency,
failover, and trade-offs
• Excellent communication skills and comfort working in a distributed, cross-
functional team (CET timezone alignment preferred)
Preferred / Nice-to-Have
• Experience with conversational AI, chatbot/voicebot platforms, or NLP/NLU
pipelines
• Experience with containerisation and orchestration (Docker, Kubernetes)
• Familiarity with identity management systems (OAuth/OIDC)
• Prior experience in a CPaaS, scale-up, or fast-growth product company
Our corporate language is English; please submit your application in English. OUR HIRING PROCESS
We are committed to ensuring a recruitment process that is fair, objective, consistent,
and inclusive. Our approach includes structured, competency-based interviews
designed to evaluate your skills, experience, and qualifications relevant to the role. At
times, we may include a data-driven assessment to enhance our hiring success and
identify candidates likely to excel.
We believe in a two-way process and encourage you to ask questions throughout the
journey. If this role isn’t what you’re looking for, please explore the other
opportunities listed on our career page: https://www.sinch.com/careers/. No matte
who you are, we hope you find an exciting path forward — hopefully with us

ABOUT SINCH 

Sinch is pioneering the way the world communicates. More than 150,000 businesses — including Google, Uber, Paypal, Visa, Tinder, and many others — rely on Sinch’s Customer Communications Cloud to power engaging customer experiences through mobile messaging, voice, and email. 

Whether you need to verify users or craft omnichannel campaigns, Sinch makes it easy. Our AI-infused Super Network, APIs, and applications ensure you can connect with your customers reliably and securely, at every step of their journey. 

At Sinch we “Dream Big”, “Win Together”, “Keep it simple”, and “Make it Happen”. These values are our foundation! 

Chatlayer Product is made up of two teams — Platform & Integration and Flow Engine & Intelligence Integration — sharing a single product roadmap and backlog under Engineering Manager JR Reynolds. Together the organization includes around 10 engineers, two tech leads, a product manager, and a UX designer. The teams value honesty, growth, knowledge sharing, collaboration, ownership, and “being pirates” — a bias toward bold, resourceful action. Communication happens primarily through Slack and Teams, and we have a strong culture of transparent decision-making and discoverable collaboration.

Where We’re Heading

Chatlayer is building toward a future of conversations with control — where AI agents and deterministic workflows work in harmony to solve our customers’ problems. This means evolving from a traditional chatbot platform into an agentic orchestration system where intelligent automation is grounded by reliable, predictable flow execution. We’re looking for the right people to help us get there.

About the Role

We are looking for a Senior Software Engineer to help design, build, and scale Chatlayer’s conversational AI platform. You will work across a real-time, distributed system that handles text and voice interactions at scale — including WebSocket infrastructure, bot engine integrations, and platform services. This role requires someone who is comfortable operating in ambiguity, can drive technical decisions, and thrives in a team that ships with urgency while investing in system health.

Candidates should bring a knowledgeable and skilled approach to the use of AI in the software development process itself — we value a balanced, curious, and quality-driven use of AI tooling. We’re not looking for engineers who blindly generate code or who refuse to adopt new tools; we want people who apply AI judiciously, maintaining deep comprehension of what they build while leveraging these tools to move faster and think bigger.

Key Responsibilities

• Design and build backend services supporting Chatlayer’s text and voice channels, including WebSocket servers and real-time communication infrastructure
• Work on platform integrations and app-integration frameworks
• Contribute to architectural evolution — decoupling legacy dependencies and building more modular, vendor-agnostic systems
• Participate in technical decisions around identity management (SinchID), distributed events and data processing (MongoDB Atlas, Kafka, Temporal), and new platform capabilities
• Lead code reviews, technical discussions, and knowledge-sharing sessions within the team
• Mentor and be mentored by other engineers and contribute to a strong engineering culture rooted in the team’s values
• Support production systems through on-call rotations and incident response
• Invest in system health — improving test coverage, addressing technical debt, and continuously improving operational processes (Kaizen)

Required Skills & Experience

• 5+ years of professional software engineering experience
• Strong proficiency in Node.js/TypeScript and/or Go
• Experience with real-time systems — WebSocket, event-driven architectures, or similar
• Solid understanding and hands-on experience with complex cloud infrastructure, ideally GCP and/or AWS
• Experience with microservices architecture and distributed systems, including state management across replicas (e.g. ETCD, Redis)
• Working knowledge of MongoDB or similar document databases
• Experience building and maintaining RESTful APIs and event-driven architectures (ideally Kafka specifically)
• Strong system design fundamentals — can reason about scalability, latency, failover, and trade-offs

• Excellent communication skills and comfort working in a distributed, cross-functional team (CET timezone alignment preferred)

Preferred / Nice-to-Have

• Experience with conversational AI, chatbot or voicebot platforms, or NLP/NLU pipelines
• Experience with containerisation and orchestration (Docker, Kubernetes)
• Familiarity with identity management systems (OAuth/OIDC)
• Prior experience in a CPaaS, scale-up, or fast-growth product company

Our corporate language is English; please submit your application in English.

The  salary for this position is for:

•  Spain (Annual) : €60.000  - €80.000
• Sweden (monthly): 60.000 SEK - 75.000 SEK. 
• Factors which may affect pay within this range may include skills, education, experience, and other qualifications

OUR HIRING PROCESS 

We are committed to ensuring a recruitment process that is fair, objective, consistent, and inclusive. Our approach includes structured, competency-based interviews designed to evaluate your skills, experience, and qualifications relevant to the role. At times, we may include a data-driven assessment to enhance our hiring success and identify candidates likely to excel. 

We believe in a two-way process and encourage you to ask questions throughout the journey. If this role isn’t what you’re looking for, please explore the other opportunities listed on our career page: https://www.sinch.com/careers/. No matter who you are, we hope you find an exciting path forward — hopefully with us! 

ed on our career page: https://www.sinch.com/careers/. No matter

ed on our career page: https://www.sinch.com/careers/. No matter
who you are, we hope you find an exciting path forward — hopefully with us