Tianeptine is not a serotonin releaser or MAOI, so there's no reason the two should interact. Even if tianeptine was primarily a SRE (Serotonin Reuptake Enhancer)... it would
decrease postsynaptic serotonin concentrations, the opposite of what a SSRI does.
There's a case report of someone who
dropped dead in the street with ~10x the normal therapeutic dose of tramadol and tianeptine in her blood. I'm not sure if it's really relevant but it goes to show that the combination is not as threatening as a MAOI+SSRI would be.